elation-engine
Version:
WebGL/WebVR engine written in Javascript
2,043 lines (1,248 loc) • 213 kB
JavaScript
( function () {
function computeTangents() {
throw new Error( 'BufferGeometryUtils: computeTangents renamed to computeMikkTSpaceTangents.' );
}
function computeMikkTSpaceTangents( geometry, MikkTSpace, negateSign = true ) {
if ( ! MikkTSpace || ! MikkTSpace.isReady ) {
throw new Error( 'BufferGeometryUtils: Initialized MikkTSpace library required.' );
}
if ( ! geometry.hasAttribute( 'position' ) || ! geometry.hasAttribute( 'normal' ) || ! geometry.hasAttribute( 'uv' ) ) {
throw new Error( 'BufferGeometryUtils: Tangents require "position", "normal", and "uv" attributes.' );
}
function getAttributeArray( attribute ) {
if ( attribute.normalized || attribute.isInterleavedBufferAttribute ) {
const srcArray = attribute.isInterleavedBufferAttribute ? attribute.data.array : attribute.array;
const dstArray = new Float32Array( attribute.getCount() * attribute.itemSize );
for ( let i = 0, j = 0; i < attribute.getCount(); i ++ ) {
dstArray[ j ++ ] = THREE.MathUtils.denormalize( attribute.getX( i ), srcArray );
dstArray[ j ++ ] = THREE.MathUtils.denormalize( attribute.getY( i ), srcArray );
if ( attribute.itemSize > 2 ) {
dstArray[ j ++ ] = THREE.MathUtils.denormalize( attribute.getZ( i ), srcArray );
}
}
return dstArray;
}
if ( attribute.array instanceof Float32Array ) {
return attribute.array;
}
return new Float32Array( attribute.array );
} // MikkTSpace algorithm requires non-indexed input.
const _geometry = geometry.index ? geometry.toNonIndexed() : geometry; // Compute vertex tangents.
const tangents = MikkTSpace.generateTangents( getAttributeArray( _geometry.attributes.position ), getAttributeArray( _geometry.attributes.normal ), getAttributeArray( _geometry.attributes.uv ) ); // Texture coordinate convention of glTF differs from the apparent
// default of the MikkTSpace library; .w component must be flipped.
if ( negateSign ) {
for ( let i = 3; i < tangents.length; i += 4 ) {
tangents[ i ] *= - 1;
}
} //
_geometry.setAttribute( 'tangent', new THREE.BufferAttribute( tangents, 4 ) );
if ( geometry !== _geometry ) {
geometry.copy( _geometry );
}
return geometry;
}
/**
* @param {Array<BufferGeometry>} geometries
* @param {Boolean} useGroups
* @return {BufferGeometry}
*/
function mergeBufferGeometries( geometries, useGroups = false ) {
const isIndexed = geometries[ 0 ].index !== null;
const attributesUsed = new Set( Object.keys( geometries[ 0 ].attributes ) );
const morphAttributesUsed = new Set( Object.keys( geometries[ 0 ].morphAttributes ) );
const attributes = {};
const morphAttributes = {};
const morphTargetsRelative = geometries[ 0 ].morphTargetsRelative;
const mergedGeometry = new THREE.BufferGeometry();
let offset = 0;
for ( let i = 0; i < geometries.length; ++ i ) {
const geometry = geometries[ i ];
let attributesCount = 0; // ensure that all geometries are indexed, or none
if ( isIndexed !== ( geometry.index !== null ) ) {
console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' + i + '. All geometries must have compatible attributes; make sure index attribute exists among all geometries, or in none of them.' );
return null;
} // gather attributes, exit early if they're different
for ( const name in geometry.attributes ) {
if ( ! attributesUsed.has( name ) ) {
console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' + i + '. All geometries must have compatible attributes; make sure "' + name + '" attribute exists among all geometries, or in none of them.' );
return null;
}
if ( attributes[ name ] === undefined ) attributes[ name ] = [];
attributes[ name ].push( geometry.attributes[ name ] );
attributesCount ++;
} // ensure geometries have the same number of attributes
if ( attributesCount !== attributesUsed.size ) {
console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' + i + '. Make sure all geometries have the same number of attributes.' );
return null;
} // gather morph attributes, exit early if they're different
if ( morphTargetsRelative !== geometry.morphTargetsRelative ) {
console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' + i + '. .morphTargetsRelative must be consistent throughout all geometries.' );
return null;
}
for ( const name in geometry.morphAttributes ) {
if ( ! morphAttributesUsed.has( name ) ) {
console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' + i + '. .morphAttributes must be consistent throughout all geometries.' );
return null;
}
if ( morphAttributes[ name ] === undefined ) morphAttributes[ name ] = [];
morphAttributes[ name ].push( geometry.morphAttributes[ name ] );
} // gather .userData
mergedGeometry.userData.mergedUserData = mergedGeometry.userData.mergedUserData || [];
mergedGeometry.userData.mergedUserData.push( geometry.userData );
if ( useGroups ) {
let count;
if ( isIndexed ) {
count = geometry.index.count;
} else if ( geometry.attributes.position !== undefined ) {
count = geometry.attributes.position.count;
} else {
console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed with geometry at index ' + i + '. The geometry must have either an index or a position attribute' );
return null;
}
mergedGeometry.addGroup( offset, count, i );
offset += count;
}
} // merge indices
if ( isIndexed ) {
let indexOffset = 0;
const mergedIndex = [];
for ( let i = 0; i < geometries.length; ++ i ) {
const index = geometries[ i ].index;
for ( let j = 0; j < index.count; ++ j ) {
mergedIndex.push( index.getX( j ) + indexOffset );
}
indexOffset += geometries[ i ].attributes.position.count;
}
mergedGeometry.setIndex( mergedIndex );
} // merge attributes
for ( const name in attributes ) {
const mergedAttribute = mergeBufferAttributes( attributes[ name ] );
if ( ! mergedAttribute ) {
console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed while trying to merge the ' + name + ' attribute.' );
return null;
}
mergedGeometry.setAttribute( name, mergedAttribute );
} // merge morph attributes
