Accueil / npm / three@0.186.1 / src / core / BufferGeometry.js
BufferGeometry.js
import { Vector3 } from '../math/Vector3.js';
import { Vector2 } from '../math/Vector2.js';
import { Box3 } from '../math/Box3.js';
import { EventDispatcher } from './EventDispatcher.js';
import { BufferAttribute, Float32BufferAttribute, Uint16BufferAttribute, Uint32BufferAttribute } from './BufferAttribute.js';
import { Sphere } from '../math/Sphere.js';
import { Object3D } from './Object3D.js';
import { Matrix4 } from '../math/Matrix4.js';
import { Matrix3 } from '../math/Matrix3.js';
import { generateUUID } from '../math/MathUtils.js';
import { arrayNeedsUint32, warn, error } from '../utils.js';
let _id = 0;
const _m1 = /*@__PURE__*/ new Matrix4();
const _obj = /*@__PURE__*/ new Object3D();
const _offset = /*@__PURE__*/ new Vector3();
const _box = /*@__PURE__*/ new Box3();
const _boxMorphTargets = /*@__PURE__*/ new Box3();
const _vector = /*@__PURE__*/ new Vector3();
/**
* A representation of mesh, line, or point geometry. Includes vertex
* positions, face indices, normals, colors, UVs, and custom attributes
* within buffers, reducing the cost of passing all this data to the GPU.
*
* ```js
* const geometry = new THREE.BufferGeometry();
* // create a simple square shape. We duplicate the top left and bottom right
* // vertices because each vertex needs to appear once per triangle.
* const vertices = new Float32Array( [
* -1.0, -1.0, 1.0, // v0
* 1.0, -1.0, 1.0, // v1
* 1.0, 1.0, 1.0, // v2
*
* 1.0, 1.0, 1.0, // v3
* -1.0, 1.0, 1.0, // v4
* -1.0, -1.0, 1.0 // v5
* ] );
* // itemSize = 3 because there are 3 values (components) per vertex
* geometry.setAttribute( 'position', new THREE.BufferAttribute( vertices, 3 ) );
* const material = new THREE.MeshBasicMaterial( { color: 0xff0000 } );
* const mesh = new THREE.Mesh( geometry, material );
* ```
*
* @augments EventDispatcher
*/
class BufferGeometry extends EventDispatcher {
/**
* Constructs a new geometry.
*/
constructor() {
super();
/**
* This flag can be used for type testing.
*
* @type {boolean}
* @readonly
* @default true
*/
this.isBufferGeometry = true;
/**
* The ID of the geometry.
*
* @name BufferGeometry#id
* @type {number}
* @readonly
*/
Object.defineProperty( this, 'id', { value: _id ++ } );
/**
* The UUID of the geometry.
*
* @type {string}
* @readonly
*/
this.uuid = generateUUID();
/**
* The name of the geometry.
*
* @type {string}
*/
this.name = '';
this.type = 'BufferGeometry';
/**
* Allows for vertices to be re-used across multiple triangles; this is
* called using "indexed triangles". Each triangle is associated with the
* indices of three vertices. This attribute therefore stores the index of
* each vertex for each triangular face. If this attribute is not set, the
* renderer assumes that each three contiguous positions represent a single triangle.
*
* @type {?BufferAttribute}
* @default null
*/
this.index = null;
/**
* A (storage) buffer attribute which was generated with a compute shader and
* now defines indirect draw calls.
*
* Can only be used with {@link WebGPURenderer} and a WebGPU backend.
*
* @type {?BufferAttribute}
* @default null
*/
this.indirect = null;
/**
* The offset, in bytes, into the indirect drawing buffer where the value data begins. If an array is provided, multiple indirect draw calls will be made for each offset.
*
* Can only be used with {@link WebGPURenderer} and a WebGPU backend.
*
* @type {number|Array<number>}
* @default 0
*/
this.indirectOffset = 0;
/**
* This dictionary has as id the name of the attribute to be set and as value
* the buffer attribute to set it to. Rather than accessing this property directly,
* use `setAttribute()` and `getAttribute()` to access attributes of this geometry.
*
* @type {Object<string,(BufferAttribute|InterleavedBufferAttribute)>}
*/
this.attributes = {};
/**
* This dictionary holds the morph targets of the geometry.
