three
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JavaScript 3D library
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JavaScript
/*
* @author zz85 / http://twitter.com/blurspline / http://www.lab4games.net/zz85/blog
* @author Matthew Adams / http://www.centerionware.com - added UV support and rewrote to use buffergeometry.
*
* Subdivision Geometry Modifier using Loop Subdivision Scheme for Geometry / BufferGeometry
*
* References:
* http://graphics.stanford.edu/~mdfisher/subdivision.html
* http://www.holmes3d.net/graphics/subdivision/
* http://www.cs.rutgers.edu/~decarlo/readings/subdiv-sg00c.pdf
*
* Known Issues:
* - currently doesn't handle "Sharp Edges"
* - no checks to prevent breaking when uv's don't exist.
* - vertex colors are unsupported.
* **DDS Images when using corrected uv's passed to subdivision modifier will have their uv's flipy'd within the correct uv set
* **Either flipy the DDS image, or use shaders. Don't try correcting the uv's before passing into subdiv (eg: v=1-v).
*
* @input THREE.Geometry, or index'd THREE.BufferGeometry with faceUV's (Not vertex uv's)
* @output non-indexed vertex points, uv's, normals.
*
* The TypedArrayHelper class is designed to assist managing typed arrays, and to allow the removal of all 'new Vector3, new Face3, new Vector2'.
*
* It will automatically resize them if trying to push a new element to an array that isn't long enough
* It provides 'registers' that the units can be mapped to. This allows a small set of objects
* (ex: vector3's, face3's, vector2's) to be allocated then used, to eliminate any need to rewrite all
* the features those classes offer while not requiring some_huge_number to be allocated.
* It should be moved into it's own file honestly, then included before the BufferSubdivisionModifier - maybe in three's core?
*
*/
THREE.Face3.prototype.set = function( a, b, c ) {
this.a = a;
this.b = b;
this.c = c;
};
var TypedArrayHelper = function( size, registers, register_type, array_type, unit_size, accessors ) {
this.array_type = array_type;
this.register_type = register_type;
this.unit_size = unit_size;
this.accessors = accessors;
this.buffer = new array_type( size * unit_size );
this.register = [];
this.length = 0;
this.real_length = size;
this.available_registers = registers;
for ( var i = 0; i < registers; i++ ) {
this.register.push( new register_type() );
}
};
TypedArrayHelper.prototype = {
constructor: TypedArrayHelper,
index_to_register: function( index, register, isLoop ) {
var base = index * this.unit_size;
if ( register >= this.available_registers ) {
throw new Error( 'THREE.BufferSubdivisionModifier: Not enough registers in TypedArrayHelper.' );
}
if ( index > this.length ) {
throw new Error( 'THREE.BufferSubdivisionModifier: Index is out of range in TypedArrayHelper.' );
}
for ( var i = 0; i < this.unit_size; i++ ) {
( this.register[ register ] )[ this.accessors[ i ] ] = this.buffer[ base + i ];
}
},
resize: function( new_size ) {
if ( new_size === 0 ) {
new_size = 8;
}
if ( new_size < this.length ) {
this.buffer = this.buffer.subarray( 0, this.length * this.unit_size );
} else {
var nBuffer;
if ( this.buffer.length < new_size * this.unit_size ) {
nBuffer = new this.array_type( new_size * this.unit_size );
nBuffer.set( this.buffer );
this.buffer = nBuffer;
this.real_length = new_size;
} else {
nBuffer = new this.array_type( new_size * this.unit_size );
nBuffer.set( this.buffer.subarray( 0, this.length * this.unit_size ) );
