@ulb-darmstadt/photogrammetry-viewer/dist/photogrammetry-viewer.js

```console npm i photogrammetry-viewer ``` This library provides an HTML web component that displays photogrammetric data. The component consists of a combined 3D and 2D viewer. For each view of the 3D model, the 2D image closest to the view is loaded. Fo

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this._workingColorSpace},set workingColorSpace(e){if(!on.has(e))throw new Error(`Unsupported working color space, "${e}".`);this._workingColorSpace=e},convert:function(e,t,i){if(!1===this.enabled||t===i||!t||!i)return e;const n=nn[t].toReference;return(0,nn[i].fromReference)(n(e))},fromWorkingColorSpace:function(e,t){return this.convert(e,this._workingColorSpace,t)},toWorkingColorSpace:function(e,t){return this.convert(e,t,this._workingColorSpace)},getPrimaries:function(e){return nn[e].primaries},getTransfer:function(e){return e===ui?mi:nn[e].transfer},getLuminanceCoefficients:function(e,t=this._workingColorSpace){return e.fromArray(nn[t].luminanceCoefficients)}};function sn(e){return e<.04045?.0773993808*e:Math.pow(.9478672986*e+.0521327014,2.4)}function an(e){return e<.0031308?12.92*e:1.055*Math.pow(e,.41666)-.055}let An;class ln{static getDataURL(e){if(/^data:/i.test(e.src))return e.src;if("undefined"==typeof HTMLCanvasElement)return e.src;let t;if(e instanceof HTMLCanvasElement)t=e;else{void 0===An&&(An=Xi("canvas")),An.width=e.width,An.height=e.height;const i=An.getContext("2d");e instanceof ImageData?i.putImageData(e,0,0):i.drawImage(e,0,0,e.width,e.height),t=An}return t.width>2048||t.height>2048?(console.warn("THREE.ImageUtils.getDataURL: Image converted to jpg for performance reasons",e),t.toDataURL("image/jpeg",.6)):t.toDataURL("image/png")}static sRGBToLinear(e){if("undefined"!=typeof HTMLImageElement&&e instanceof HTMLImageElement||"undefined"!=typeof HTMLCanvasElement&&e instanceof HTMLCanvasElement||"undefined"!=typeof ImageBitmap&&e instanceof ImageBitmap){const t=Xi("canvas");t.width=e.width,t.height=e.height;const i=t.getContext("2d");i.drawImage(e,0,0,e.width,e.height);const n=i.getImageData(0,0,e.width,e.height),o=n.data;for(let e=0;e<o.length;e++)o[e]=255*sn(o[e]/255);return i.putImageData(n,0,0),t}if(e.data){const t=e.data.slice(0);for(let e=0;e<t.length;e++)t instanceof Uint8Array||t instanceof Uint8ClampedArray?t[e]=Math.floor(255*sn(t[e]/255)):t[e]=sn(t[e]);return{data:t,width:e.width,height:e.height}}return console.warn("THREE.ImageUtils.sRGBToLinear(): Unsupported image type. No color space conversion applied."),e}}let cn=0;class hn{constructor(e=null){this.isSource=!0,Object.defineProperty(this,"id",{value:cn++}),this.uuid=Hi(),this.data=e,this.dataReady=!0,this.version=0}set needsUpdate(e){!0===e&&this.version++}toJSON(e){const t=void 0===e||"string"==typeof e;if(!t&&void 0!==e.images[this.uuid])return e.images[this.uuid];const i={uuid:this.uuid,url:""},n=this.data;if(null!==n){let e;if(Array.isArray(n)){e=[];for(let t=0,i=n.length;t<i;t++)n[t].isDataTexture?e.push(un(n[t].image)):e.push(un(n[t]))}else e=un(n);i.url=e}return t||(e.images[this.uuid]=i),i}}function un(e){return"undefined"!=typeof HTMLImageElement&&e instanceof HTMLImageElement||"undefined"!