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site/game/node_modules/three/src/geometries/RingGeometry.js

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+import { BufferGeometry } from '../core/BufferGeometry.js';
+import { Float32BufferAttribute } from '../core/BufferAttribute.js';
+import { Vector2 } from '../math/Vector2.js';
+import { Vector3 } from '../math/Vector3.js';
+
+class RingGeometry extends BufferGeometry {
+
+	constructor( innerRadius = 0.5, outerRadius = 1, thetaSegments = 32, phiSegments = 1, thetaStart = 0, thetaLength = Math.PI * 2 ) {
+
+		super();
+
+		this.type = 'RingGeometry';
+
+		this.parameters = {
+			innerRadius: innerRadius,
+			outerRadius: outerRadius,
+			thetaSegments: thetaSegments,
+			phiSegments: phiSegments,
+			thetaStart: thetaStart,
+			thetaLength: thetaLength
+		};
+
+		thetaSegments = Math.max( 3, thetaSegments );
+		phiSegments = Math.max( 1, phiSegments );
+
+		// buffers
+
+		const indices = [];
+		const vertices = [];
+		const normals = [];
+		const uvs = [];
+
+		// some helper variables
+
+		let radius = innerRadius;
+		const radiusStep = ( ( outerRadius - innerRadius ) / phiSegments );
+		const vertex = new Vector3();
+		const uv = new Vector2();
+
+		// generate vertices, normals and uvs
+
+		for ( let j = 0; j <= phiSegments; j ++ ) {
+
+			for ( let i = 0; i <= thetaSegments; i ++ ) {
+
+				// values are generate from the inside of the ring to the outside
+
+				const segment = thetaStart + i / thetaSegments * 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 );
+
+				// uv
+
+				uv.x = ( vertex.x / outerRadius + 1 ) / 2;
+				uv.y = ( vertex.y / outerRadius + 1 ) / 2;
+
+				uvs.push( uv.x, uv.y );
+
+			}
+
+			// increase the radius for next row of vertices
+
+			radius += radiusStep;
+
+		}
+
+		// indices
+
+		for ( let j = 0; j < phiSegments; j ++ ) {
+
+			const thetaSegmentLevel = j * ( thetaSegments + 1 );
+
+			for ( let i = 0; i < thetaSegments; i ++ ) {
+
+				const segment = i + thetaSegmentLevel;
+
+				const a = segment;
+				const b = segment + thetaSegments + 1;
+				const c = segment + thetaSegments + 2;
+				const d = segment + 1;
+
+				// faces
+
+				indices.push( a, b, d );
+				indices.push( b, c, d );
+
+			}
+
+		}
+
+		// 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 RingGeometry( data.innerRadius, data.outerRadius, data.thetaSegments, data.phiSegments, data.thetaStart, data.thetaLength );
+
+	}
+
+}
+
+
+export { RingGeometry };