Three.js Source Note (77) Extras/geometries/lathegeometry.js

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The following code is a comment for the extras/geometries/lathegeometry.js file in the three.js source file.

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/** * @author astrodud/http://astrodud.isgreat.org/* @author zz85/https://github.com/zz85 * @author bhouston/http:/ The/exocortex.com *//*///lathegeometry class creates rotational geometry from a section vertex array (points).//////usage:///var points = [];///for (var i = 0; i <; I + +) {///points.push (new three). Vector3 (Math.sin (i * 0.2) * + 0, (i-5) * 2));///}///var geometry = new three. Lathegeometry (points);///var material = new three. Meshbasicmaterial ({color:0xffff00});///var lathe = new three. Mesh (geometry, material);///scene.add (lathe); *////<summary>lathegeometry</summary>///<param name = "Points" type= "float" > Rotating body section vertex array </param>///<param name = "segments" type= "int" > Subdivision segment number of rotation circle of rotating body </ Param>///<param name = "Phistart" type= "float" > The starting point of the rotation body </param>///<param name = "Philength" type= " Float "> Arc length </param>//points-to Create a closed torus, one must use a set of points//create a closed torus,//Like so : [A, B, C, D, a], see first was the same as last.For example [A,b,c,d,a], the first vertex must be the same as the last vertex.//segments-the number of circumference segments to create//rotation circle segments//phistart-th E starting Radian//rotation section starting point, default initialization 0.//philength-the radian (0 to 2*pi) range of the lathed section//2*pi is a Clos Ed lathe, less than 2PI is a portion. The arc length of the rotation is initialized to 2*PI by default. Three. Lathegeometry = function (points, segments, Phistart, Philength) {three. Geometry.call (this); segments = Segments | | 12;phistart = Phistart | | 0;philength = Philength | | 2 * Math.pi;var Inversepointlength = 1.0/(points.length-1); var inversesegments = 1.0/segments;//The rotation body section vertex array is rotated to get all The array of vertices. for (var i = 0, il = segments; i <= il; i + +) {var phi = Phistart + i * inversesegments * philength;var c = Mat  H.cos (phi), S = Math.sin (phi), for (var j = 0, JL = points.length; J < JL; J + +) {var pt = points[J];var vertex = New three. Vector3 (); vertex.x = c * pt.x-s * pt.y;vertex.y = s * pt.x + c * pt.y;vertex.z = Pt.z;this.vertices.push (vertex);}} var np = points.length;//willAll vertex calculations generate triangular polygons and calculate the uvfor of the triangular polygon map (var i = 0, il = segments; i < il; i + +) {for (var j = 0, JL = points.length-1; J &lt ; Jl J + +) {var base = j + NP * I;var a = Base;var B = base + Np;var c = base + 1 + np;var D = base + 1;var u0 = i * Inversese  Gments;var V0 = J * Inversepointlength;var u1 = u0 + Inversesegments;var v1 = v0 + inversepointlength;this.faces.push (new Three. Face3 (A, B, D)); this.facevertexuvs[0].push ([new three. Vector2 (u0, V0), new three. Vector2 (U1, V0), new three. Vector2 (u0, v1)]); This.faces.push (new three. Face3 (b, C, D)); this.facevertexuvs[0].push ([new three. Vector2 (U1, V0), new three. Vector2 (U1, v1), new three. Vector2 (u0, v1)]);}} This.mergevertices ();//merge vertices, delete extra vertices this.computefacenormals ();//calculate normals of triangular faces this.computevertexnormals ();//calculate normals of vertices };/***************************************************** The following is the method property definition for the Lathegeometry object, inherited from the Geometry object. ************** /three. Lathegeometry.prototype = Object.create (three. Geometry.Prototype); 

Commercial Territory (http://blog.csdn.net/omni360/)

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Reprint Please keep this sentence: Business Domain-this blog focuses on Agile development and mobile and IoT device research: Data visualization, Golang, HTML5, WEBGL, three. JS, Otherwise, from this blog article refused to reprint or reprint, thank you for your cooperation.

The following code is a comment for the extras/geometries/lathegeometry.js file in the three.js source file.

More updates in: Https://github.com/omni360/three.js.sourcecode

Three.js Source Note (77) Extras/geometries/lathegeometry.js