for ( const name in morphAttributes ) {
const numMorphTargets = morphAttributes[ name ][ 0 ].length;
if ( numMorphTargets === 0 ) break;
mergedGeometry.morphAttributes = mergedGeometry.morphAttributes || {};
mergedGeometry.morphAttributes[ name ] = [];
for ( let i = 0; i < numMorphTargets; ++ i ) {
const morphAttributesToMerge = [];
for ( let j = 0; j < morphAttributes[ name ].length; ++ j ) {
morphAttributesToMerge.push( morphAttributes[ name ][ j ][ i ] );
}
const mergedMorphAttribute = mergeBufferAttributes( morphAttributesToMerge );
if ( ! mergedMorphAttribute ) {
console.error( 'THREE.BufferGeometryUtils: .mergeBufferGeometries() failed while trying to merge the ' + name + ' morphAttribute.' );
return null;
}
mergedGeometry.morphAttributes[ name ].push( mergedMorphAttribute );
}
}
return mergedGeometry;
}
/**
* @param {Array<BufferAttribute>} attributes
* @return {BufferAttribute}
*/
function mergeBufferAttributes( attributes ) {
let TypedArray;
let itemSize;
let normalized;
let arrayLength = 0;
for ( let i = 0; i < attributes.length; ++ i ) {
const attribute = attributes[ i ];
if ( attribute.isInterleavedBufferAttribute ) {
console.error( 'THREE.BufferGeometryUtils: .mergeBufferAttributes() failed. InterleavedBufferAttributes are not supported.' );
return null;
}
if ( TypedArray === undefined ) TypedArray = attribute.array.constructor;
if ( TypedArray !== attribute.array.constructor ) {
console.error( 'THREE.BufferGeometryUtils: .mergeBufferAttributes() failed. THREE.BufferAttribute.array must be of consistent array types across matching attributes.' );
return null;
}
if ( itemSize === undefined ) itemSize = attribute.itemSize;
if ( itemSize !== attribute.itemSize ) {
console.error( 'THREE.BufferGeometryUtils: .mergeBufferAttributes() failed. THREE.BufferAttribute.itemSize must be consistent across matching attributes.' );
return null;
}
if ( normalized === undefined ) normalized = attribute.normalized;
if ( normalized !== attribute.normalized ) {
console.error( 'THREE.BufferGeometryUtils: .mergeBufferAttributes() failed. THREE.BufferAttribute.normalized must be consistent across matching attributes.' );
return null;
}
arrayLength += attribute.array.length;
}
const array = new TypedArray( arrayLength );
let offset = 0;
for ( let i = 0; i < attributes.length; ++ i ) {
array.set( attributes[ i ].array, offset );
offset += attributes[ i ].array.length;
}
return new THREE.BufferAttribute( array, itemSize, normalized );
}
/**
* @param {Array<BufferAttribute>} attributes
* @return {Array<InterleavedBufferAttribute>}
*/
function interleaveAttributes( attributes ) {
// Interleaves the provided attributes into an THREE.InterleavedBuffer and returns
// a set of InterleavedBufferAttributes for each attribute
let TypedArray;
let arrayLength = 0;
let stride = 0; // calculate the the length and type of the interleavedBuffer
for ( let i = 0, l = attributes.length; i < l; ++ i ) {
const attribute = attributes[ i ];
if ( TypedArray === undefined ) TypedArray = attribute.array.constructor;
if ( TypedArray !== attribute.array.constructor ) {
console.error( 'AttributeBuffers of different types cannot be interleaved' );
return null;
}
arrayLength += attribute.array.length;
stride += attribute.itemSize;
} // Create the set of buffer attributes
const interleavedBuffer = new THREE.InterleavedBuffer( new TypedArray( arrayLength ), stride );
let offset = 0;
const res = [];
const getters = [ 'getX', 'getY', 'getZ', 'getW' ];
const setters = [ 'setX', 'setY', 'setZ', 'setW' ];
for ( let j = 0, l = attributes.length; j < l; j ++ ) {
const attribute = attributes[ j ];
const itemSize = attribute.itemSize;
const count = attribute.count;
const iba = new THREE.InterleavedBufferAttribute( interleavedBuffer, itemSize, offset, attribute.normalized );
res.push( iba );
offset += itemSize; // Move the data for each attribute into the new interleavedBuffer
// at the appropriate offset
for ( let c = 0; c < count; c ++ ) {
for ( let k = 0; k < itemSize; k ++ ) {
iba[ setters[ k ] ]( c, attribute[ getters[ k ] ]( c ) );
}
}
}
return res;
} // returns a new, non-interleaved version of the provided attribute
function deinterleaveAttribute( attribute ) {
const cons = attribute.data.array.constructor;
const count = attribute.count;
const itemSize = attribute.itemSize;
const normalized = attribute.normalized;
const array = new cons( count * itemSize );
let newAttribute;
if ( attribute.isInstancedInterleavedBufferAttribute ) {
newAttribute = new InstancedBufferAttribute( array, itemSize, normalized, attribute.meshPerAttribute );
} else {
newAttribute = new THREE.BufferAttribute( array, itemSize, normalized );
}
for ( let i = 0; i < count; i ++ ) {
newAttribute.setX( i, attribute.getX( i ) );
if ( itemSize >= 2 ) {
newAttribute.setY( i, attribute.getY( i ) );
}
if ( itemSize >= 3 ) {
newAttribute.setZ( i, attribute.getZ( i ) );
}
if ( itemSize >= 4 ) {
newAttribute.setW( i, attribute.getW( i ) );
}
}
return newAttribute;
} // deinterleaves all attributes on the geometry
function deinterleaveGeometry( geometry ) {
const attributes = geometry.attributes;
const morphTargets = geometry.morphTargets;
const attrMap = new Map();
for ( const key in attributes ) {
const attr = attributes[ key ];
if ( attr.isInterleavedBufferAttribute ) {
if ( ! attrMap.has( attr ) ) {
attrMap.set( attr, deinterleaveAttribute( attr ) );
}
attributes[ key ] = attrMap.get( attr );
}
}
for ( const key in morphTargets ) {
const attr = morphTargets[ key ];
if ( attr.isInterleavedBufferAttribute ) {
if ( ! attrMap.has( attr ) ) {
attrMap.set( attr, deinterleaveAttribute( attr ) );
}
morphTargets[ key ] = attrMap.get( attr );
}
}
}
/**
* @param {Array<BufferGeometry>} geometry
* @return {number}
*/
function estimateBytesUsed( geometry ) {
// Return the estimated memory used by this geometry in bytes
// Calculate using itemSize, count, and BYTES_PER_ELEMENT to account
// for InterleavedBufferAttributes.