=typeof HTMLCanvasElement&&e instanceof HTMLCanvasElement||"undefined"!=typeof ImageBitmap&&e instanceof ImageBitmap?ln.getDataURL(e):e.data?{data:Array.from(e.data),width:e.width,height:e.height,type:e.data.constructor.name}:(console.warn("THREE.Texture: Unable to serialize Texture."),{})}let dn=0,pn=class e extends ki{constructor(t=e.DEFAULT_IMAGE,i=e.DEFAULT_MAPPING,n=1001,o=1001,r=1006,s=1008,a=1023,A=1009,l=e.DEFAULT_ANISOTROPY,c=""){super(),this.isTexture=!0,Object.defineProperty(this,"id",{value:dn++}),this.uuid=Hi(),this.name="",this.source=new hn(t),this.mipmaps=[],this.mapping=i,this.channel=0,this.wrapS=n,this.wrapT=o,this.magFilter=r,this.minFilter=s,this.anisotropy=l,this.format=a,this.internalFormat=null,this.type=A,this.offset=new $i(0,0),this.repeat=new $i(1,1),this.center=new $i(0,0),this.rotation=0,this.matrixAutoUpdate=!0,this.matrix=new Ki,this.generateMipmaps=!0,this.premultiplyAlpha=!1,this.flipY=!0,this.unpackAlignment=4,this.colorSpace=c,this.userData={},this.version=0,this.onUpdate=null,this.isRenderTargetTexture=!1,this.pmremVersion=0}get image(){return this.source.data}set image(e=null){this.source.data=e}updateMatrix(){this.matrix.setUvTransform(this.offset.x,this.offset.y,this.repeat.x,this.repeat.y,this.rotation,this.center.x,this.center.y)}clone(){return(new this.constructor).copy(this)}copy(e){return this.name=e.name,this.source=e.source,this.mipmaps=e.mipmaps.slice(0),this.mapping=e.mapping,this.channel=e.channel,this.wrapS=e.wrapS,this.wrapT=e.wrapT,this.magFilter=e.magFilter,this.minFilter=e.minFilter,this.anisotropy=e.anisotropy,this.format=e.format,this.internalFormat=e.internalFormat,this.type=e.type,this.offset.copy(e.offset),this.repeat.copy(e.repeat),this.center.copy(e.center),this.rotation=e.rotation,this.matrixAutoUpdate=e.matrixAutoUpdate,this.matrix.copy(e.matrix),this.generateMipmaps=e.generateMipmaps,this.premultiplyAlpha=e.premultiplyAlpha,this.flipY=e.flipY,this.unpackAlignment=e.unpackAlignment,this.colorSpace=e.colorSpace,this.userData=JSON.parse(JSON.stringify(e.userData)),this.needsUpdate=!0,this}toJSON(e){const t=void 0===e||"string"==typeof e;if(!t&&void 0!==e.textures[this.uuid])return e.textures[this.uuid];const i={metadata:{version:4.6,type:"Texture",generator:"Texture.toJSON"},uuid:this.uuid,name:this.name,image:this.source.toJSON(e).uuid,mapping:this.mapping,channel:this.channel,repeat:[this.repeat.x,this.repeat.y],offset:[this.offset.x,this.offset.y],center:[this.center.x,this.center.y],rotation:this.rotation,wrap:[this.wrapS,this.wrapT],format:this.format,internalFormat:this.internalFormat,type:this.type,colorSpace:this.colorSpace,minFilter:this.minFilter,magFilter:this.magFilter,anisotropy:this.anisotropy,flipY:this.flipY,generateMipmaps:this.generateMipmaps,premultiplyAlpha:this.premultiplyAlpha,unpackAlignment:this.unpackAlignment};return Object.keys(this.userData).length>0&&(i.userData=this.userData),t||(e.textures[this.uuid]=i),i}dispose(){this.dispatchEvent({type:"dispose"})}transformUv(e){if(this.mapping!