*
* Note: Once the geometry has been rendered, the morph attribute data cannot
* be changed. You will have to call `dispose()`, and create a new geometry instance.
*
* @type {Object}
*/
this.morphAttributes = {};
/**
* Used to control the morph target behavior; when set to `true`, the morph
* target data is treated as relative offsets, rather than as absolute
* positions/normals.
*
* @type {boolean}
* @default false
*/
this.morphTargetsRelative = false;
/**
* Split the geometry into groups, each of which will be rendered in a
* separate draw call. This allows an array of materials to be used with the geometry.
*
* Use `addGroup()` and `clearGroups()` to edit groups, rather than modifying this array directly.
*
* Every vertex and index must belong to exactly one group — groups must not share vertices or
* indices, and must not leave vertices or indices unused.
*
* @type {Array<Object>}
*/
this.groups = [];
/**
* Bounding box for the geometry which can be calculated with `computeBoundingBox()`.
*
* @type {?Box3}
* @default null
*/
this.boundingBox = null;
/**
* Bounding sphere for the geometry which can be calculated with `computeBoundingSphere()`.
*
* @type {?Sphere}
* @default null
*/
this.boundingSphere = null;
/**
* Determines the part of the geometry to render. This should not be set directly,
* instead use `setDrawRange()`.
*
* @type {{start:number,count:number}}
*/
this.drawRange = { start: 0, count: Infinity };
/**
* An object that can be used to store custom data about the geometry.
* It should not hold references to functions as these will not be cloned.
*
* @type {Object}
*/
this.userData = {};
/**
* `true` when the geometry has been transformed since construction
* (e.g. via {@link BufferGeometry#applyMatrix4}). Only relevant for
* geometry generators (subclasses that populate `parameters`): when set,
* {@link BufferGeometry#toJSON} omits `parameters` since they no longer
* describe the geometry.
*
* @private
* @type {boolean}
* @default false
*/
this._transformed = false;
}
/**
* Returns the index of this geometry.
*
* @return {?BufferAttribute} The index. Returns `null` if no index is defined.
*/
getIndex() {
return this.index;
}
/**
* Sets the given index to this geometry.
*
* @param {Array<number>|BufferAttribute} index - The index to set.
* @return {BufferGeometry} A reference to this instance.
*/
setIndex( index ) {
if ( Array.isArray( index ) ) {
this.index = new ( arrayNeedsUint32( index ) ? Uint32BufferAttribute : Uint16BufferAttribute )( index, 1 );
} else {
this.index = index;
}
return this;
}
/**
* Sets the given indirect attribute to this geometry.
*
* @param {BufferAttribute} indirect - The attribute holding indirect draw calls.
* @param {number|Array<number>} [indirectOffset=0] - The offset, in bytes, into the indirect drawing buffer where the value data begins. If an array is provided, multiple indirect draw calls will be made for each offset.
* @return {BufferGeometry} A reference to this instance.
*/
setIndirect( indirect, indirectOffset = 0 ) {
this.indirect = indirect;
this.indirectOffset = indirectOffset;
return this;
}
/**
* Returns the indirect attribute of this geometry.
*
* @return {?BufferAttribute} The indirect attribute. Returns `null` if no indirect attribute is defined.
*/
getIndirect() {
return this.indirect;
}
/**
* Returns the buffer attribute for the given name.
*
* @param {string} name - The attribute name.
* @return {BufferAttribute|InterleavedBufferAttribute|undefined} The buffer attribute.
* Returns `undefined` if not attribute has been found.
*/
getAttribute( name ) {
return this.attributes[ name ];
}
/**
* Sets the given attribute for the given name.
*
* @param {string} name - The attribute name.
* @param {BufferAttribute|InterleavedBufferAttribute} attribute - The attribute to set.
* @return {BufferGeometry} A reference to this instance.
*/
setAttribute( name, attribute ) {
this.attributes[ name ] = attribute;
return this;
}
/**
* Deletes the attribute for the given name.
*
* @param {string} name - The attribute name to delete.
* @return {BufferGeometry} A reference to this instance.
*/
deleteAttribute( name ) {
delete this.attributes[ name ];
return this;
}
/**
* Returns `true` if this geometry has an attribute for the given name.
*
* @param {string} name - The attribute name.