let mem = 0;
for ( const name in geometry.attributes ) {
const attr = geometry.getAttribute( name );
mem += attr.count * attr.itemSize * attr.array.BYTES_PER_ELEMENT;
}
const indices = geometry.getIndex();
mem += indices ? indices.count * indices.itemSize * indices.array.BYTES_PER_ELEMENT : 0;
return mem;
}
/**
* @param {BufferGeometry} geometry
* @param {number} tolerance
* @return {BufferGeometry>}
*/
function mergeVertices( geometry, tolerance = 1e-4 ) {
tolerance = Math.max( tolerance, Number.EPSILON ); // Generate an index buffer if the geometry doesn't have one, or optimize it
// if it's already available.
const hashToIndex = {};
const indices = geometry.getIndex();
const positions = geometry.getAttribute( 'position' );
const vertexCount = indices ? indices.count : positions.count; // next value for triangle indices
let nextIndex = 0; // attributes and new attribute arrays
const attributeNames = Object.keys( geometry.attributes );
const attrArrays = {};
const morphAttrsArrays = {};
const newIndices = [];
const getters = [ 'getX', 'getY', 'getZ', 'getW' ]; // initialize the arrays
for ( let i = 0, l = attributeNames.length; i < l; i ++ ) {
const name = attributeNames[ i ];
attrArrays[ name ] = [];
const morphAttr = geometry.morphAttributes[ name ];
if ( morphAttr ) {
morphAttrsArrays[ name ] = new Array( morphAttr.length ).fill().map( () => [] );
}
} // convert the error tolerance to an amount of decimal places to truncate to
const decimalShift = Math.log10( 1 / tolerance );
const shiftMultiplier = Math.pow( 10, decimalShift );
for ( let i = 0; i < vertexCount; i ++ ) {
const index = indices ? indices.getX( i ) : i; // Generate a hash for the vertex attributes at the current index 'i'
let hash = '';
for ( let j = 0, l = attributeNames.length; j < l; j ++ ) {
const name = attributeNames[ j ];
const attribute = geometry.getAttribute( name );
const itemSize = attribute.itemSize;
for ( let k = 0; k < itemSize; k ++ ) {
// double tilde truncates the decimal value
hash += `${~ ~ ( attribute[ getters[ k ] ]( index ) * shiftMultiplier )},`;
}
} // Add another reference to the vertex if it's already
// used by another index
if ( hash in hashToIndex ) {
newIndices.push( hashToIndex[ hash ] );
} else {
// copy data to the new index in the attribute arrays
for ( let j = 0, l = attributeNames.length; j < l; j ++ ) {
const name = attributeNames[ j ];
const attribute = geometry.getAttribute( name );
const morphAttr = geometry.morphAttributes[ name ];
const itemSize = attribute.itemSize;
const newarray = attrArrays[ name ];
const newMorphArrays = morphAttrsArrays[ name ];
for ( let k = 0; k < itemSize; k ++ ) {
const getterFunc = getters[ k ];
newarray.push( attribute[ getterFunc ]( index ) );
if ( morphAttr ) {
for ( let m = 0, ml = morphAttr.length; m < ml; m ++ ) {
newMorphArrays[ m ].push( morphAttr[ m ][ getterFunc ]( index ) );
}
}
}
}
hashToIndex[ hash ] = nextIndex;
newIndices.push( nextIndex );
nextIndex ++;
}
} // Generate typed arrays from new attribute arrays and update
// the attributeBuffers
const result = geometry.clone();
for ( let i = 0, l = attributeNames.length; i < l; i ++ ) {
const name = attributeNames[ i ];
const oldAttribute = geometry.getAttribute( name );
const buffer = new oldAttribute.array.constructor( attrArrays[ name ] );
const attribute = new THREE.BufferAttribute( buffer, oldAttribute.itemSize, oldAttribute.normalized );
result.setAttribute( name, attribute ); // Update the attribute arrays
if ( name in morphAttrsArrays ) {
for ( let j = 0; j < morphAttrsArrays[ name ].length; j ++ ) {
const oldMorphAttribute = geometry.morphAttributes[ name ][ j ];
const buffer = new oldMorphAttribute.array.constructor( morphAttrsArrays[ name ][ j ] );
const morphAttribute = new THREE.BufferAttribute( buffer, oldMorphAttribute.itemSize, oldMorphAttribute.normalized );
result.morphAttributes[ name ][ j ] = morphAttribute;
}
}
} // indices
result.setIndex( newIndices );
return result;
}
/**
* @param {BufferGeometry} geometry
* @param {number} drawMode
* @return {BufferGeometry>}
*/
function toTrianglesDrawMode( geometry, drawMode ) {
if ( drawMode === THREE.TrianglesDrawMode ) {
console.warn( 'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Geometry already defined as triangles.' );
return geometry;
}
if ( drawMode === THREE.TriangleFanDrawMode || drawMode === THREE.TriangleStripDrawMode ) {
let index = geometry.getIndex(); // generate index if not present
if ( index === null ) {
const indices = [];
const position = geometry.getAttribute( 'position' );
if ( position !== undefined ) {
for ( let i = 0; i < position.count; i ++ ) {
indices.push( i );
}
geometry.setIndex( indices );
index = geometry.getIndex();
} else {
console.error( 'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Undefined position attribute. Processing not possible.' );
return geometry;
}
} //
const numberOfTriangles = index.count - 2;
const newIndices = [];
if ( drawMode === THREE.TriangleFanDrawMode ) {
// gl.TRIANGLE_FAN
for ( let i = 1; i <= numberOfTriangles; i ++ ) {
newIndices.push( index.getX( 0 ) );
newIndices.push( index.getX( i ) );
newIndices.push( index.getX( i + 1 ) );
}
} else {
// gl.TRIANGLE_STRIP
for ( let i = 0; i < numberOfTriangles; i ++ ) {
if ( i % 2 === 0 ) {
newIndices.push( index.getX( i ) );
newIndices.push( index.getX( i + 1 ) );
newIndices.push( index.getX( i + 2 ) );
} else {
newIndices.push( index.getX( i + 2 ) );
newIndices.push( index.getX( i + 1 ) );
newIndices.push( index.getX( i ) );
}
}
}
if ( newIndices.length / 3 !== numberOfTriangles ) {
console.error( 'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Unable to generate correct amount of triangles.' );
} // build final geometry
const newGeometry = geometry.clone();
newGeometry.setIndex( newIndices );
newGeometry.clearGroups();
return newGeometry;
} else {
console.error( 'THREE.BufferGeometryUtils.toTrianglesDrawMode(): Unknown draw mode:', drawMode );
return geometry;
}
}
/**
* Calculates the morphed attributes of a morphed/skinned THREE.BufferGeometry.
