Spaces:
Running
Running
File size: 3,552 Bytes
6cd9596 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 |
/**
* @author Kaleb Murphy
* @author Mugen87 / https://github.com/Mugen87
*/
import { Geometry } from '../core/Geometry.js';
import { BufferGeometry } from '../core/BufferGeometry.js';
import { Float32BufferAttribute } from '../core/BufferAttribute.js';
import { Vector2 } from '../math/Vector2.js';
import { Vector3 } from '../math/Vector3.js';
// RingGeometry
function RingGeometry( innerRadius, outerRadius, thetaSegments, phiSegments, thetaStart, thetaLength ) {
Geometry.call( this );
this.type = 'RingGeometry';
this.parameters = {
innerRadius: innerRadius,
outerRadius: outerRadius,
thetaSegments: thetaSegments,
phiSegments: phiSegments,
thetaStart: thetaStart,
thetaLength: thetaLength
};
this.fromBufferGeometry( new RingBufferGeometry( innerRadius, outerRadius, thetaSegments, phiSegments, thetaStart, thetaLength ) );
this.mergeVertices();
}
RingGeometry.prototype = Object.create( Geometry.prototype );
RingGeometry.prototype.constructor = RingGeometry;
// RingBufferGeometry
function RingBufferGeometry( innerRadius, outerRadius, thetaSegments, phiSegments, thetaStart, thetaLength ) {
BufferGeometry.call( this );
this.type = 'RingBufferGeometry';
this.parameters = {
innerRadius: innerRadius,
outerRadius: outerRadius,
thetaSegments: thetaSegments,
phiSegments: phiSegments,
thetaStart: thetaStart,
thetaLength: thetaLength
};
innerRadius = innerRadius || 0.5;
outerRadius = outerRadius || 1;
thetaStart = thetaStart !== undefined ? thetaStart : 0;
thetaLength = thetaLength !== undefined ? thetaLength : Math.PI * 2;
thetaSegments = thetaSegments !== undefined ? Math.max( 3, thetaSegments ) : 8;
phiSegments = phiSegments !== undefined ? Math.max( 1, phiSegments ) : 1;
// buffers
var indices = [];
var vertices = [];
var normals = [];
var uvs = [];
// some helper variables
var segment;
var radius = innerRadius;
var radiusStep = ( ( outerRadius - innerRadius ) / phiSegments );
var vertex = new Vector3();
var uv = new Vector2();
var j, i;
// generate vertices, normals and uvs
for ( j = 0; j <= phiSegments; j ++ ) {
for ( i = 0; i <= thetaSegments; i ++ ) {
// values are generate from the inside of the ring to the outside
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 ( j = 0; j < phiSegments; j ++ ) {
var thetaSegmentLevel = j * ( thetaSegments + 1 );
for ( i = 0; i < thetaSegments; i ++ ) {
segment = i + thetaSegmentLevel;
var a = segment;
var b = segment + thetaSegments + 1;
var c = segment + thetaSegments + 2;
var d = segment + 1;
// faces
indices.push( a, b, d );
indices.push( b, c, d );
}
}
// build geometry
this.setIndex( indices );
this.addAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
this.addAttribute( 'normal', new Float32BufferAttribute( normals, 3 ) );
this.addAttribute( 'uv', new Float32BufferAttribute( uvs, 2 ) );
}
RingBufferGeometry.prototype = Object.create( BufferGeometry.prototype );
RingBufferGeometry.prototype.constructor = RingBufferGeometry;
export { RingGeometry, RingBufferGeometry };
|