* @return {boolean} Whether this geometry has an attribute for the given name or not.
*/
hasAttribute( name ) {
return this.attributes[ name ] !== undefined;
}
/**
* Adds a group to this geometry.
*
* @param {number} start - The first element in this draw call. That is the first
* vertex for non-indexed geometry, otherwise the first triangle index.
* @param {number} count - Specifies how many vertices (or indices) are part of this group.
* @param {number} [materialIndex=0] - The material array index to use.
*/
addGroup( start, count, materialIndex = 0 ) {
this.groups.push( {
start: start,
count: count,
materialIndex: materialIndex
} );
}
/**
* Clears all groups.
*/
clearGroups() {
this.groups = [];
}
/**
* Sets the draw range for this geometry.
*
* @param {number} start - The first vertex for non-indexed geometry, otherwise the first triangle index.
* @param {number} count - For non-indexed BufferGeometry, `count` is the number of vertices to render.
* For indexed BufferGeometry, `count` is the number of indices to render.
*/
setDrawRange( start, count ) {
this.drawRange.start = start;
this.drawRange.count = count;
}
/**
* Applies the given 4x4 transformation matrix to the geometry.
*
* @param {Matrix4} matrix - The matrix to apply.
* @return {BufferGeometry} A reference to this instance.
*/
applyMatrix4( matrix ) {
const position = this.attributes.position;
if ( position !== undefined ) {
position.applyMatrix4( matrix );
position.needsUpdate = true;
}
const normal = this.attributes.normal;
if ( normal !== undefined ) {
const normalMatrix = new Matrix3().getNormalMatrix( matrix );
normal.applyNormalMatrix( normalMatrix );
normal.needsUpdate = true;
}
const tangent = this.attributes.tangent;
if ( tangent !== undefined ) {
tangent.transformDirection( matrix );
tangent.needsUpdate = true;
}
if ( this.boundingBox !== null ) {
this.computeBoundingBox();
}
if ( this.boundingSphere !== null ) {
this.computeBoundingSphere();
}
this._transformed = true;
return this;
}
/**
* Applies the rotation represented by the Quaternion to the geometry.
*
* @param {Quaternion} q - The Quaternion to apply.
* @return {BufferGeometry} A reference to this instance.
*/
applyQuaternion( q ) {
_m1.makeRotationFromQuaternion( q );
this.applyMatrix4( _m1 );
return this;
}
/**
* Rotates the geometry about the X axis. This is typically done as a one time
* operation, and not during a loop. Use {@link Object3D#rotation} for typical
* real-time mesh rotation.
*
* @param {number} angle - The angle in radians.
* @return {BufferGeometry} A reference to this instance.
*/
rotateX( angle ) {
// rotate geometry around world x-axis
_m1.makeRotationX( angle );
this.applyMatrix4( _m1 );
return this;
}
/**
* Rotates the geometry about the Y axis. This is typically done as a one time
* operation, and not during a loop. Use {@link Object3D#rotation} for typical
* real-time mesh rotation.
*
* @param {number} angle - The angle in radians.
* @return {BufferGeometry} A reference to this instance.
*/
rotateY( angle ) {
// rotate geometry around world y-axis
_m1.makeRotationY( angle );
this.applyMatrix4( _m1 );
return this;
}
/**
* Rotates the geometry about the Z axis. This is typically done as a one time
* operation, and not during a loop. Use {@link Object3D#rotation} for typical
* real-time mesh rotation.
*
* @param {number} angle - The angle in radians.
* @return {BufferGeometry} A reference to this instance.
*/
rotateZ( angle ) {
// rotate geometry around world z-axis
_m1.makeRotationZ( angle );
this.applyMatrix4( _m1 );
return this;
}
/**
* Translates the geometry. This is typically done as a one time
* operation, and not during a loop. Use {@link Object3D#position} for typical
* real-time mesh rotation.
*
* @param {number} x - The x offset.
* @param {number} y - The y offset.
* @param {number} z - The z offset.
* @return {BufferGeometry} A reference to this instance.
*/
translate( x, y, z ) {
// translate geometry
_m1.makeTranslation( x, y, z );
this.applyMatrix4( _m1 );
return this;
}
/**
* Scales the geometry. This is typically done as a one time
* operation, and not during a loop. Use {@link Object3D#scale} for typical
* real-time mesh rotation.