* Helpful for Raytracing or Decals.
* @param {Mesh | Line | Points} object An instance of Mesh, Line or Points.
* @return {Object} An Object with original position/normal attributes and morphed ones.
*/
function computeMorphedAttributes( object ) {
if ( object.geometry.isBufferGeometry !== true ) {
console.error( 'THREE.BufferGeometryUtils: Geometry is not of type THREE.BufferGeometry.' );
return null;
}
const _vA = new THREE.Vector3();
const _vB = new THREE.Vector3();
const _vC = new THREE.Vector3();
const _tempA = new THREE.Vector3();
const _tempB = new THREE.Vector3();
const _tempC = new THREE.Vector3();
const _morphA = new THREE.Vector3();
const _morphB = new THREE.Vector3();
const _morphC = new THREE.Vector3();
function _calculateMorphedAttributeData( object, attribute, morphAttribute, morphTargetsRelative, a, b, c, modifiedAttributeArray ) {
_vA.fromBufferAttribute( attribute, a );
_vB.fromBufferAttribute( attribute, b );
_vC.fromBufferAttribute( attribute, c );
const morphInfluences = object.morphTargetInfluences;
if ( morphAttribute && morphInfluences ) {
_morphA.set( 0, 0, 0 );
_morphB.set( 0, 0, 0 );
_morphC.set( 0, 0, 0 );
for ( let i = 0, il = morphAttribute.length; i < il; i ++ ) {
const influence = morphInfluences[ i ];
const morph = morphAttribute[ i ];
if ( influence === 0 ) continue;
_tempA.fromBufferAttribute( morph, a );
_tempB.fromBufferAttribute( morph, b );
_tempC.fromBufferAttribute( morph, c );
if ( morphTargetsRelative ) {
_morphA.addScaledVector( _tempA, influence );
_morphB.addScaledVector( _tempB, influence );
_morphC.addScaledVector( _tempC, influence );
} else {
_morphA.addScaledVector( _tempA.sub( _vA ), influence );
_morphB.addScaledVector( _tempB.sub( _vB ), influence );
_morphC.addScaledVector( _tempC.sub( _vC ), influence );
}
}
_vA.add( _morphA );
_vB.add( _morphB );
_vC.add( _morphC );
}
if ( object.isSkinnedMesh ) {
object.boneTransform( a, _vA );
object.boneTransform( b, _vB );
object.boneTransform( c, _vC );
}
modifiedAttributeArray[ a * 3 + 0 ] = _vA.x;
modifiedAttributeArray[ a * 3 + 1 ] = _vA.y;
modifiedAttributeArray[ a * 3 + 2 ] = _vA.z;
modifiedAttributeArray[ b * 3 + 0 ] = _vB.x;
modifiedAttributeArray[ b * 3 + 1 ] = _vB.y;
modifiedAttributeArray[ b * 3 + 2 ] = _vB.z;
modifiedAttributeArray[ c * 3 + 0 ] = _vC.x;
modifiedAttributeArray[ c * 3 + 1 ] = _vC.y;
modifiedAttributeArray[ c * 3 + 2 ] = _vC.z;
}
const geometry = object.geometry;
const material = object.material;
let a, b, c;
const index = geometry.index;
const positionAttribute = geometry.attributes.position;
const morphPosition = geometry.morphAttributes.position;
const morphTargetsRelative = geometry.morphTargetsRelative;
const normalAttribute = geometry.attributes.normal;
const morphNormal = geometry.morphAttributes.position;
const groups = geometry.groups;
const drawRange = geometry.drawRange;
let i, j, il, jl;
let group;
let start, end;
const modifiedPosition = new Float32Array( positionAttribute.count * positionAttribute.itemSize );
const modifiedNormal = new Float32Array( normalAttribute.count * normalAttribute.itemSize );
if ( index !== null ) {
// indexed buffer geometry
if ( Array.isArray( material ) ) {
for ( i = 0, il = groups.length; i < il; i ++ ) {
group = groups[ i ];
start = Math.max( group.start, drawRange.start );
end = Math.min( group.start + group.count, drawRange.start + drawRange.count );
for ( j = start, jl = end; j < jl; j += 3 ) {
a = index.getX( j );
b = index.getX( j + 1 );
c = index.getX( j + 2 );
_calculateMorphedAttributeData( object, positionAttribute, morphPosition, morphTargetsRelative, a, b, c, modifiedPosition );
_calculateMorphedAttributeData( object, normalAttribute, morphNormal, morphTargetsRelative, a, b, c, modifiedNormal );
}
}
} else {
start = Math.max( 0, drawRange.start );
end = Math.min( index.count, drawRange.start + drawRange.count );
for ( i = start, il = end; i < il; i += 3 ) {
a = index.getX( i );
b = index.getX( i + 1 );
c = index.getX( i + 2 );
_calculateMorphedAttributeData( object, positionAttribute, morphPosition, morphTargetsRelative, a, b, c, modifiedPosition );
_calculateMorphedAttributeData( object, normalAttribute, morphNormal, morphTargetsRelative, a, b, c, modifiedNormal );
}
}
} else {
// non-indexed buffer geometry
if ( Array.isArray( material ) ) {
for ( i = 0, il = groups.length; i < il; i ++ ) {
group = groups[ i ];
start = Math.max( group.start, drawRange.start );
end = Math.min( group.start + group.count, drawRange.start + drawRange.count );
for ( j = start, jl = end; j < jl; j += 3 ) {
a = j;
b = j + 1;
c = j + 2;
_calculateMorphedAttributeData( object, positionAttribute, morphPosition, morphTargetsRelative, a, b, c, modifiedPosition );
_calculateMorphedAttributeData( object, normalAttribute, morphNormal, morphTargetsRelative, a, b, c, modifiedNormal );
}
}
} else {
start = Math.max( 0, drawRange.start );
end = Math.min( positionAttribute.count, drawRange.start + drawRange.count );
for ( i = start, il = end; i < il; i += 3 ) {
a = i;
b = i + 1;
c = i + 2;
_calculateMorphedAttributeData( object, positionAttribute, morphPosition, morphTargetsRelative, a, b, c, modifiedPosition );
_calculateMorphedAttributeData( object, normalAttribute, morphNormal, morphTargetsRelative, a, b, c, modifiedNormal );
}
}
}
const morphedPositionAttribute = new THREE.Float32BufferAttribute( modifiedPosition, 3 );