this.buffer = nBuffer;
this.real_length = new_size;
}
}
},
from_existing: function( oldArray ) {
var new_size = oldArray.length;
this.buffer = new this.array_type( new_size );
this.buffer.set( oldArray );
this.length = oldArray.length / this.unit_size;
this.real_length = this.length;
},
push_element: function( vector ) {
if ( this.length + 1 > this.real_length ) {
this.resize( this.real_length * 2 );
}
var bpos = this.length * this.unit_size;
for ( var i = 0; i < this.unit_size; i++ ) {
this.buffer[ bpos + i ] = vector[ this.accessors[ i ] ];
}
this.length++;
},
trim_size: function() {
if ( this.length < this.real_length ) {
this.resize( this.length );
}
}
};
function convertGeometryToIndexedBuffer( geometry ) {
var BGeom = new THREE.BufferGeometry();
// create a new typed array
var vertArray = new TypedArrayHelper( geometry.vertices.length, 0, THREE.Vector3, Float32Array, 3, [ 'x', 'y', 'z' ] );
var indexArray = new TypedArrayHelper( geometry.faces.length, 0, THREE.Face3, Uint32Array, 3, [ 'a', 'b', 'c' ] );
var uvArray = new TypedArrayHelper( geometry.faceVertexUvs[0].length * 3 * 3, 0, THREE.Vector2, Float32Array, 2, [ 'x', 'y' ] );
for ( var i = 0, il = geometry.vertices.length; i < il; i++ ) {
vertArray.push_element( geometry.vertices[ i ] );
}
for ( var i = 0, il = geometry.faces.length; i < il; i++ ) {
indexArray.push_element( geometry.faces[ i ] );
}
for ( var i = 0, il = geometry.faceVertexUvs[ 0 ].length; i < il; i++ ) {
uvArray.push_element( geometry.faceVertexUvs[ 0 ][ i ][ 0 ] );
uvArray.push_element( geometry.faceVertexUvs[ 0 ][ i ][ 1 ] );
uvArray.push_element( geometry.faceVertexUvs[ 0 ][ i ][ 2 ] );
}
indexArray.trim_size();
vertArray.trim_size();
uvArray.trim_size();
BGeom.setIndex( new THREE.BufferAttribute( indexArray.buffer, 3 ) );
BGeom.addAttribute( 'position', new THREE.BufferAttribute( vertArray.buffer, 3 ) );
BGeom.addAttribute( 'uv', new THREE.BufferAttribute( uvArray.buffer, 2 ) );
return BGeom;
}
function compute_vertex_normals( geometry ) {
var ABC = [ 'a', 'b', 'c' ];
var XYZ = [ 'x', 'y', 'z' ];
var XY = [ 'x', 'y' ];
var oldVertices = new TypedArrayHelper( 0, 5, THREE.Vector3, Float32Array, 3, XYZ );
var oldFaces = new TypedArrayHelper( 0, 3, THREE.Face3, Uint32Array, 3, ABC );
oldVertices.from_existing( geometry.getAttribute( 'position' ).array );
var newNormals = new TypedArrayHelper( oldVertices.length * 3, 4, THREE.Vector3, Float32Array, 3, XYZ );
var newNormalFaces = new TypedArrayHelper( oldVertices.length, 1, function () { this.x = 0; }, Float32Array, 1, [ 'x' ] );
newNormals.length = oldVertices.length;
oldFaces.from_existing( geometry.index.array );
var a, b, c;
var my_weight;
var full_weights = [ 0.0, 0.0, 0.0 ];
for ( var i = 0, il = oldFaces.length; i < il; i++ ) {
oldFaces.index_to_register( i, 0 );
oldVertices.index_to_register( oldFaces.register[ 0 ].a, 0 );
oldVertices.index_to_register( oldFaces.register[ 0 ].b, 1 );
oldVertices.index_to_register( oldFaces.register[ 0 ].c, 2 );
newNormals.register[ 0 ].subVectors( oldVertices.register[ 1 ], oldVertices.register[ 0 ] );
newNormals.register[ 1 ].subVectors( oldVertices.register[ 2 ], oldVertices.register[ 1 ] );
newNormals.register[ 0 ].cross( newNormals.register[ 1 ] );
my_weight = Math.abs( newNormals.register[ 0 ].length() );
newNormalFaces.buffer[ oldFaces.register[ 0 ].a ] += my_weight;
newNormalFaces.buffer[ oldFaces.register[ 0 ].b ] += my_weight;