*
* @param {number} x - The x scale.
* @param {number} y - The y scale.
* @param {number} z - The z scale.
* @return {BufferGeometry} A reference to this instance.
*/
scale( x, y, z ) {
// scale geometry
_m1.makeScale( x, y, z );
this.applyMatrix4( _m1 );
return this;
}
/**
* Rotates the geometry to face a point in 3D space. This is typically done as a one time
* operation, and not during a loop. Use {@link Object3D#lookAt} for typical
* real-time mesh rotation.
*
* @param {Vector3} vector - The target point.
* @return {BufferGeometry} A reference to this instance.
*/
lookAt( vector ) {
_obj.lookAt( vector );
_obj.updateMatrix();
this.applyMatrix4( _obj.matrix );
return this;
}
/**
* Center the geometry based on its bounding box.
*
* @return {BufferGeometry} A reference to this instance.
*/
center() {
this.computeBoundingBox();
this.boundingBox.getCenter( _offset ).negate();
this.translate( _offset.x, _offset.y, _offset.z );
return this;
}
/**
* Defines a geometry by creating a `position` attribute based on the given array of points. The array
* can hold 2D or 3D vectors. When using two-dimensional data, the `z` coordinate for all vertices is
* set to `0`.
*
* If the method is used with an existing `position` attribute, the vertex data are overwritten with the
* data from the array. The length of the array must match the vertex count.
*
* @param {Array<Vector2>|Array<Vector3>} points - The points.
* @return {BufferGeometry} A reference to this instance.
*/
setFromPoints( points ) {
const positionAttribute = this.getAttribute( 'position' );
if ( positionAttribute === undefined ) {
const position = [];
for ( let i = 0, l = points.length; i < l; i ++ ) {
const point = points[ i ];
position.push( point.x, point.y, point.z || 0 );
}
this.setAttribute( 'position', new Float32BufferAttribute( position, 3 ) );
} else {
const l = Math.min( points.length, positionAttribute.count ); // make sure data do not exceed buffer size
for ( let i = 0; i < l; i ++ ) {
const point = points[ i ];
positionAttribute.setXYZ( i, point.x, point.y, point.z || 0 );
}
if ( points.length > positionAttribute.count ) {
warn( 'BufferGeometry: Buffer size too small for points data. Use .dispose() and create a new geometry.' );
}
positionAttribute.needsUpdate = true;
}
return this;
}
/**
* Computes the bounding box of the geometry, and updates the `boundingBox` member.
* The bounding box is not computed by the engine; it must be computed by your app.
* You may need to recompute the bounding box if the geometry vertices are modified.
*/
computeBoundingBox() {
if ( this.boundingBox === null ) {
this.boundingBox = new Box3();
}
const position = this.attributes.position;
const morphAttributesPosition = this.morphAttributes.position;
if ( position && position.isGLBufferAttribute ) {
error( 'BufferGeometry.computeBoundingBox(): GLBufferAttribute requires a manual bounding box.', this );
this.boundingBox.set(
new Vector3( - Infinity, - Infinity, - Infinity ),
new Vector3( + Infinity, + Infinity, + Infinity )
);
return;
}
if ( position !== undefined ) {
this.boundingBox.setFromBufferAttribute( position );
// process morph attributes if present
if ( morphAttributesPosition ) {
for ( let i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {
const morphAttribute = morphAttributesPosition[ i ];
_box.setFromBufferAttribute( morphAttribute );
if ( this.morphTargetsRelative ) {
_vector.addVectors( this.boundingBox.min, _box.min );
this.boundingBox.expandByPoint( _vector );
_vector.addVectors( this.boundingBox.max, _box.max );
this.boundingBox.expandByPoint( _vector );
} else {
this.boundingBox.expandByPoint( _box.min );
this.boundingBox.expandByPoint( _box.max );
}
}
}
} else {
this.boundingBox.makeEmpty();
}
if ( isNaN( this.boundingBox.min.x ) || isNaN( this.boundingBox.min.y ) || isNaN( this.boundingBox.min.z ) ) {
error( 'BufferGeometry.computeBoundingBox(): Computed min/max have NaN values. The "position" attribute is likely to have NaN values.', this );
}
}
/**
* Computes the bounding sphere of the geometry, and updates the `boundingSphere` member.