==je)return e;if(e.applyMatrix3(this.matrix),e.x<0||e.x>1)switch(this.wrapS){case et:e.x=e.x-Math.floor(e.x);break;case tt:e.x=e.x<0?0:1;break;case it:1===Math.abs(Math.floor(e.x)%2)?e.x=Math.ceil(e.x)-e.x:e.x=e.x-Math.floor(e.x)}if(e.y<0||e.y>1)switch(this.wrapT){case et:e.y=e.y-Math.floor(e.y);break;case tt:e.y=e.y<0?0:1;break;case it:1===Math.abs(Math.floor(e.y)%2)?e.y=Math.ceil(e.y)-e.y:e.y=e.y-Math.floor(e.y)}return this.flipY&&(e.y=1-e.y),e}set needsUpdate(e){!0===e&&(this.version++,this.source.needsUpdate=!0)}set needsPMREMUpdate(e){!0===e&&this.pmremVersion++}};pn.DEFAULT_IMAGE=null,pn.DEFAULT_MAPPING=je,pn.DEFAULT_ANISOTROPY=1;class _n{constructor(e=0,t=0,i=0,n=1){_n.prototype.isVector4=!0,this.x=e,this.y=t,this.z=i,this.w=n}get width(){return this.z}set width(e){this.z=e}get height(){return this.w}set height(e){this.w=e}set(e,t,i,n){return this.x=e,this.y=t,this.z=i,this.w=n,this}setScalar(e){return this.x=e,this.y=e,this.z=e,this.w=e,this}setX(e){return this.x=e,this}setY(e){return this.y=e,this}setZ(e){return this.z=e,this}setW(e){return this.w=e,this}setComponent(e,t){switch(e){case 0:this.x=t;break;case 1:this.y=t;break;case 2:this.z=t;break;case 3:this.w=t;break;default:throw new Error("index is out of range: "+e)}return this}getComponent(e){switch(e){case 0:return this.x;case 1:return this.y;case 2:return this.z;case 3:return this.w;default:throw new Error("index is out of range: "+e)}}clone(){return new this.constructor(this.x,this.y,this.z,this.w)}copy(e){return this.x=e.x,this.y=e.y,this.z=e.z,this.w=void 0!==e.w?e.w:1,this}add(e){return this.x+=e.x,this.y+=e.y,this.z+=e.z,this.w+=e.w,this}addScalar(e){return this.x+=e,this.y+=e,this.z+=e,this.w+=e,this}addVectors(e,t){return this.x=e.x+t.x,this.y=e.y+t.y,this.z=e.z+t.z,this.w=e.w+t.w,this}addScaledVector(e,t){return this.x+=e.x*t,this.y+=e.y*t,this.z+=e.z*t,this.w+=e.w*t,this}sub(e){return this.x-=e.x,this.y-=e.y,this.z-=e.z,this.w-=e.w,this}subScalar(e){return this.x-=e,this.y-=e,this.z-=e,this.w-=e,this}subVectors(e,t){return this.x=e.x-t.x,this.y=e.y-t.y,this.z=e.z-t.z,this.w=e.w-t.w,this}multiply(e){return this.x*=e.x,this.y*=e.y,this.z*=e.z,this.w*=e.w,this}multiplyScalar(e){return this.x*=e,this.y*=e,this.z*=e,this.w*=e,this}applyMatrix4(e){const t=this.x,i=this.y,n=this.z,o=this.w,r=e.elements;return this.x=r[0]*t+r[4]*i+r[8]*n+r[12]*o,this.y=r[1]*t+r[5]*i+r[9]*n+r[13]*o,this.z=r[2]*t+r[6]*i+r[10]*n+r[14]*o,this.w=r[3]*t+r[7]*i+r[11]*n+r[15]*o,this}divideScalar(e){return this.multiplyScalar(1/e)}setAxisAngleFromQuaternion(e){this.w=2*Math.acos(e.w);const t=Math.sqrt(1-e.w*e.w);return t<1e-4?(this.x=1,this.y=0,this.z=0):(this.x=e.x/t,this.y=e.y/t,this.z=e.z/t),this}setAxisAngleFromRotationMatrix(e){let t,i,n,o;const r=.01,s=.1,a=e.elements,A=a[0],l=a[4],c=a[8],h=a[1],u=a[5],d=a[9],p=a[2],_=a[6],g=a[10];if(Math.abs(l-h)<r&&Math.abs(c-p)<r&&Math.abs(d-_)<r){if(Math.abs(l+h)<s&&Math.abs(c+p)<s&&Math.abs(d+_)<s&&Math.abs(A+u+g-3)<s)return this.set(1,0,0,0),this;t=Math.PI;const e=(A+1)/2,a=(u+1)/2,m=(g+1)/2,f=(l+h)/4,v=(c+p)/4,w=(d+_)/4;return e>a&&e>m?e<r?(i=0,n=.707106781,o=.707106781):(i=Math.sqrt(e),n=f/i,o=v/i):a>m?a<r?(i=.707106781,n=0,o=.707106781):(n=Math.sqrt(a),i=f/n,o=w/n):m<r?