newNormalFaces.buffer[ oldFaces.register[ 0 ].c ] += my_weight;
}
var t_len;
for ( var i = 0, il = oldFaces.length; i < il; i++ ) {
oldFaces.index_to_register( i, 0 );
oldVertices.index_to_register( oldFaces.register[ 0 ].a, 0 );
oldVertices.index_to_register( oldFaces.register[ 0 ].b, 1 );
oldVertices.index_to_register( oldFaces.register[ 0 ].c, 2 );
newNormals.register[ 0 ].subVectors( oldVertices.register[ 1 ], oldVertices.register[ 0 ] );
newNormals.register[ 1 ].subVectors( oldVertices.register[ 2 ], oldVertices.register[ 0 ] );
newNormals.register[ 3 ].set( 0, 0, 0 );
newNormals.register[ 3 ].x = ( newNormals.register[ 0 ].y * newNormals.register[ 1 ].z ) - ( newNormals.register[ 0 ].z * newNormals.register[ 1 ].y );
newNormals.register[ 3 ].y = ( newNormals.register[ 0 ].z * newNormals.register[ 1 ].x ) - ( newNormals.register[ 0 ].x * newNormals.register[ 1 ].z );
newNormals.register[ 3 ].z = ( newNormals.register[ 0 ].x * newNormals.register[ 1 ].y ) - ( newNormals.register[ 0 ].y * newNormals.register[ 1 ].x );
newNormals.register[ 0 ].cross( newNormals.register[ 1 ] );
my_weight = Math.abs( newNormals.register[ 0 ].length() );
full_weights[ 0 ] = ( my_weight / newNormalFaces.buffer[ oldFaces.register[ 0 ].a ] );
full_weights[ 1 ] = ( my_weight / newNormalFaces.buffer[ oldFaces.register[ 0 ].b ] );
full_weights[ 2 ] = ( my_weight / newNormalFaces.buffer[ oldFaces.register[ 0 ].c ] );
newNormals.buffer[ ( oldFaces.register[ 0 ].a * 3 ) + 0 ] += newNormals.register[ 3 ].x * full_weights[ 0 ];
newNormals.buffer[ ( oldFaces.register[ 0 ].a * 3 ) + 1 ] += newNormals.register[ 3 ].y * full_weights[ 0 ];
newNormals.buffer[ ( oldFaces.register[ 0 ].a * 3 ) + 2 ] += newNormals.register[ 3 ].z * full_weights[ 0 ];
newNormals.buffer[ ( oldFaces.register[ 0 ].b * 3 ) + 0 ] += newNormals.register[ 3 ].x * full_weights[ 1 ];
newNormals.buffer[ ( oldFaces.register[ 0 ].b * 3 ) + 1 ] += newNormals.register[ 3 ].y * full_weights[ 1 ];
newNormals.buffer[ ( oldFaces.register[ 0 ].b * 3 ) + 2 ] += newNormals.register[ 3 ].z * full_weights[ 1 ];
newNormals.buffer[ ( oldFaces.register[ 0 ].c * 3 ) + 0 ] += newNormals.register[ 3 ].x * full_weights[ 2 ];
newNormals.buffer[ ( oldFaces.register[ 0 ].c * 3 ) + 1 ] += newNormals.register[ 3 ].y * full_weights[ 2 ];
newNormals.buffer[ ( oldFaces.register[ 0 ].c * 3 ) + 2 ] += newNormals.register[ 3 ].z * full_weights[ 2 ];
}
newNormals.trim_size();
geometry.addAttribute( 'normal', new THREE.BufferAttribute( newNormals.buffer, 3 ) );
}
function unIndexIndexedGeometry( geometry ) {
var ABC = [ 'a', 'b', 'c' ];
var XYZ = [ 'x', 'y', 'z' ];
var XY = [ 'x', 'y' ];
var oldVertices = new TypedArrayHelper( 0, 3, THREE.Vector3, Float32Array, 3, XYZ );
var oldFaces = new TypedArrayHelper( 0, 3, THREE.Face3, Uint32Array, 3, ABC );
var oldUvs = new TypedArrayHelper( 0, 3, THREE.Vector2, Float32Array, 2, XY );
var oldNormals = new TypedArrayHelper( 0, 3, THREE.Vector3, Float32Array, 3, XYZ );
oldVertices.from_existing( geometry.getAttribute( 'position' ).array );
oldFaces.from_existing( geometry.index.array );
oldUvs.from_existing( geometry.getAttribute( 'uv' ).array );
compute_vertex_normals( geometry );
oldNormals.from_existing( geometry.getAttribute( 'normal' ).array );
var newVertices = new TypedArrayHelper( oldFaces.length * 3, 3, THREE.Vector3, Float32Array, 3, XYZ );
var newNormals = new TypedArrayHelper( oldFaces.length * 3, 3, THREE.Vector3, Float32Array, 3, XYZ );