* The engine automatically computes the bounding sphere when it is needed, e.g., for ray casting or view frustum culling.
* You may need to recompute the bounding sphere if the geometry vertices are modified.
*/
computeBoundingSphere() {
if ( this.boundingSphere === null ) {
this.boundingSphere = new Sphere();
}
const position = this.attributes.position;
const morphAttributesPosition = this.morphAttributes.position;
if ( position && position.isGLBufferAttribute ) {
error( 'BufferGeometry.computeBoundingSphere(): GLBufferAttribute requires a manual bounding sphere.', this );
this.boundingSphere.set( new Vector3(), Infinity );
return;
}
if ( position ) {
// first, find the center of the bounding sphere
const center = this.boundingSphere.center;
_box.setFromBufferAttribute( position );
// process morph attributes if present
if ( morphAttributesPosition ) {
for ( let i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {
const morphAttribute = morphAttributesPosition[ i ];
_boxMorphTargets.setFromBufferAttribute( morphAttribute );
if ( this.morphTargetsRelative ) {
_vector.addVectors( _box.min, _boxMorphTargets.min );
_box.expandByPoint( _vector );
_vector.addVectors( _box.max, _boxMorphTargets.max );
_box.expandByPoint( _vector );
} else {
_box.expandByPoint( _boxMorphTargets.min );
_box.expandByPoint( _boxMorphTargets.max );
}
}
}
_box.getCenter( center );
// second, try to find a boundingSphere with a radius smaller than the
// boundingSphere of the boundingBox: sqrt(3) smaller in the best case
let maxRadiusSq = 0;
for ( let i = 0, il = position.count; i < il; i ++ ) {
_vector.fromBufferAttribute( position, i );
maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( _vector ) );
}
// process morph attributes if present
if ( morphAttributesPosition ) {
for ( let i = 0, il = morphAttributesPosition.length; i < il; i ++ ) {
const morphAttribute = morphAttributesPosition[ i ];
const morphTargetsRelative = this.morphTargetsRelative;
for ( let j = 0, jl = morphAttribute.count; j < jl; j ++ ) {
_vector.fromBufferAttribute( morphAttribute, j );
if ( morphTargetsRelative ) {
_offset.fromBufferAttribute( position, j );
_vector.add( _offset );
}
maxRadiusSq = Math.max( maxRadiusSq, center.distanceToSquared( _vector ) );
}
}
}
this.boundingSphere.radius = Math.sqrt( maxRadiusSq );
if ( isNaN( this.boundingSphere.radius ) ) {
error( 'BufferGeometry.computeBoundingSphere(): Computed radius is NaN. The "position" attribute is likely to have NaN values.', this );
}
}
}
/**
* Calculates and adds a tangent attribute to this geometry.
*
* The computation is only supported for indexed geometries and if position, normal, and uv attributes
* are defined. When using a tangent space normal map, prefer the MikkTSpace algorithm provided by
* {@link BufferGeometryUtils#computeMikkTSpaceTangents} instead.
