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34 lines
783 B
JavaScript
34 lines
783 B
JavaScript
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import TempNode from '../core/TempNode.js';
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import { positionWorldDirection } from '../accessors/PositionNode.js';
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import { nodeProxy, vec2 } from '../shadernode/ShaderNode.js';
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import { addNodeClass } from '../core/Node.js';
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class EquirectUVNode extends TempNode {
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constructor( dirNode = positionWorldDirection ) {
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super( 'vec2' );
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this.dirNode = dirNode;
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}
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construct() {
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const dir = this.dirNode;
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const u = dir.z.atan2( dir.x ).mul( 1 / ( Math.PI * 2 ) ).add( 0.5 );
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const v = dir.y.negate().clamp( - 1.0, 1.0 ).asin().mul( 1 / Math.PI ).add( 0.5 ); // @TODO: The use of negate() here could be an NDC issue.
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return vec2( u, v );
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}
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}
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export default EquirectUVNode;
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export const equirectUV = nodeProxy( EquirectUVNode );
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addNodeClass( EquirectUVNode );
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