import { Curve, ParametricGeometry, Vector3 } from '../../../build/three.module.js'; /** * Experimenting of primitive geometry creation using Surface Parametric equations */ const ParametricGeometries = { klein: function ( v, u, target ) { u *= Math.PI; v *= 2 * Math.PI; u = u * 2; let x, z; if ( u < Math.PI ) { x = 3 * Math.cos( u ) * ( 1 + Math.sin( u ) ) + ( 2 * ( 1 - Math.cos( u ) / 2 ) ) * Math.cos( u ) * Math.cos( v ); z = - 8 * Math.sin( u ) - 2 * ( 1 - Math.cos( u ) / 2 ) * Math.sin( u ) * Math.cos( v ); } else { x = 3 * Math.cos( u ) * ( 1 + Math.sin( u ) ) + ( 2 * ( 1 - Math.cos( u ) / 2 ) ) * Math.cos( v + Math.PI ); z = - 8 * Math.sin( u ); } const y = - 2 * ( 1 - Math.cos( u ) / 2 ) * Math.sin( v ); target.set( x, y, z ); }, plane: function ( width, height ) { return function ( u, v, target ) { const x = u * width; const y = 0; const z = v * height; target.set( x, y, z ); }; }, mobius: function ( u, t, target ) { // flat mobius strip // http://www.wolframalpha.com/input/?i=M%C3%B6bius+strip+parametric+equations&lk=1&a=ClashPrefs_*Surface.MoebiusStrip.SurfaceProperty.ParametricEquations- u = u - 0.5; const v = 2 * Math.PI * t; const a = 2; const x = Math.cos( v ) * ( a + u * Math.cos( v / 2 ) ); const y = Math.sin( v ) * ( a + u * Math.cos( v / 2 ) ); const z = u * Math.sin( v / 2 ); target.set( x, y, z ); }, mobius3d: function ( u, t, target ) { // volumetric mobius strip u *= Math.PI; t *= 2 * Math.PI; u = u * 2; const phi = u / 2; const major = 2.25, a = 0.125, b = 0.65; let x = a * Math.cos( t ) * Math.cos( phi ) - b * Math.sin( t ) * Math.sin( phi ); const z = a * Math.cos( t ) * Math.sin( phi ) + b * Math.sin( t ) * Math.cos( phi ); const y = ( major + x ) * Math.sin( u ); x = ( major + x ) * Math.cos( u ); target.set( x, y, z ); } }; /********************************************* * * Parametric Replacement for TubeGeometry * *********************************************/ ParametricGeometries.TubeGeometry = class TubeGeometry extends ParametricGeometry { constructor( path, segments = 64, radius = 1, segmentsRadius = 8, closed = false ) { const numpoints = segments + 1; const frames = path.computeFrenetFrames( segments, closed ), tangents = frames.tangents, normals = frames.normals, binormals = frames.binormals; const position = new Vector3(); function ParametricTube( u, v, target ) { v *= 2 * Math.PI; const i = Math.floor( u * ( numpoints - 1 ) ); path.getPointAt( u, position ); const normal = normals[ i ]; const binormal = binormals[ i ]; const cx = - radius * Math.cos( v ); // TODO: Hack: Negating it so it faces outside. const cy = radius * Math.sin( v ); position.x += cx * normal.x + cy * binormal.x; position.y += cx * normal.y + cy * binormal.y; position.z += cx * normal.z + cy * binormal.z; target.copy( position ); } super( ParametricTube, segments, segmentsRadius ); // proxy internals this.tangents = tangents; this.normals = normals; this.binormals = binormals; this.path = path; this.segments = segments; this.radius = radius; this.segmentsRadius = segmentsRadius; this.closed = closed; } }; /********************************************* * * Parametric Replacement for TorusKnotGeometry * *********************************************/ ParametricGeometries.TorusKnotGeometry = class TorusKnotGeometry extends ParametricGeometries.TubeGeometry { constructor( radius = 200, tube = 40, segmentsT = 64, segmentsR = 8, p = 2, q = 3 ) { class TorusKnotCurve extends Curve { getPoint( t, optionalTarget = new Vector3() ) { const point = optionalTarget; t *= Math.PI * 2; const r = 0.5; const x = ( 1 + r * Math.cos( q * t ) ) * Math.cos( p * t ); const y = ( 1 + r * Math.cos( q * t ) ) * Math.sin( p * t ); const z = r * Math.sin( q * t ); return point.set( x, y, z ).multiplyScalar( radius ); } } const segments = segmentsT; const radiusSegments = segmentsR; const extrudePath = new TorusKnotCurve(); super( extrudePath, segments, tube, radiusSegments, true, false ); this.radius = radius; this.tube = tube; this.segmentsT = segmentsT; this.segmentsR = segmentsR; this.p = p; this.q = q; } }; /********************************************* * * Parametric Replacement for SphereGeometry * *********************************************/ ParametricGeometries.SphereGeometry = class SphereGeometry extends ParametricGeometry { constructor( size, u, v ) { function sphere( u, v, target ) { u *= Math.PI; v *= 2 * Math.PI; var x = size * Math.sin( u ) * Math.cos( v ); var y = size * Math.sin( u ) * Math.sin( v ); var z = size * Math.cos( u ); target.set( x, y, z ); } super( sphere, u, v ); } }; /********************************************* * * Parametric Replacement for PlaneGeometry * *********************************************/ ParametricGeometries.PlaneGeometry = class PlaneGeometry extends ParametricGeometry { constructor( width, depth, segmentsWidth, segmentsDepth ) { function plane( u, v, target ) { const x = u * width; const y = 0; const z = v * depth; target.set( x, y, z ); } super( plane, segmentsWidth, segmentsDepth ); } }; export { ParametricGeometries };