*/
computeTangents() {
const index = this.index;
const attributes = this.attributes;
// based on http://www.terathon.com/code/tangent.html
// (per vertex tangents)
if ( index === null ||
attributes.position === undefined ||
attributes.normal === undefined ||
attributes.uv === undefined ) {
error( 'BufferGeometry: .computeTangents() failed. Missing required attributes (index, position, normal or uv)' );
return;
}
const positionAttribute = attributes.position;
const normalAttribute = attributes.normal;
const uvAttribute = attributes.uv;
let tangentAttribute = this.getAttribute( 'tangent' );
if ( tangentAttribute === undefined || tangentAttribute.count !== positionAttribute.count ) {
tangentAttribute = new BufferAttribute( new Float32Array( 4 * positionAttribute.count ), 4 );
this.setAttribute( 'tangent', tangentAttribute );
}
const tan1 = [], tan2 = [];
for ( let i = 0; i < positionAttribute.count; i ++ ) {
tan1[ i ] = new Vector3();
tan2[ i ] = new Vector3();
}
const vA = new Vector3(),
vB = new Vector3(),
vC = new Vector3(),
uvA = new Vector2(),
uvB = new Vector2(),
uvC = new Vector2(),
sdir = new Vector3(),
tdir = new Vector3();
function handleTriangle( a, b, c ) {
vA.fromBufferAttribute( positionAttribute, a );
vB.fromBufferAttribute( positionAttribute, b );
vC.fromBufferAttribute( positionAttribute, c );
uvA.fromBufferAttribute( uvAttribute, a );
uvB.fromBufferAttribute( uvAttribute, b );
uvC.fromBufferAttribute( uvAttribute, c );
vB.sub( vA );
vC.sub( vA );
uvB.sub( uvA );
uvC.sub( uvA );
const r = 1.0 / ( uvB.x * uvC.y - uvC.x * uvB.y );
// silently ignore degenerate uv triangles having coincident or colinear vertices
if ( ! isFinite( r ) ) return;
sdir.copy( vB ).multiplyScalar( uvC.y ).addScaledVector( vC, - uvB.y ).multiplyScalar( r );
tdir.copy( vC ).multiplyScalar( uvB.x ).addScaledVector( vB, - uvC.x ).multiplyScalar( r );
tan1[ a ].add( sdir );
tan1[ b ].add( sdir );
tan1[ c ].add( sdir );
tan2[ a ].add( tdir );
tan2[ b ].add( tdir );
tan2[ c ].add( tdir );
}
let groups = this.groups;
if ( groups.length === 0 ) {
groups = [ {
start: 0,
count: index.count
} ];
}
for ( let i = 0, il = groups.length; i < il; ++ i ) {
const group = groups[ i ];
const start = group.start;
const count = group.count;
for ( let j = start, jl = start + count; j < jl; j += 3 ) {
handleTriangle(
index.getX( j + 0 ),
index.getX( j + 1 ),
index.getX( j + 2 )
);
}
}
const tmp = new Vector3(), tmp2 = new Vector3();
const n = new Vector3(), n2 = new Vector3();
function handleVertex( v ) {
n.fromBufferAttribute( normalAttribute, v );
n2.copy( n );
const t = tan1[ v ];
// Gram-Schmidt orthogonalize
tmp.copy( t );
tmp.sub( n.multiplyScalar( n.dot( t ) ) ).normalize();
// Calculate handedness
tmp2.crossVectors( n2, t );
const test = tmp2.dot( tan2[ v ] );
const w = ( test < 0.0 ) ? - 1.0 : 1.0;
tangentAttribute.setXYZW( v, tmp.x, tmp.y, tmp.z, w );
}
for ( let i = 0, il = groups.length; i < il; ++ i ) {
const group = groups[ i ];
const start = group.start;
const count = group.count;
for ( let j = start, jl = start + count; j < jl; j += 3 ) {
handleVertex( index.getX( j + 0 ) );
handleVertex( index.getX( j + 1 ) );
handleVertex( index.getX( j + 2 ) );
}
}
this._transformed = true;
}
/**
* Computes vertex normals for the given vertex data. For indexed geometries, the method sets
* each vertex normal to be the average of the face normals of the faces that share that vertex.
* For non-indexed geometries, vertices are not shared, and the method sets each vertex normal
* to be the same as the face normal.
