webvr js meetup initial commit

node_modules/three/src/geometries/ParametricGeometry.js

@@ -0,0 +1,116 @@
+/**
+ * @author zz85 / https://github.com/zz85
+ *
+ * Parametric Surfaces Geometry
+ * based on the brilliant article by @prideout http://prideout.net/blog/?p=44
+ */
+
+import { Geometry } from '../core/Geometry';
+
+function ParametricGeometry( func, slices, stacks ) {
+
+	Geometry.call( this );
+
+	this.type = 'ParametricGeometry';
+
+	this.parameters = {
+		func: func,
+		slices: slices,
+		stacks: stacks
+	};
+
+	this.fromBufferGeometry( new ParametricBufferGeometry( func, slices, stacks ) );
+	this.mergeVertices();
+
+}
+
+ParametricGeometry.prototype = Object.create( Geometry.prototype );
+ParametricGeometry.prototype.constructor = ParametricGeometry;
+
+/**
+ * @author Mugen87 / https://github.com/Mugen87
+ *
+ * Parametric Surfaces Geometry
+ * based on the brilliant article by @prideout http://prideout.net/blog/?p=44
+ */
+
+import { BufferGeometry } from '../core/BufferGeometry';
+import { Float32BufferAttribute } from '../core/BufferAttribute';
+
+function ParametricBufferGeometry( func, slices, stacks ) {
+
+	BufferGeometry.call( this );
+
+	this.type = 'ParametricBufferGeometry';
+
+	this.parameters = {
+		func: func,
+		slices: slices,
+		stacks: stacks
+	};
+
+	// buffers
+
+	var indices = [];
+	var vertices = [];
+	var uvs = [];
+
+	var i, j;
+
+	// generate vertices and uvs
+
+	var sliceCount = slices + 1;
+
+	for ( i = 0; i <= stacks; i ++ ) {
+
+		var v = i / stacks;
+
+		for ( j = 0; j <= slices; j ++ ) {
+
+			var u = j / slices;
+
+			var p = func( u, v );
+			vertices.push( p.x, p.y, p.z );
+
+			uvs.push( u, v );
+
+		}
+
+	}
+
+	// generate indices
+
+	for ( i = 0; i < stacks; i ++ ) {
+
+		for ( j = 0; j < slices; j ++ ) {
+
+			var a = i * sliceCount + j;
+			var b = i * sliceCount + j + 1;
+			var c = ( i + 1 ) * sliceCount + j + 1;
+			var d = ( i + 1 ) * sliceCount + j;
+
+			// faces one and two
+
+			indices.push( a, b, d );
+			indices.push( b, c, d );
+
+		}
+
+	}
+
+	// build geometry
+
+	this.setIndex( indices );
+	this.addAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
+	this.addAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );
+
+	// generate normals
+
+	this.computeVertexNormals();
+
+}
+
+ParametricBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
+ParametricBufferGeometry.prototype.constructor = ParametricBufferGeometry;
+
+export { ParametricGeometry, ParametricBufferGeometry };