const morphedNormalAttribute = new THREE.Float32BufferAttribute( modifiedNormal, 3 );
return {
positionAttribute: positionAttribute,
normalAttribute: normalAttribute,
morphedPositionAttribute: morphedPositionAttribute,
morphedNormalAttribute: morphedNormalAttribute
};
}
function mergeGroups( geometry ) {
if ( geometry.groups.length === 0 ) {
console.warn( 'THREE.BufferGeometryUtils.mergeGroups(): No groups are defined. Nothing to merge.' );
return geometry;
}
let groups = geometry.groups; // sort groups by material index
groups = groups.sort( ( a, b ) => {
if ( a.materialIndex !== b.materialIndex ) return a.materialIndex - b.materialIndex;
return a.start - b.start;
} ); // create index for non-indexed geometries
if ( geometry.getIndex() === null ) {
const positionAttribute = geometry.getAttribute( 'position' );
const indices = [];
for ( let i = 0; i < positionAttribute.count; i += 3 ) {
indices.push( i, i + 1, i + 2 );
}
geometry.setIndex( indices );
} // sort index
const index = geometry.getIndex();
const newIndices = [];
for ( let i = 0; i < groups.length; i ++ ) {
const group = groups[ i ];
const groupStart = group.start;
const groupLength = groupStart + group.count;
for ( let j = groupStart; j < groupLength; j ++ ) {
newIndices.push( index.getX( j ) );
}
}
geometry.dispose(); // Required to force buffer recreation
geometry.setIndex( newIndices ); // update groups indices
let start = 0;
for ( let i = 0; i < groups.length; i ++ ) {
const group = groups[ i ];
group.start = start;
start += group.count;
} // merge groups
let currentGroup = groups[ 0 ];
geometry.groups = [ currentGroup ];
for ( let i = 1; i < groups.length; i ++ ) {
const group = groups[ i ];
if ( currentGroup.materialIndex === group.materialIndex ) {
currentGroup.count += group.count;
} else {
currentGroup = group;
geometry.groups.push( currentGroup );
}
}
return geometry;
}
THREE.BufferGeometryUtils = {};
THREE.BufferGeometryUtils.computeMikkTSpaceTangents = computeMikkTSpaceTangents;
THREE.BufferGeometryUtils.computeMorphedAttributes = computeMorphedAttributes;
THREE.BufferGeometryUtils.computeTangents = computeTangents;
THREE.BufferGeometryUtils.deinterleaveAttribute = deinterleaveAttribute;
THREE.BufferGeometryUtils.deinterleaveGeometry = deinterleaveGeometry;
THREE.BufferGeometryUtils.estimateBytesUsed = estimateBytesUsed;
THREE.BufferGeometryUtils.interleaveAttributes = interleaveAttributes;
THREE.BufferGeometryUtils.mergeBufferAttributes = mergeBufferAttributes;
THREE.BufferGeometryUtils.mergeBufferGeometries = mergeBufferGeometries;
THREE.BufferGeometryUtils.mergeGroups = mergeGroups;
THREE.BufferGeometryUtils.mergeVertices = mergeVertices;
THREE.BufferGeometryUtils.toTrianglesDrawMode = toTrianglesDrawMode;
} )();
/**
* @author fernandojsg / http://fernandojsg.com
* @author Don McCurdy / https://www.donmccurdy.com
* @author Takahiro / https://github.com/takahirox
*/
//------------------------------------------------------------------------------
// Constants
//------------------------------------------------------------------------------
var WEBGL_CONSTANTS = {
POINTS: 0x0000,
LINES: 0x0001,
LINE_LOOP: 0x0002,
LINE_STRIP: 0x0003,
TRIANGLES: 0x0004,
TRIANGLE_STRIP: 0x0005,
TRIANGLE_FAN: 0x0006,
UNSIGNED_BYTE: 0x1401,
UNSIGNED_SHORT: 0x1403,
FLOAT: 0x1406,
UNSIGNED_INT: 0x1405,
ARRAY_BUFFER: 0x8892,
ELEMENT_ARRAY_BUFFER: 0x8893,
NEAREST: 0x2600,
LINEAR: 0x2601,
NEAREST_MIPMAP_NEAREST: 0x2700,
LINEAR_MIPMAP_NEAREST: 0x2701,
NEAREST_MIPMAP_LINEAR: 0x2702,
LINEAR_MIPMAP_LINEAR: 0x2703,
CLAMP_TO_EDGE: 33071,
MIRRORED_REPEAT: 33648,
REPEAT: 10497
};
var THREE_TO_WEBGL = {};
THREE_TO_WEBGL[ THREE.NearestFilter ] = WEBGL_CONSTANTS.NEAREST;
THREE_TO_WEBGL[ THREE.NearestMipmapNearestFilter ] = WEBGL_CONSTANTS.NEAREST_MIPMAP_NEAREST;
THREE_TO_WEBGL[ THREE.NearestMipmapLinearFilter ] = WEBGL_CONSTANTS.NEAREST_MIPMAP_LINEAR;
THREE_TO_WEBGL[ THREE.LinearFilter ] = WEBGL_CONSTANTS.LINEAR;
THREE_TO_WEBGL[ THREE.LinearMipmapNearestFilter ] = WEBGL_CONSTANTS.LINEAR_MIPMAP_NEAREST;
THREE_TO_WEBGL[ THREE.LinearMipmapLinearFilter ] = WEBGL_CONSTANTS.LINEAR_MIPMAP_LINEAR;
THREE_TO_WEBGL[ THREE.ClampToEdgeWrapping ] = WEBGL_CONSTANTS.CLAMP_TO_EDGE;
THREE_TO_WEBGL[ THREE.RepeatWrapping ] = WEBGL_CONSTANTS.REPEAT;
THREE_TO_WEBGL[ THREE.MirroredRepeatWrapping ] = WEBGL_CONSTANTS.MIRRORED_REPEAT;
var PATH_PROPERTIES = {
scale: 'scale',
position: 'translation',
quaternion: 'rotation',
morphTargetInfluences: 'weights'
};
//------------------------------------------------------------------------------
// GLTF Exporter
//------------------------------------------------------------------------------
THREE.GLTFExporter = function () {};
THREE.GLTFExporter.prototype = {
constructor: THREE.GLTFExporter,
/**
* Parse scenes and generate GLTF output
* @param {THREE.Scene or [THREE.Scenes]} input THREE.Scene or Array of THREE.Scenes
* @param {Function} onDone Callback on completed
* @param {Object} options options
*/
parse: function ( input, onDone, options ) {
var DEFAULT_OPTIONS = {
binary: false,
trs: false,
onlyVisible: true,
truncateDrawRange: true,
embedImages: true,
maxTextureSize: Infinity,
animations: [],
forceIndices: false,
forcePowerOfTwoTextures: false,
includeCustomExtensions: false
};
options = Object.assign( {}, DEFAULT_OPTIONS, options );
if ( options.animations.length > 0 ) {
// Only TRS properties, and not matrices, may be targeted by animation.
