larry babby and threejs for glsl

webGl/my-threejs-test/node_modules/three/src/geometries/CircleGeometry.js

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+import { BufferGeometry } from '../core/BufferGeometry.js';
+import { Float32BufferAttribute } from '../core/BufferAttribute.js';
+import { Vector3 } from '../math/Vector3.js';
+import { Vector2 } from '../math/Vector2.js';
+
+class CircleGeometry extends BufferGeometry {
+
+	constructor( radius = 1, segments = 32, thetaStart = 0, thetaLength = Math.PI * 2 ) {
+
+		super();
+
+		this.type = 'CircleGeometry';
+
+		this.parameters = {
+			radius: radius,
+			segments: segments,
+			thetaStart: thetaStart,
+			thetaLength: thetaLength
+		};
+
+		segments = Math.max( 3, segments );
+
+		// buffers
+
+		const indices = [];
+		const vertices = [];
+		const normals = [];
+		const uvs = [];
+
+		// helper variables
+
+		const vertex = new Vector3();
+		const uv = new Vector2();
+
+		// center point
+
+		vertices.push( 0, 0, 0 );
+		normals.push( 0, 0, 1 );
+		uvs.push( 0.5, 0.5 );
+
+		for ( let s = 0, i = 3; s <= segments; s ++, i += 3 ) {
+
+			const segment = thetaStart + s / segments * thetaLength;
+
+			// vertex
+
+			vertex.x = radius * Math.cos( segment );
+			vertex.y = radius * Math.sin( segment );
+
+			vertices.push( vertex.x, vertex.y, vertex.z );
+
+			// normal
+
+			normals.push( 0, 0, 1 );
+
+			// uvs
+
+			uv.x = ( vertices[ i ] / radius + 1 ) / 2;
+			uv.y = ( vertices[ i + 1 ] / radius + 1 ) / 2;
+
+			uvs.push( uv.x, uv.y );
+
+		}
+
+		// indices
+
+		for ( let i = 1; i <= segments; i ++ ) {
+
+			indices.push( i, i + 1, 0 );
+
+		}
+
+		// build geometry
+
+		this.setIndex( indices );
+		this.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
+		this.setAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
+		this.setAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );
+
+	}
+
+	copy( source ) {
+
+		super.copy( source );
+
+		this.parameters = Object.assign( {}, source.parameters );
+
+		return this;
+
+	}
+
+	static fromJSON( data ) {
+
+		return new CircleGeometry( data.radius, data.segments, data.thetaStart, data.thetaLength );
+
+	}
+
+}
+
+
+export { CircleGeometry };