three
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JavaScript 3D library
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JavaScript
import AnalyticLightNode from './AnalyticLightNode.js';
import { uniform } from '../core/UniformNode.js';
import { mix } from '../math/MathNode.js';
import { normalView } from '../accessors/Normal.js';
import { lightPosition } from '../accessors/Lights.js';
import { renderGroup } from '../core/UniformGroupNode.js';
import { Color } from '../../math/Color.js';
class HemisphereLightNode extends AnalyticLightNode {
static get type() {
return 'HemisphereLightNode';
}
constructor( light = null ) {
super( light );
this.lightPositionNode = lightPosition( light );
this.lightDirectionNode = this.lightPositionNode.normalize();
this.groundColorNode = uniform( new Color() ).setGroup( renderGroup );
}
update( frame ) {
const { light } = this;
super.update( frame );
this.lightPositionNode.object3d = light;
this.groundColorNode.value.copy( light.groundColor ).multiplyScalar( light.intensity );
}
setup( builder ) {
const { colorNode, groundColorNode, lightDirectionNode } = this;
const dotNL = normalView.dot( lightDirectionNode );
const hemiDiffuseWeight = dotNL.mul( 0.5 ).add( 0.5 );
const irradiance = mix( groundColorNode, colorNode, hemiDiffuseWeight );
builder.context.irradiance.addAssign( irradiance );
}
}
export default HemisphereLightNode;