options.trs = true;
}
var outputJSON = {
asset: {
version: "2.0",
generator: "THREE.GLTFExporter"
}
};
var byteOffset = 0;
var buffers = [];
var pending = [];
var nodeMap = new Map();
var skins = [];
var extensionsUsed = {};
var cachedData = {
meshes: new Map(),
attributes: new Map(),
attributesNormalized: new Map(),
materials: new Map(),
textures: new Map(),
images: new Map()
};
var cachedCanvas;
var uids = new Map();
var uid = 0;
/**
* Assign and return a temporal unique id for an object
* especially which doesn't have .uuid
* @param {Object} object
* @return {Integer}
*/
function getUID( object ) {
if ( ! uids.has( object ) ) uids.set( object, uid ++ );
return uids.get( object );
}
/**
* Compare two arrays
* @param {Array} array1 Array 1 to compare
* @param {Array} array2 Array 2 to compare
* @return {Boolean} Returns true if both arrays are equal
*/
function equalArray( array1, array2 ) {
return ( array1.length === array2.length ) && array1.every( function ( element, index ) {
return element === array2[ index ];
} );
}
/**
* Converts a string to an ArrayBuffer.
* @param {string} text
* @return {ArrayBuffer}
*/
function stringToArrayBuffer( text ) {
if ( window.TextEncoder !== undefined ) {
return new TextEncoder().encode( text ).buffer;
}
var array = new Uint8Array( new ArrayBuffer( text.length ) );
for ( var i = 0, il = text.length; i < il; i ++ ) {
var value = text.charCodeAt( i );
// Replacing multi-byte character with space(0x20).
array[ i ] = value > 0xFF ? 0x20 : value;
}
return array.buffer;
}
/**
* Get the min and max vectors from the given attribute
* @param {THREE.BufferAttribute} attribute Attribute to find the min/max in range from start to start + count
* @param {Integer} start
* @param {Integer} count
* @return {Object} Object containing the `min` and `max` values (As an array of attribute.itemSize components)
*/
function getMinMax( attribute, start, count ) {
var output = {
min: new Array( attribute.itemSize ).fill( Number.POSITIVE_INFINITY ),
max: new Array( attribute.itemSize ).fill( Number.NEGATIVE_INFINITY )
};
for ( var i = start; i < start + count; i ++ ) {
for ( var a = 0; a < attribute.itemSize; a ++ ) {
var value = attribute.array[ i * attribute.itemSize + a ];
output.min[ a ] = Math.min( output.min[ a ], value );
output.max[ a ] = Math.max( output.max[ a ], value );
}
}
return output;
}
/**
* Checks if image size is POT.
*
* @param {Image} image The image to be checked.
* @returns {Boolean} Returns true if image size is POT.
*
*/
function isPowerOfTwo( image ) {
return THREE.MathUtils.isPowerOfTwo( image.width ) && THREE.MathUtils.isPowerOfTwo( image.height );
}
/**
* Checks if normal attribute values are normalized.
*
* @param {THREE.BufferAttribute} normal
* @returns {Boolean}
*
*/
function isNormalizedNormalAttribute( normal ) {
if ( cachedData.attributesNormalized.has( normal ) ) {
return false;
}
var v = new THREE.Vector3();
for ( var i = 0, il = normal.count; i < il; i ++ ) {
// 0.0005 is from glTF-validator
if ( Math.abs( v.fromArray( normal.array, i * 3 ).length() - 1.0 ) > 0.0005 ) return false;
}
return true;
}
/**
* Creates normalized normal buffer attribute.
*
* @param {THREE.BufferAttribute} normal
* @returns {THREE.BufferAttribute}
*
*/
function createNormalizedNormalAttribute( normal ) {
if ( cachedData.attributesNormalized.has( normal ) ) {
return cachedData.attributesNormalized.get( normal );
}
var attribute = normal.clone();
var v = new THREE.Vector3();
for ( var i = 0, il = attribute.count; i < il; i ++ ) {
v.fromArray( attribute.array, i * 3 );
if ( v.x === 0 && v.y === 0 && v.z === 0 ) {
// if values can't be normalized set (1, 0, 0)
v.setX( 1.0 );
} else {
v.normalize();
}
v.toArray( attribute.array, i * 3 );
}
cachedData.attributesNormalized.set( normal, attribute );
return attribute;
}
/**
* Get the required size + padding for a buffer, rounded to the next 4-byte boundary.
* https://github.com/KhronosGroup/glTF/tree/master/specification/2.0#data-alignment
*
* @param {Integer} bufferSize The size the original buffer.
* @returns {Integer} new buffer size with required padding.
*
*/
function getPaddedBufferSize( bufferSize ) {
return Math.ceil( bufferSize / 4 ) * 4;
}
/**
* Returns a buffer aligned to 4-byte boundary.
*
* @param {ArrayBuffer} arrayBuffer Buffer to pad
* @param {Integer} paddingByte (Optional)
* @returns {ArrayBuffer} The same buffer if it's already aligned to 4-byte boundary or a new buffer
*/
function getPaddedArrayBuffer( arrayBuffer, paddingByte ) {
paddingByte = paddingByte || 0;
var paddedLength = getPaddedBufferSize( arrayBuffer.byteLength );
if ( paddedLength !== arrayBuffer.byteLength ) {
var array = new Uint8Array( paddedLength );
array.set( new Uint8Array( arrayBuffer ) );
if ( paddingByte !== 0 ) {
for ( var i = arrayBuffer.byteLength; i < paddedLength; i ++ ) {
array[ i ] = paddingByte;
}
}
return array.buffer;
}
return arrayBuffer;
}
/**
* Serializes a userData.