var newUvs = new TypedArrayHelper( oldFaces.length * 3, 3, THREE.Vector2, Float32Array, 2, XY );
var v, w;
for ( var i = 0, il = oldFaces.length; i < il; i++ ) {
oldFaces.index_to_register( i, 0 );
oldVertices.index_to_register( oldFaces.register[ 0 ].a, 0 );
oldVertices.index_to_register( oldFaces.register[ 0 ].b, 1 );
oldVertices.index_to_register( oldFaces.register[ 0 ].c, 2 );
newVertices.push_element( oldVertices.register[ 0 ] );
newVertices.push_element( oldVertices.register[ 1 ] );
newVertices.push_element( oldVertices.register[ 2 ] );
if ( oldUvs.length !== 0 ) {
oldUvs.index_to_register( ( i * 3 ) + 0, 0 );
oldUvs.index_to_register( ( i * 3 ) + 1, 1 );
oldUvs.index_to_register( ( i * 3 ) + 2, 2 );
newUvs.push_element( oldUvs.register[ 0 ] );
newUvs.push_element( oldUvs.register[ 1 ] );
newUvs.push_element( oldUvs.register[ 2 ] );
}
oldNormals.index_to_register( oldFaces.register[ 0 ].a, 0 );
oldNormals.index_to_register( oldFaces.register[ 0 ].b, 1 );
oldNormals.index_to_register( oldFaces.register[ 0 ].c, 2 );
newNormals.push_element( oldNormals.register[ 0 ] );
newNormals.push_element( oldNormals.register[ 1 ] );
newNormals.push_element( oldNormals.register[ 2 ] );
}
newVertices.trim_size();
newUvs.trim_size();
newNormals.trim_size();
geometry.index = null;
geometry.addAttribute( 'position', new THREE.BufferAttribute( newVertices.buffer, 3 ) );
geometry.addAttribute( 'normal', new THREE.BufferAttribute( newNormals.buffer, 3 ) );
if ( newUvs.length !== 0 ) {
geometry.addAttribute( 'uv', new THREE.BufferAttribute( newUvs.buffer, 2 ) );
}
return geometry;
}
THREE.BufferSubdivisionModifier = function( subdivisions ) {
this.subdivisions = ( subdivisions === undefined ) ? 1 : subdivisions;
};
THREE.BufferSubdivisionModifier.prototype.modify = function( geometry ) {
if ( geometry instanceof THREE.Geometry ) {
geometry.mergeVertices();
if ( typeof geometry.normals === 'undefined' ) {
geometry.normals = [];
}
geometry = convertGeometryToIndexedBuffer( geometry );
} else if ( !( geometry instanceof THREE.BufferGeometry ) ) {
console.error( 'THREE.BufferSubdivisionModifier: Geometry is not an instance of THREE.BufferGeometry or THREE.Geometry' );
}
var repeats = this.subdivisions;
while ( repeats -- > 0 ) {
this.smooth( geometry );
}
return unIndexIndexedGeometry( geometry );
};
var edge_type = function ( a, b ) {
this.a = a;
this.b = b;
this.faces = [];
this.newEdge = null;
};
( function () {
// Some constants
var ABC = [ 'a', 'b', 'c' ];
var XYZ = [ 'x', 'y', 'z' ];
var XY = [ 'x', 'y' ];
function getEdge( a, b, map ) {
var key = Math.min( a, b ) + '_' + Math.max( a, b );
return map[ key ];
}
function processEdge( a, b, vertices, map, face, metaVertices ) {
var vertexIndexA = Math.min( a, b );
var vertexIndexB = Math.max( a, b );
var key = vertexIndexA + '_' + vertexIndexB;
var edge;
if ( key in map ) {
edge = map[ key ];
} else {
edge = new edge_type( vertexIndexA,vertexIndexB );
map[key] = edge;
}
edge.faces.push( face );
metaVertices[ a ].edges.push( edge );
metaVertices[ b ].edges.push( edge );
}
function generateLookups( vertices, faces, metaVertices, edges ) {
var i, il, face, edge;
for ( i = 0, il = vertices.length; i < il; i++ ) {
metaVertices[ i ] = { edges: [] };
}
for ( i = 0, il = faces.length; i < il; i++ ) {
faces.index_to_register( i, 0 );
face = faces.register[ 0 ]; // Faces is now a TypedArrayHelper class, not a face3.
