97 lines
1.8 KiB
JavaScript
97 lines
1.8 KiB
JavaScript
|
import {
|
||
|
|
BufferGeometry,
|
||
|
|
Float32BufferAttribute,
|
||
|
|
LineSegments,
|
||
|
|
LineBasicMaterial,
|
||
|
|
Matrix3,
|
||
|
|
Vector3
|
||
|
|
} from 'three';
|
||
|
|
|
||
|
|
const _v1 = new Vector3();
|
||
|
|
const _v2 = new Vector3();
|
||
|
|
const _normalMatrix = new Matrix3();
|
||
|
|
|
||
|
|
class VertexNormalsHelper extends LineSegments {
|
||
|
|
|
||
|
|
constructor( object, size = 1, color = 0xff0000 ) {
|
||
|
|
|
||
|
|
const geometry = new BufferGeometry();
|
||
|
|
|
||
|
|
const nNormals = object.geometry.attributes.normal.count;
|
||
|
|
const positions = new Float32BufferAttribute( nNormals * 2 * 3, 3 );
|
||
|
|
|
||
|
|
geometry.setAttribute( 'position', positions );
|
||
|
|
|
||
|
|
super( geometry, new LineBasicMaterial( { color, toneMapped: false } ) );
|
||
|
|
|
||
|
|
this.object = object;
|
||
|
|
this.size = size;
|
||
|
|
this.type = 'VertexNormalsHelper';
|
||
|
|
|
||
|
|
//
|
||
|
|
|
||
|
|
this.matrixAutoUpdate = false;
|
||
|
|
|
||
|
|
this.update();
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
update() {
|
||
|
|
|
||
|
|
this.object.updateMatrixWorld( true );
|
||
|
|
|
||
|
|
_normalMatrix.getNormalMatrix( this.object.matrixWorld );
|
||
|
|
|
||
|
|
const matrixWorld = this.object.matrixWorld;
|
||
|
|
|
||
|
|
const position = this.geometry.attributes.position;
|
||
|
|
|
||
|
|
//
|
||
|
|
|
||
|
|
const objGeometry = this.object.geometry;
|
||
|
|
|
||
|
|
if ( objGeometry ) {
|
||
|
|
|
||
|
|
const objPos = objGeometry.attributes.position;
|
||
|
|
|
||
|
|
const objNorm = objGeometry.attributes.normal;
|
||
|
|
|
||
|
|
let idx = 0;
|
||
|
|
|
||
|
|
// for simplicity, ignore index and drawcalls, and render every normal
|
||
|
|
|
||
|
|
for ( let j = 0, jl = objPos.count; j < jl; j ++ ) {
|
||
|
|
|
||
|
|
_v1.fromBufferAttribute( objPos, j ).applyMatrix4( matrixWorld );
|
||
|
|
|
||
|
|
_v2.fromBufferAttribute( objNorm, j );
|
||
|
|
|
||
|
|
_v2.applyMatrix3( _normalMatrix ).normalize().multiplyScalar( this.size ).add( _v1 );
|
||
|
|
|
||
|
|
position.setXYZ( idx, _v1.x, _v1.y, _v1.z );
|
||
|
|
|
||
|
|
idx = idx + 1;
|
||
|
|
|
||
|
|
position.setXYZ( idx, _v2.x, _v2.y, _v2.z );
|
||
|
|
|
||
|
|
idx = idx + 1;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
position.needsUpdate = true;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
dispose() {
|
||
|
|
|
||
|
|
this.geometry.dispose();
|
||
|
|
this.material.dispose();
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
export { VertexNormalsHelper };
|