96 lines
2.3 KiB
JavaScript
96 lines
2.3 KiB
JavaScript
/**
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* @author mrdoob / http://mrdoob.com/
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* based on http://papervision3d.googlecode.com/svn/trunk/as3/trunk/src/org/papervision3d/objects/primitives/Plane.as
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*/
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THREE.PlaneBufferGeometry = function ( width, height, widthSegments, heightSegments ) {
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THREE.BufferGeometry.call( this );
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this.type = 'PlaneBufferGeometry';
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this.parameters = {
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width: width,
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height: height,
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widthSegments: widthSegments,
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heightSegments: heightSegments
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};
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var width_half = width / 2;
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var height_half = height / 2;
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var gridX = widthSegments || 1;
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var gridY = heightSegments || 1;
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var gridX1 = gridX + 1;
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var gridY1 = gridY + 1;
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var segment_width = width / gridX;
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var segment_height = height / gridY;
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var vertices = new Float32Array( gridX1 * gridY1 * 3 );
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var normals = new Float32Array( gridX1 * gridY1 * 3 );
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var uvs = new Float32Array( gridX1 * gridY1 * 2 );
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var offset = 0;
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var offset2 = 0;
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for ( var iy = 0; iy < gridY1; iy ++ ) {
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var y = iy * segment_height - height_half;
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for ( var ix = 0; ix < gridX1; ix ++ ) {
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var x = ix * segment_width - width_half;
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vertices[ offset ] = x;
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vertices[ offset + 1 ] = - y;
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normals[ offset + 2 ] = 1;
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uvs[ offset2 ] = ix / gridX;
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uvs[ offset2 + 1 ] = 1 - ( iy / gridY );
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offset += 3;
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offset2 += 2;
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}
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}
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offset = 0;
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var indices = new ( ( vertices.length / 3 ) > 65535 ? Uint32Array : Uint16Array )( gridX * gridY * 6 );
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for ( var iy = 0; iy < gridY; iy ++ ) {
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for ( var ix = 0; ix < gridX; ix ++ ) {
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var a = ix + gridX1 * iy;
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var b = ix + gridX1 * ( iy + 1 );
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var c = ( ix + 1 ) + gridX1 * ( iy + 1 );
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var d = ( ix + 1 ) + gridX1 * iy;
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indices[ offset ] = a;
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indices[ offset + 1 ] = b;
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indices[ offset + 2 ] = d;
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indices[ offset + 3 ] = b;
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indices[ offset + 4 ] = c;
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indices[ offset + 5 ] = d;
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offset += 6;
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}
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}
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this.addAttribute( 'index', new THREE.BufferAttribute( indices, 1 ) );
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this.addAttribute( 'position', new THREE.BufferAttribute( vertices, 3 ) );
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this.addAttribute( 'normal', new THREE.BufferAttribute( normals, 3 ) );
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this.addAttribute( 'uv', new THREE.BufferAttribute( uvs, 2 ) );
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};
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THREE.PlaneBufferGeometry.prototype = Object.create( THREE.BufferGeometry.prototype );
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THREE.PlaneBufferGeometry.prototype.constructor = THREE.PlaneBufferGeometry;
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