*
* @param {THREE.Object3D|THREE.Material} object
* @param {Object} gltfProperty
*/
function serializeUserData( object, gltfProperty ) {
if ( Object.keys( object.userData ).length === 0 ) {
return;
}
try {
var json = JSON.parse( JSON.stringify( object.userData ) );
if ( options.includeCustomExtensions && json.gltfExtensions ) {
if ( gltfProperty.extensions === undefined ) {
gltfProperty.extensions = {};
}
for ( var extensionName in json.gltfExtensions ) {
gltfProperty.extensions[ extensionName ] = json.gltfExtensions[ extensionName ];
extensionsUsed[ extensionName ] = true;
}
delete json.gltfExtensions;
}
if ( Object.keys( json ).length > 0 ) {
gltfProperty.extras = json;
}
} catch ( error ) {
console.warn( 'THREE.GLTFExporter: userData of \'' + object.name + '\' ' +
'won\'t be serialized because of JSON.stringify error - ' + error.message );
}
}
/**
* Applies a texture transform, if present, to the map definition. Requires
* the KHR_texture_transform extension.
*/
function applyTextureTransform( mapDef, texture ) {
var didTransform = false;
var transformDef = {};
if ( texture.offset.x !== 0 || texture.offset.y !== 0 ) {
transformDef.offset = texture.offset.toArray();
didTransform = true;
}
if ( texture.rotation !== 0 ) {
transformDef.rotation = texture.rotation;
didTransform = true;
}
if ( texture.repeat.x !== 1 || texture.repeat.y !== 1 ) {
transformDef.scale = texture.repeat.toArray();
didTransform = true;
}
if ( didTransform ) {
mapDef.extensions = mapDef.extensions || {};
mapDef.extensions[ 'KHR_texture_transform' ] = transformDef;
extensionsUsed[ 'KHR_texture_transform' ] = true;
}
}
/**
* Process a buffer to append to the default one.
* @param {ArrayBuffer} buffer
* @return {Integer}
*/
function processBuffer( buffer ) {
if ( ! outputJSON.buffers ) {
outputJSON.buffers = [ { byteLength: 0 } ];
}
// All buffers are merged before export.
buffers.push( buffer );
return 0;
}
/**
* Process and generate a BufferView
* @param {THREE.BufferAttribute} attribute
* @param {number} componentType
* @param {number} start
* @param {number} count
* @param {number} target (Optional) Target usage of the BufferView
* @return {Object}
*/
function processBufferView( attribute, componentType, start, count, target ) {
if ( ! outputJSON.bufferViews ) {
outputJSON.bufferViews = [];
}
// Create a new dataview and dump the attribute's array into it
var componentSize;
if ( componentType === WEBGL_CONSTANTS.UNSIGNED_BYTE ) {
componentSize = 1;
} else if ( componentType === WEBGL_CONSTANTS.UNSIGNED_SHORT ) {
componentSize = 2;
} else {
componentSize = 4;
}
var byteLength = getPaddedBufferSize( count * attribute.itemSize * componentSize );
var dataView = new DataView( new ArrayBuffer( byteLength ) );
var offset = 0;
for ( var i = start; i < start + count; i ++ ) {
for ( var a = 0; a < attribute.itemSize; a ++ ) {
// @TODO Fails on InterleavedBufferAttribute, and could probably be
// optimized for normal BufferAttribute.
var value = attribute.array[ i * attribute.itemSize + a ];
if ( componentType === WEBGL_CONSTANTS.FLOAT ) {
dataView.setFloat32( offset, value, true );
} else if ( componentType === WEBGL_CONSTANTS.UNSIGNED_INT ) {
dataView.setUint32( offset, value, true );
} else if ( componentType === WEBGL_CONSTANTS.UNSIGNED_SHORT ) {
dataView.setUint16( offset, value, true );
} else if ( componentType === WEBGL_CONSTANTS.UNSIGNED_BYTE ) {
dataView.setUint8( offset, value );
}
offset += componentSize;
}
}
var gltfBufferView = {
buffer: processBuffer( dataView.buffer ),
byteOffset: byteOffset,
byteLength: byteLength
};
if ( target !== undefined ) gltfBufferView.target = target;
if ( target === WEBGL_CONSTANTS.ARRAY_BUFFER ) {
// Only define byteStride for vertex attributes.
gltfBufferView.byteStride = attribute.itemSize * componentSize;
}
byteOffset += byteLength;
outputJSON.bufferViews.push( gltfBufferView );
// @TODO Merge bufferViews where possible.
var output = {
id: outputJSON.bufferViews.length - 1,
byteLength: 0
};
return output;
}
/**
* Process and generate a BufferView from an image Blob.
* @param {Blob} blob
* @return {Promise<Integer>}
*/
function processBufferViewImage( blob ) {
if ( ! outputJSON.bufferViews ) {
outputJSON.bufferViews = [];
}
return new Promise( function ( resolve ) {
var reader = new window.FileReader();
reader.readAsArrayBuffer( blob );
reader.onloadend = function () {
var buffer = getPaddedArrayBuffer( reader.result );
var bufferView = {
buffer: processBuffer( buffer ),
byteOffset: byteOffset,
byteLength: buffer.byteLength
};
byteOffset += buffer.byteLength;
outputJSON.bufferViews.push( bufferView );
resolve( outputJSON.bufferViews.length - 1 );
};
} );
}
/**
* Process attribute to generate an accessor
* @param {THREE.BufferAttribute} attribute Attribute to process
* @param {THREE.BufferGeometry} geometry (Optional) Geometry used for truncated draw range
* @param {Integer} start (Optional)
* @param {Integer} count (Optional)
* @return {Integer} Index of the processed accessor on the "accessors" array
*/
function processAccessor( attribute, geometry, start, count ) {
var types = {
1: 'SCALAR',
2: 'VEC2',
3: 'VEC3',
4: 'VEC4',
16: 'MAT4'
};
var componentType;
// Detect the component type of the attribute array (float, uint or ushort)
if ( attribute.array.constructor === Float32Array ) {
componentType = WEBGL_CONSTANTS.FLOAT;
} else if ( attribute.array.constructor === Uint32Array ) {
componentType = WEBGL_CONSTANTS.UNSIGNED_INT;
} else if ( attribute.array.constructor === Uint16Array ) {
componentType = WEBGL_CONSTANTS.UNSIGNED_SHORT;
} else if ( attribute.array.constructor === Uint8Array ) {
componentType = WEBGL_CONSTANTS.UNSIGNED_BYTE;
} else {
throw new Error( 'THREE.GLTFExporter: Unsupported bufferAttribute component type.' );
}
if ( start === undefined ) start = 0;
if ( count === undefined ) count = attribute.count;
// @TODO Indexed buffer geometry with drawRange not supported yet
if ( options.truncateDrawRange && geometry !== undefined && geometry.index === null ) {
var end = start + count;
var end2 = geometry.drawRange.count === Infinity
? attribute.count
: geometry.drawRange.start + geometry.drawRange.count;
start = Math.max( start, geometry.drawRange.start );
count = Math.min( end, end2 ) - start;
if ( count < 0 ) count = 0;
}
// Skip creating an accessor if the attribute doesn't have data to export
if ( count === 0 ) {
return null;
}
var minMax = getMinMax( attribute, start, count );
var bufferViewTarget;
// If geometry isn't provided, don't infer the target usage of the bufferView. For
// animation samplers, target must not be set.