processEdge( face.a, face.b, vertices, edges, i, metaVertices );
processEdge( face.b, face.c, vertices, edges, i, metaVertices );
processEdge( face.c, face.a, vertices, edges, i, metaVertices );
}
}
function newFace( newFaces, face ) {
newFaces.push_element( face );
}
function midpoint( a, b ) {
return ( Math.abs( b - a ) / 2 ) + Math.min( a, b );
}
function newUv( newUvs, a, b, c ) {
newUvs.push_element( a );
newUvs.push_element( b );
newUvs.push_element( c );
}
/////////////////////////////
// Performs one iteration of Subdivision
THREE.BufferSubdivisionModifier.prototype.smooth = function ( geometry ) {
var oldVertices, oldFaces, oldUvs;
var newVertices, newFaces, newUVs;
var n, l, i, il, j, k;
var metaVertices, sourceEdges;
oldVertices = new TypedArrayHelper( 0, 3, THREE.Vector3, Float32Array, 3, XYZ );
oldFaces = new TypedArrayHelper( 0, 3, THREE.Face3, Uint32Array, 3, ABC );
oldUvs = new TypedArrayHelper( 0, 3, THREE.Vector2, Float32Array, 2, XY );
oldVertices.from_existing( geometry.getAttribute( 'position' ).array );
oldFaces.from_existing( geometry.index.array );
oldUvs.from_existing( geometry.getAttribute( 'uv' ).array );
var doUvs = false;
if ( typeof oldUvs !== 'undefined' && oldUvs.length !== 0 ) {
doUvs = true;
}
/******************************************************
*
* Step 0: Preprocess Geometry to Generate edges Lookup
*
*******************************************************/
metaVertices = new Array( oldVertices.length );
sourceEdges = {}; // Edge => { oldVertex1, oldVertex2, faces[] }
generateLookups( oldVertices, oldFaces, metaVertices, sourceEdges );
/******************************************************
*
* Step 1.
* For each edge, create a new Edge Vertex,
* then position it.
*
*******************************************************/
newVertices = new TypedArrayHelper( ( geometry.getAttribute( 'position' ).array.length * 2 ) / 3, 2, THREE.Vector3, Float32Array, 3, XYZ );
var other, currentEdge, newEdge, face;
var edgeVertexWeight, adjacentVertexWeight, connectedFaces;
var tmp = newVertices.register[ 1 ];
for ( i in sourceEdges ) {
currentEdge = sourceEdges[ i ];
newEdge = newVertices.register[ 0 ];
edgeVertexWeight = 3 / 8;
adjacentVertexWeight = 1 / 8;
connectedFaces = currentEdge.faces.length;
// check how many linked faces. 2 should be correct.
if ( connectedFaces !== 2 ) {
// if length is not 2, handle condition
edgeVertexWeight = 0.5;
adjacentVertexWeight = 0;
}
oldVertices.index_to_register( currentEdge.a, 0 );
oldVertices.index_to_register( currentEdge.b, 1 );
newEdge.addVectors( oldVertices.register[ 0 ], oldVertices.register[ 1 ] ).multiplyScalar( edgeVertexWeight );
tmp.set( 0, 0, 0 );
for ( j = 0; j < connectedFaces; j++ ) {
oldFaces.index_to_register( currentEdge.faces[ j ], 0 );
face = oldFaces.register[ 0 ];
for ( k = 0; k < 3; k++ ) {
oldVertices.index_to_register( face[ ABC[ k ] ], 2 );
other = oldVertices.register[ 2 ];
if ( face[ ABC[ k ] ] !== currentEdge.a && face[ ABC[ k ] ] !== currentEdge.b) {
break;
}
}
tmp.add( other );
}
tmp.multiplyScalar( adjacentVertexWeight );
newEdge.add( tmp );
currentEdge.newEdge = newVertices.length;
newVertices.push_element( newEdge );
}
var edgeLength = newVertices.length;
/******************************************************
*
* Step 2.
* Reposition each source vertices.
