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Sprite.js
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Sprite.js
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import { Vector2 } from '../math/Vector2.js';
import { Vector3 } from '../math/Vector3.js';
import { Matrix4 } from '../math/Matrix4.js';
import { Triangle } from '../math/Triangle.js';
import { Object3D } from '../core/Object3D.js';
import { BufferGeometry } from '../core/BufferGeometry.js';
import { InterleavedBuffer } from '../core/InterleavedBuffer.js';
import { InterleavedBufferAttribute } from '../core/InterleavedBufferAttribute.js';
import { SpriteMaterial } from '../materials/SpriteMaterial.js';
let _geometry;
const _intersectPoint = new Vector3();
const _worldScale = new Vector3();
const _mvPosition = new Vector3();
const _alignedPosition = new Vector2();
const _rotatedPosition = new Vector2();
const _viewWorldMatrix = new Matrix4();
const _vA = new Vector3();
const _vB = new Vector3();
const _vC = new Vector3();
const _uvA = new Vector2();
const _uvB = new Vector2();
const _uvC = new Vector2();
function Sprite( material ) {
Object3D.call( this );
this.type = 'Sprite';
if ( _geometry === undefined ) {
_geometry = new BufferGeometry();
const float32Array = new Float32Array( [
- 0.5, - 0.5, 0, 0, 0,
0.5, - 0.5, 0, 1, 0,
0.5, 0.5, 0, 1, 1,
- 0.5, 0.5, 0, 0, 1
] );
const interleavedBuffer = new InterleavedBuffer( float32Array, 5 );
_geometry.setIndex( [ 0, 1, 2, 0, 2, 3 ] );
_geometry.setAttribute( 'position', new InterleavedBufferAttribute( interleavedBuffer, 3, 0, false ) );
_geometry.setAttribute( 'uv', new InterleavedBufferAttribute( interleavedBuffer, 2, 3, false ) );
}
this.geometry = _geometry;
this.material = ( material !== undefined ) ? material : new SpriteMaterial();
this.center = new Vector2( 0.5, 0.5 );
}
Sprite.prototype = Object.assign( Object.create( Object3D.prototype ), {
constructor: Sprite,
isSprite: true,
raycast: function ( raycaster, intersects ) {
if ( raycaster.camera === null ) {
console.error( 'THREE.Sprite: "Raycaster.camera" needs to be set in order to raycast against sprites.' );
}
_worldScale.setFromMatrixScale( this.matrixWorld );
_viewWorldMatrix.copy( raycaster.camera.matrixWorld );
this.modelViewMatrix.multiplyMatrices( raycaster.camera.matrixWorldInverse, this.matrixWorld );
_mvPosition.setFromMatrixPosition( this.modelViewMatrix );
if ( raycaster.camera.isPerspectiveCamera && this.material.sizeAttenuation === false ) {
_worldScale.multiplyScalar( - _mvPosition.z );
}
const rotation = this.material.rotation;
let sin, cos;
if ( rotation !== 0 ) {
cos = Math.cos( rotation );
sin = Math.sin( rotation );
}
const center = this.center;
transformVertex( _vA.set( - 0.5, - 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );
transformVertex( _vB.set( 0.5, - 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );
transformVertex( _vC.set( 0.5, 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );
_uvA.set( 0, 0 );
_uvB.set( 1, 0 );
_uvC.set( 1, 1 );
// check first triangle
let intersect = raycaster.ray.intersectTriangle( _vA, _vB, _vC, false, _intersectPoint );
if ( intersect === null ) {
// check second triangle
transformVertex( _vB.set( - 0.5, 0.5, 0 ), _mvPosition, center, _worldScale, sin, cos );
_uvB.set( 0, 1 );
intersect = raycaster.ray.intersectTriangle( _vA, _vC, _vB, false, _intersectPoint );
if ( intersect === null ) {
return;
}
}
const distance = raycaster.ray.origin.distanceTo( _intersectPoint );
if ( distance < raycaster.near || distance > raycaster.far ) return;
intersects.push( {
distance: distance,
point: _intersectPoint.clone(),
uv: Triangle.getUV( _intersectPoint, _vA, _vB, _vC, _uvA, _uvB, _uvC, new Vector2() ),
face: null,
object: this
} );
},
copy: function ( source ) {
Object3D.prototype.copy.call( this, source );
if ( source.center !== undefined ) this.center.copy( source.center );
this.material = source.material;
return this;
}
} );
function transformVertex( vertexPosition, mvPosition, center, scale, sin, cos ) {
// compute position in camera space
_alignedPosition.subVectors( vertexPosition, center ).addScalar( 0.5 ).multiply( scale );
// to check if rotation is not zero
if ( sin !== undefined ) {
_rotatedPosition.x = ( cos * _alignedPosition.x ) - ( sin * _alignedPosition.y );
_rotatedPosition.y = ( sin * _alignedPosition.x ) + ( cos * _alignedPosition.y );
} else {
_rotatedPosition.copy( _alignedPosition );
}
vertexPosition.copy( mvPosition );
vertexPosition.x += _rotatedPosition.x;
vertexPosition.y += _rotatedPosition.y;
// transform to world space
vertexPosition.applyMatrix4( _viewWorldMatrix );
}
export { Sprite };