File size: 1,999 Bytes
b797337 | 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 | import { BufferGeometry } from '../core/BufferGeometry.js';
import { Float32BufferAttribute } from '../core/BufferAttribute.js';
class PlaneGeometry extends BufferGeometry {
constructor( width = 1, height = 1, widthSegments = 1, heightSegments = 1 ) {
super();
this.type = 'PlaneGeometry';
this.parameters = {
width: width,
height: height,
widthSegments: widthSegments,
heightSegments: heightSegments
};
const width_half = width / 2;
const height_half = height / 2;
const gridX = Math.floor( widthSegments );
const gridY = Math.floor( heightSegments );
const gridX1 = gridX + 1;
const gridY1 = gridY + 1;
const segment_width = width / gridX;
const segment_height = height / gridY;
//
const indices = [];
const vertices = [];
const normals = [];
const uvs = [];
for ( let iy = 0; iy < gridY1; iy ++ ) {
const y = iy * segment_height - height_half;
for ( let ix = 0; ix < gridX1; ix ++ ) {
const x = ix * segment_width - width_half;
vertices.push( x, - y, 0 );
normals.push( 0, 0, 1 );
uvs.push( ix / gridX );
uvs.push( 1 - ( iy / gridY ) );
}
}
for ( let iy = 0; iy < gridY; iy ++ ) {
for ( let ix = 0; ix < gridX; ix ++ ) {
const a = ix + gridX1 * iy;
const b = ix + gridX1 * ( iy + 1 );
const c = ( ix + 1 ) + gridX1 * ( iy + 1 );
const d = ( ix + 1 ) + gridX1 * iy;
indices.push( a, b, d );
indices.push( b, c, d );
}
}
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 PlaneGeometry( data.width, data.height, data.widthSegments, data.heightSegments );
}
}
export { PlaneGeometry };
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