*
*******************************************************/
var beta, sourceVertexWeight, connectingVertexWeight;
var connectingEdge, connectingEdges, oldVertex, newSourceVertex;
for ( i = 0, il = oldVertices.length; i < il; i++ ) {
oldVertices.index_to_register( i, 0, XYZ );
oldVertex = oldVertices.register[ 0 ];
// find all connecting edges (using lookupTable)
connectingEdges = metaVertices[ i ].edges;
n = connectingEdges.length;
if ( n === 3 ) {
beta = 3 / 16;
} else if (n > 3) {
beta = 3 / (8 * n); // Warren's modified formula
}
// Loop's original beta formula
// beta = 1 / n * ( 5/8 - Math.pow( 3/8 + 1/4 * Math.cos( 2 * Math. PI / n ), 2) );
sourceVertexWeight = 1 - n * beta;
connectingVertexWeight = beta;
if ( n <= 2 ) {
// crease and boundary rules
if ( n === 2 ) {
sourceVertexWeight = 3 / 4;
connectingVertexWeight = 1 / 8;
}
}
newSourceVertex = oldVertex.multiplyScalar( sourceVertexWeight );
tmp.set( 0, 0, 0 );
for ( j = 0; j < n; j++ ) {
connectingEdge = connectingEdges[ j ];
other = connectingEdge.a !== i ? connectingEdge.a : connectingEdge.b;
oldVertices.index_to_register( other, 1, XYZ );
tmp.add( oldVertices.register[ 1 ] );
}
tmp.multiplyScalar( connectingVertexWeight );
newSourceVertex.add( tmp );
newVertices.push_element( newSourceVertex,XYZ );
}
/******************************************************
*
* Step 3.
* Generate faces between source vertices and edge vertices.
*
*******************************************************/
var edge1, edge2, edge3;
newFaces = new TypedArrayHelper( ( geometry.index.array.length * 4 ) / 3, 1, THREE.Face3, Float32Array, 3, ABC );
newUVs = new TypedArrayHelper( ( geometry.getAttribute( 'uv' ).array.length * 4 ) / 2, 3, THREE.Vector2, Float32Array, 2, XY );
var x3 = newUVs.register[ 0 ];
var x4 = newUVs.register[ 1 ];
var x5 = newUVs.register[ 2 ];
var tFace = newFaces.register[ 0 ];
for ( i = 0, il = oldFaces.length; i < il; i++ ) {
oldFaces.index_to_register( i, 0 );
face = oldFaces.register[ 0 ];
// find the 3 new edges vertex of each old face
// The new source verts are added after the new edge verts now..
edge1 = getEdge( face.a, face.b, sourceEdges ).newEdge;
edge2 = getEdge( face.b, face.c, sourceEdges ).newEdge;
edge3 = getEdge( face.c, face.a, sourceEdges ).newEdge;
// create 4 faces.
tFace.set( edge1, edge2, edge3 );
newFace( newFaces, tFace );
tFace.set( face.a + edgeLength, edge1, edge3 );
newFace( newFaces, tFace );
tFace.set( face.b + edgeLength, edge2, edge1 );
newFace( newFaces, tFace );
tFace.set( face.c + edgeLength, edge3, edge2 );
newFace( newFaces, tFace );
/*
0________C_______2
\ /\ /
\ F2 / \ F4 /
\ / F1 \ /
\/______\/
A \ / B
\ F3 /
\ /
\/
1
Draw orders:
F1: ABC x3,x4,x5
F2: 0AC x0,x3,x5
F3: 1BA x1,x4,x3
F4: 2CB x2,x5,x4
0: x0
1: x1
2: x2
A: x3
B: x4
C: x5
*/
if ( doUvs === true ) {
oldUvs.index_to_register( ( i * 3 ) + 0, 0 );
oldUvs.index_to_register( ( i * 3 ) + 1, 1 );
oldUvs.index_to_register( ( i * 3 ) + 2, 2 );
var x0 = oldUvs.register[ 0 ]; // uv[0];
var x1 = oldUvs.register[ 1 ]; // uv[1];
var x2 = oldUvs.register[ 2 ]; // uv[2];
x3.set( midpoint( x0.x, x1.x ), midpoint( x0.y, x1.y ) );
x4.set( midpoint( x1.x, x2.x ), midpoint( x1.y, x2.y ) );
x5.set( midpoint( x0.x, x2.x ), midpoint( x0.y, x2.y ) );
newUv( newUVs, x3, x4, x5 );
newUv( newUVs, x0, x3, x5 );
newUv( newUVs, x1, x4, x3 );
newUv( newUVs, x2, x5, x4 );
}
}
// Overwrite old arrays
newFaces.trim_size();
newVertices.trim_size();
newUVs.trim_size();
geometry.setIndex( new THREE.BufferAttribute( newFaces.buffer ,3 ) );
geometry.addAttribute( 'position', new THREE.BufferAttribute( newVertices.buffer, 3 ) );
geometry.addAttribute( 'uv', new THREE.BufferAttribute( newUVs.buffer, 2 ) );
};
} ) ();