117 lines
2.2 KiB
JavaScript
117 lines
2.2 KiB
JavaScript
/**
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* @author zz85 / https://github.com/zz85
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*
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* Parametric Surfaces Geometry
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* based on the brilliant article by @prideout http://prideout.net/blog/?p=44
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*/
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import { Geometry } from '../core/Geometry';
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function ParametricGeometry( func, slices, stacks ) {
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Geometry.call( this );
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this.type = 'ParametricGeometry';
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this.parameters = {
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func: func,
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slices: slices,
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stacks: stacks
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};
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this.fromBufferGeometry( new ParametricBufferGeometry( func, slices, stacks ) );
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this.mergeVertices();
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}
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ParametricGeometry.prototype = Object.create( Geometry.prototype );
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ParametricGeometry.prototype.constructor = ParametricGeometry;
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/**
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* @author Mugen87 / https://github.com/Mugen87
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*
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* Parametric Surfaces Geometry
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* based on the brilliant article by @prideout http://prideout.net/blog/?p=44
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*/
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import { BufferGeometry } from '../core/BufferGeometry';
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import { Float32BufferAttribute } from '../core/BufferAttribute';
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function ParametricBufferGeometry( func, slices, stacks ) {
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BufferGeometry.call( this );
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this.type = 'ParametricBufferGeometry';
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this.parameters = {
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func: func,
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slices: slices,
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stacks: stacks
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};
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// buffers
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var indices = [];
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var vertices = [];
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var uvs = [];
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var i, j;
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// generate vertices and uvs
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var sliceCount = slices + 1;
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for ( i = 0; i <= stacks; i ++ ) {
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var v = i / stacks;
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for ( j = 0; j <= slices; j ++ ) {
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var u = j / slices;
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var p = func( u, v );
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vertices.push( p.x, p.y, p.z );
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uvs.push( u, v );
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}
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}
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// generate indices
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for ( i = 0; i < stacks; i ++ ) {
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for ( j = 0; j < slices; j ++ ) {
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var a = i * sliceCount + j;
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var b = i * sliceCount + j + 1;
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var c = ( i + 1 ) * sliceCount + j + 1;
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var d = ( i + 1 ) * sliceCount + j;
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// faces one and two
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indices.push( a, b, d );
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indices.push( b, c, d );
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}
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}
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// build geometry
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this.setIndex( indices );
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this.addAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
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this.addAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );
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// generate normals
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this.computeVertexNormals();
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}
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ParametricBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
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ParametricBufferGeometry.prototype.constructor = ParametricBufferGeometry;
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export { ParametricGeometry, ParametricBufferGeometry };
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