*/
computeVertexNormals() {
const index = this.index;
const positionAttribute = this.getAttribute( 'position' );
if ( positionAttribute !== undefined ) {
let normalAttribute = this.getAttribute( 'normal' );
if ( normalAttribute === undefined || normalAttribute.count !== positionAttribute.count ) {
normalAttribute = new BufferAttribute( new Float32Array( positionAttribute.count * 3 ), 3 );
this.setAttribute( 'normal', normalAttribute );
} else {
// reset existing normals to zero
for ( let i = 0, il = normalAttribute.count; i < il; i ++ ) {
normalAttribute.setXYZ( i, 0, 0, 0 );
}
}
const pA = new Vector3(), pB = new Vector3(), pC = new Vector3();
const nA = new Vector3(), nB = new Vector3(), nC = new Vector3();
const cb = new Vector3(), ab = new Vector3();
// indexed elements
if ( index ) {
for ( let i = 0, il = index.count; i < il; i += 3 ) {
const vA = index.getX( i + 0 );
const vB = index.getX( i + 1 );
const vC = index.getX( i + 2 );
pA.fromBufferAttribute( positionAttribute, vA );
pB.fromBufferAttribute( positionAttribute, vB );
pC.fromBufferAttribute( positionAttribute, vC );
cb.subVectors( pC, pB );
ab.subVectors( pA, pB );
cb.cross( ab );
nA.fromBufferAttribute( normalAttribute, vA );
nB.fromBufferAttribute( normalAttribute, vB );
nC.fromBufferAttribute( normalAttribute, vC );
nA.add( cb );
nB.add( cb );
nC.add( cb );
normalAttribute.setXYZ( vA, nA.x, nA.y, nA.z );
normalAttribute.setXYZ( vB, nB.x, nB.y, nB.z );
normalAttribute.setXYZ( vC, nC.x, nC.y, nC.z );
}
} else {
// non-indexed elements (unconnected triangle soup)
for ( let i = 0, il = positionAttribute.count; i < il; i += 3 ) {
pA.fromBufferAttribute( positionAttribute, i + 0 );
pB.fromBufferAttribute( positionAttribute, i + 1 );
pC.fromBufferAttribute( positionAttribute, i + 2 );
cb.subVectors( pC, pB );
ab.subVectors( pA, pB );
cb.cross( ab );
normalAttribute.setXYZ( i + 0, cb.x, cb.y, cb.z );
normalAttribute.setXYZ( i + 1, cb.x, cb.y, cb.z );
normalAttribute.setXYZ( i + 2, cb.x, cb.y, cb.z );
}
}
this.normalizeNormals();
normalAttribute.needsUpdate = true;
}
}
/**
* Ensures every normal vector in a geometry will have a magnitude of `1`. This will
* correct lighting on the geometry surfaces.
*/
normalizeNormals() {
const normals = this.attributes.normal;
for ( let i = 0, il = normals.count; i < il; i ++ ) {
_vector.fromBufferAttribute( normals, i );
_vector.normalize();
normals.setXYZ( i, _vector.x, _vector.y, _vector.z );
}
}
/**
* Return a new non-index version of this indexed geometry. If the geometry
* is already non-indexed, the method is a NOOP.
*
* @return {BufferGeometry} The non-indexed version of this indexed geometry.
*/
toNonIndexed() {
function convertBufferAttribute( attribute, indices ) {
const array = attribute.array;
const itemSize = attribute.itemSize;
const normalized = attribute.normalized;
const array2 = new array.constructor( indices.length * itemSize );
let index = 0, index2 = 0;
for ( let i = 0, l = indices.length; i < l; i ++ ) {
if ( attribute.isInterleavedBufferAttribute ) {
index = indices[ i ] * attribute.data.stride + attribute.offset;
} else {
index = indices[ i ] * itemSize;
}
for ( let j = 0; j < itemSize; j ++ ) {
array2[ index2 ++ ] = array[ index ++ ];
}
}
return new BufferAttribute( array2, itemSize, normalized );
}
//
if ( this.index === null ) {
warn( 'BufferGeometry.toNonIndexed(): BufferGeometry is already non-indexed.' );
return this;
}
const geometry2 = new BufferGeometry();
const indices = this.index.array;
const attributes = this.attributes;
// attributes
for ( const name in attributes ) {
const attribute = attributes[ name ];
const newAttribute = convertBufferAttribute( attribute, indices );
geometry2.setAttribute( name, newAttribute );
}
// morph attributes
const morphAttributes = this.morphAttributes;
for ( const name in morphAttributes ) {
const morphArray = [];
const morphAttribute = morphAttributes[ name ]; // morphAttribute: array of Float32BufferAttributes
for ( let i = 0, il = morphAttribute.length; i < il; i ++ ) {
const attribute = morphAttribute[ i ];
const newAttribute = convertBufferAttribute( attribute, indices );
morphArray.push( newAttribute );
}
geometry2.morphAttributes[ name ] = morphArray;
}
geometry2.morphTargetsRelative = this.morphTargetsRelative;
// groups
const groups = this.groups;
for ( let i = 0, l = groups.length; i < l; i ++ ) {
const group = groups[ i ];
geometry2.addGroup( group.start, group.count, group.materialIndex );
}
return geometry2;
}
/**
* Serializes the geometry into JSON.
*
* @return {Object} A JSON object representing the serialized geometry.