if ( geometry !== undefined ) {
bufferViewTarget = attribute === geometry.index ? WEBGL_CONSTANTS.ELEMENT_ARRAY_BUFFER : WEBGL_CONSTANTS.ARRAY_BUFFER;
}
var bufferView = processBufferView( attribute, componentType, start, count, bufferViewTarget );
var gltfAccessor = {
bufferView: bufferView.id,
byteOffset: bufferView.byteOffset,
componentType: componentType,
count: count,
max: minMax.max,
min: minMax.min,
type: types[ attribute.itemSize ]
};
if ( ! outputJSON.accessors ) {
outputJSON.accessors = [];
}
outputJSON.accessors.push( gltfAccessor );
return outputJSON.accessors.length - 1;
}
/**
* Process image
* @param {Image} image to process
* @param {Integer} format of the image (e.g. THREE.RGBFormat, THREE.RGBAFormat etc)
* @param {Boolean} flipY before writing out the image
* @return {Integer} Index of the processed texture in the "images" array
*/
function processImage( image, format, flipY ) {
if ( ! cachedData.images.has( image ) ) {
cachedData.images.set( image, {} );
}
var cachedImages = cachedData.images.get( image );
var mimeType = format === THREE.RGBAFormat ? 'image/png' : 'image/jpeg';
var key = mimeType + ":flipY/" + flipY.toString();
if ( cachedImages[ key ] !== undefined ) {
return cachedImages[ key ];
}
if ( ! outputJSON.images ) {
outputJSON.images = [];
}
var gltfImage = { mimeType: mimeType };
if ( options.embedImages ) {
var canvas = cachedCanvas = cachedCanvas || document.createElement( 'canvas' );
canvas.width = Math.min( image.width, options.maxTextureSize );
canvas.height = Math.min( image.height, options.maxTextureSize );
if ( options.forcePowerOfTwoTextures && ! isPowerOfTwo( canvas ) ) {
console.warn( 'GLTFExporter: Resized non-power-of-two image.', image );
canvas.width = THREE.MathUtils.floorPowerOfTwo( canvas.width );
canvas.height = THREE.MathUtils.floorPowerOfTwo( canvas.height );
}
var ctx = canvas.getContext( '2d' );
if ( flipY === true ) {
ctx.translate( 0, canvas.height );
ctx.scale( 1, - 1 );
}
ctx.drawImage( image, 0, 0, canvas.width, canvas.height );
if ( options.binary === true ) {
pending.push( new Promise( function ( resolve ) {
canvas.toBlob( function ( blob ) {
processBufferViewImage( blob ).then( function ( bufferViewIndex ) {
gltfImage.bufferView = bufferViewIndex;
resolve();
} );
}, mimeType );
} ) );
} else {
gltfImage.uri = canvas.toDataURL( mimeType );
}
} else {
gltfImage.uri = image.src;
}
outputJSON.images.push( gltfImage );
var index = outputJSON.images.length - 1;
cachedImages[ key ] = index;
return index;
}
/**
* Process sampler
* @param {Texture} map Texture to process
* @return {Integer} Index of the processed texture in the "samplers" array
*/
function processSampler( map ) {
if ( ! outputJSON.samplers ) {
outputJSON.samplers = [];
}
var gltfSampler = {
magFilter: THREE_TO_WEBGL[ map.magFilter ],
minFilter: THREE_TO_WEBGL[ map.minFilter ],
wrapS: THREE_TO_WEBGL[ map.wrapS ],
wrapT: THREE_TO_WEBGL[ map.wrapT ]
};
outputJSON.samplers.push( gltfSampler );
return outputJSON.samplers.length - 1;
}
/**
* Process texture
* @param {Texture} map Map to process
* @return {Integer} Index of the processed texture in the "textures" array
*/
function processTexture( map ) {
if ( cachedData.textures.has( map ) ) {
return cachedData.textures.get( map );
}
if ( ! outputJSON.textures ) {
outputJSON.textures = [];
}
var gltfTexture = {
sampler: processSampler( map ),
source: processImage( map.image, map.format, map.flipY )
};
if ( map.name ) {
gltfTexture.name = map.name;
}
outputJSON.textures.push( gltfTexture );
var index = outputJSON.textures.length - 1;
cachedData.textures.set( map, index );
return index;
}
/**
* Process material
* @param {THREE.Material} material Material to process
* @return {Integer} Index of the processed material in the "materials" array
*/
function processMaterial( material ) {
if ( cachedData.materials.has( material ) ) {
return cachedData.materials.get( material );
}
if ( ! outputJSON.materials ) {
outputJSON.materials = [];
}
if ( material.isShaderMaterial && ! material.isGLTFSpecularGlossinessMaterial ) {
console.warn( 'GLTFExporter: THREE.ShaderMaterial not supported.' );
return null;
}
// @QUESTION Should we avoid including any attribute that has the default value?
var gltfMaterial = {
pbrMetallicRoughness: {}
};
if ( material.isMeshBasicMaterial ) {
gltfMaterial.extensions = { KHR_materials_unlit: {} };
extensionsUsed[ 'KHR_materials_unlit' ] = true;
} else if ( material.isGLTFSpecularGlossinessMaterial ) {
gltfMaterial.extensions = { KHR_materials_pbrSpecularGlossiness: {} };
extensionsUsed[ 'KHR_materials_pbrSpecularGlossiness' ] = true;
} else if ( ! material.isMeshStandardMaterial ) {
console.warn( 'GLTFExporter: Use MeshStandardMaterial or MeshBasicMaterial for best results.' );
}
// pbrMetallicRoughness.baseColorFactor
var color = material.color.toArray().concat( [ material.opacity ] );
if ( ! equalArray( color, [ 1, 1, 1, 1 ] ) ) {
gltfMaterial.pbrMetallicRoughness.baseColorFactor = color;
}
if ( material.isMeshStandardMaterial ) {