three
Version:
JavaScript 3D library
156 lines (83 loc) • 3.14 kB
JavaScript
import { TempNode } from '../core/TempNode.js';
import { PositionNode } from './PositionNode.js';
import { NormalNode } from './NormalNode.js';
function ReflectNode( scope ) {
TempNode.call( this, 'v3' );
this.scope = scope || ReflectNode.CUBE;
}
ReflectNode.CUBE = 'cube';
ReflectNode.SPHERE = 'sphere';
ReflectNode.VECTOR = 'vector';
ReflectNode.prototype = Object.create( TempNode.prototype );
ReflectNode.prototype.constructor = ReflectNode;
ReflectNode.prototype.nodeType = "Reflect";
ReflectNode.prototype.getUnique = function ( builder ) {
return ! builder.context.viewNormal;
};
ReflectNode.prototype.getType = function ( /* builder */ ) {
switch ( this.scope ) {
case ReflectNode.SPHERE:
return 'v2';
}
return this.type;
};
ReflectNode.prototype.generate = function ( builder, output ) {
var isUnique = this.getUnique( builder );
if ( builder.isShader( 'fragment' ) ) {
var result;
switch ( this.scope ) {
case ReflectNode.VECTOR:
var viewNormalNode = new NormalNode( NormalNode.VIEW );
var roughnessNode = builder.context.roughness;
var viewNormal = viewNormalNode.build( builder, 'v3' );
var viewPosition = new PositionNode( PositionNode.VIEW ).build( builder, 'v3' );
var roughness = roughnessNode ? roughnessNode.build( builder, 'f' ) : undefined;
var method = `reflect( -normalize( ${viewPosition} ), ${viewNormal} )`;
if ( roughness ) {
// Mixing the reflection with the normal is more accurate and keeps rough objects from gathering light from behind their tangent plane.
method = `normalize( mix( ${method}, ${viewNormal}, ${roughness} * ${roughness} ) )`;
}
var code = `inverseTransformDirection( ${method}, viewMatrix )`;
if ( isUnique ) {
builder.addNodeCode( `vec3 reflectVec = ${code};` );
result = 'reflectVec';
} else {
result = code;
}
break;
case ReflectNode.CUBE:
var reflectVec = new ReflectNode( ReflectNode.VECTOR ).build( builder, 'v3' );
var code = 'vec3( -' + reflectVec + '.x, ' + reflectVec + '.yz )';
if ( isUnique ) {
builder.addNodeCode( `vec3 reflectCubeVec = ${code};` );
result = 'reflectCubeVec';
} else {
result = code;
}
break;
case ReflectNode.SPHERE:
var reflectVec = new ReflectNode( ReflectNode.VECTOR ).build( builder, 'v3' );
var code = 'normalize( ( viewMatrix * vec4( ' + reflectVec + ', 0.0 ) ).xyz + vec3( 0.0, 0.0, 1.0 ) ).xy * 0.5 + 0.5';
if ( isUnique ) {
builder.addNodeCode( `vec2 reflectSphereVec = ${code};` );
result = 'reflectSphereVec';
} else {
result = code;
}
break;
}
return builder.format( result, this.getType( builder ), output );
} else {
console.warn( "THREE.ReflectNode is not compatible with " + builder.shader + " shader." );
return builder.format( 'vec3( 0.0 )', this.type, output );
}
};
ReflectNode.prototype.toJSON = function ( meta ) {
var data = this.getJSONNode( meta );
if ( ! data ) {
data = this.createJSONNode( meta );
data.scope = this.scope;
}
return data;
};
export { ReflectNode };