*/
toJSON() {
const data = {
metadata: {
version: 4.7,
type: 'BufferGeometry',
generator: 'BufferGeometry.toJSON'
}
};
// standard BufferGeometry serialization
data.uuid = this.uuid;
data.type = ( this.parameters !== undefined && this._transformed === true ) ? 'BufferGeometry' : this.type;
data.name = this.name;
if ( Object.keys( this.userData ).length > 0 ) data.userData = this.userData;
if ( this.parameters !== undefined && this._transformed !== true ) {
const parameters = this.parameters;
for ( const key in parameters ) {
if ( parameters[ key ] !== undefined ) data[ key ] = parameters[ key ];
}
return data;
}
// for simplicity the code assumes attributes are not shared across geometries, see #15811
data.data = { attributes: {} };
const index = this.index;
if ( index !== null ) {
data.data.index = {
type: index.array.constructor.name,
array: Array.prototype.slice.call( index.array )
};
}
const attributes = this.attributes;
for ( const key in attributes ) {
const attribute = attributes[ key ];
data.data.attributes[ key ] = attribute.toJSON( data.data );
}
const morphAttributes = {};
let hasMorphAttributes = false;
for ( const key in this.morphAttributes ) {
const attributeArray = this.morphAttributes[ key ];
const array = [];
for ( let i = 0, il = attributeArray.length; i < il; i ++ ) {
const attribute = attributeArray[ i ];
array.push( attribute.toJSON( data.data ) );
}
if ( array.length > 0 ) {
morphAttributes[ key ] = array;
hasMorphAttributes = true;
}
}
if ( hasMorphAttributes ) {
data.data.morphAttributes = morphAttributes;
data.data.morphTargetsRelative = this.morphTargetsRelative;
}
const groups = this.groups;
if ( groups.length > 0 ) {
data.data.groups = JSON.parse( JSON.stringify( groups ) );
}
const boundingSphere = this.boundingSphere;
if ( boundingSphere !== null ) {
data.data.boundingSphere = boundingSphere.toJSON();
}
return data;
}
/**
* Returns a new geometry with copied values from this instance.
*
* @return {BufferGeometry} A clone of this instance.
*/
clone() {
return new this.constructor().copy( this );
}
/**
* Copies the values of the given geometry to this instance.
*
* @param {BufferGeometry} source - The geometry to copy.
* @return {BufferGeometry} A reference to this instance.
*/
copy( source ) {
// reset
this.index = null;
this.attributes = {};
this.morphAttributes = {};
this.groups = [];
this.boundingBox = null;
this.boundingSphere = null;
// used for storing cloned, shared data
const data = {};
// name
this.name = source.name;
// index
const index = source.index;
if ( index !== null ) {
this.setIndex( index.clone() );
}
// attributes
const attributes = source.attributes;
for ( const name in attributes ) {
const attribute = attributes[ name ];
this.setAttribute( name, attribute.clone( data ) );
}
// morph attributes
const morphAttributes = source.morphAttributes;
for ( const name in morphAttributes ) {
const array = [];
const morphAttribute = morphAttributes[ name ]; // morphAttribute: array of Float32BufferAttributes
for ( let i = 0, l = morphAttribute.length; i < l; i ++ ) {
array.push( morphAttribute[ i ].clone( data ) );
}
this.morphAttributes[ name ] = array;
}
this.morphTargetsRelative = source.morphTargetsRelative;
// groups
const groups = source.groups;
for ( let i = 0, l = groups.length; i < l; i ++ ) {
const group = groups[ i ];
this.addGroup( group.start, group.count, group.materialIndex );
}
// bounding box
const boundingBox = source.boundingBox;
if ( boundingBox !== null ) {
this.boundingBox = boundingBox.clone();
}
// bounding sphere
const boundingSphere = source.boundingSphere;
if ( boundingSphere !== null ) {
this.boundingSphere = boundingSphere.clone();
}
// draw range
this.drawRange.start = source.drawRange.start;
this.drawRange.count = source.drawRange.count;
// user data
this.userData = source.userData;
// transformed flag
this._transformed = source._transformed;
return this;
}
/**
* Frees the GPU-related resources allocated by this instance. Call this
* method whenever this instance is no longer used in your app.
*
* @fires BufferGeometry#dispose
*/
dispose() {
this.dispatchEvent( { type: 'dispose' } );
}
}
export { BufferGeometry };