(i=.707106781,n=.707106781,o=0):(o=Math.sqrt(m),i=v/o,n=w/o),this.set(i,n,o,t),this}let m=Math.sqrt((_-d)*(_-d)+(c-p)*(c-p)+(h-l)*(h-l));return Math.abs(m)<.001&&(m=1),this.x=(_-d)/m,this.y=(c-p)/m,this.z=(h-l)/m,this.w=Math.acos((A+u+g-1)/2),this}setFromMatrixPosition(e){const t=e.elements;return this.x=t[12],this.y=t[13],this.z=t[14],this.w=t[15],this}min(e){return this.x=Math.min(this.x,e.x),this.y=Math.min(this.y,e.y),this.z=Math.min(this.z,e.z),this.w=Math.min(this.w,e.w),this}max(e){return this.x=Math.max(this.x,e.x),this.y=Math.max(this.y,e.y),this.z=Math.max(this.z,e.z),this.w=Math.max(this.w,e.w),this}clamp(e,t){return this.x=Math.max(e.x,Math.min(t.x,this.x)),this.y=Math.max(e.y,Math.min(t.y,this.y)),this.z=Math.max(e.z,Math.min(t.z,this.z)),this.w=Math.max(e.w,Math.min(t.w,this.w)),this}clampScalar(e,t){return this.x=Math.max(e,Math.min(t,this.x)),this.y=Math.max(e,Math.min(t,this.y)),this.z=Math.max(e,Math.min(t,this.z)),this.w=Math.max(e,Math.min(t,this.w)),this}clampLength(e,t){const i=this.length();return this.divideScalar(i||1).multiplyScalar(Math.max(e,Math.min(t,i)))}floor(){return this.x=Math.floor(this.x),this.y=Math.floor(this.y),this.z=Math.floor(this.z),this.w=Math.floor(this.w),this}ceil(){return this.x=Math.ceil(this.x),this.y=Math.ceil(this.y),this.z=Math.ceil(this.z),this.w=Math.ceil(this.w),this}round(){return this.x=Math.round(this.x),this.y=Math.round(this.y),this.z=Math.round(this.z),this.w=Math.round(this.w),this}roundToZero(){return this.x=Math.trunc(this.x),this.y=Math.trunc(this.y),this.z=Math.trunc(this.z),this.w=Math.trunc(this.w),this}negate(){return this.x=-this.x,this.y=-this.y,this.z=-this.z,this.w=-this.w,this}dot(e){return this.x*e.x+this.y*e.y+this.z*e.z+this.w*e.w}lengthSq(){return this.x*this.x+this.y*this.y+this.z*this.z+this.w*this.w}length(){return Math.sqrt(this.x*this.x+this.y*this.y+this.z*this.z+this.w*this.w)}manhattanLength(){return Math.abs(this.x)+Math.abs(this.y)+Math.abs(this.z)+Math.abs(this.w)}normalize(){return this.divideScalar(this.length()||1)}setLength(e){return this.normalize().multiplyScalar(e)}lerp(e,t){return this.x+=(e.x-this.x)*t,this.y+=(e.y-this.y)*t,this.z+=(e.z-this.z)*t,this.w+=(e.w-this.w)*t,this}lerpVectors(e,t,i){return this.x=e.x+(t.x-e.x)*i,this.y=e.y+(t.y-e.y)*i,this.z=e.z+(t.z-e.z)*i,this.w=e.w+(t.w-e.w)*i,this}equals(e){return e.x===this.x&&e.y===this.y&&e.z===this.z&&e.w===this.w}fromArray(e,t=0){return this.x=e[t],this.y=e[t+1],this.z=e[t+2],this.w=e[t+3],this}toArray(e=[],t=0){return e[t]=this.x,e[t+1]=this.y,e[t+2]=this.z,e[t+3]=this.w,e}fromBufferAttribute(e,t){return this.x=e.getX(t),this.y=e.getY(t),this.z=e.getZ(t),this.w=e.getW(t),this}random(){return this.x=Math.random(),this.y=Math.random(),this.z=Math.random(),this.w=Math.random(),this}*[Symbol.iterator](){yield this.x,yield this.y,yield this.z,yield this.w}}class gn extends ki{constructor(e=1,t=1,i={}){super(),this.isRenderTarget=!0,this.width=e,this.height=t,this.depth=1,this.scissor=new _n(0,0,e,t),this.scissorTest=!1,this.viewport=new _n(0,0,e,t);const n={width:e,height:t,depth:1};i=Object.assign({generateMipmaps:!1,internalFormat:null,minFilter:st,depthBuffer:!0,stencilBuffer:!1,resolveDepthBuffer:!0,resolveStencilBuffer:!0,depthTexture:null,samples:0,count:1},i);const o=new pn(n,i.mapping,i.wrapS,i.wrapT,i.magFilter,i.minFilter,i.format,i.type,i.anisotropy,i.colorSpace);o.flipY=!1,o.generateMipmaps=i.generateMipmaps,o.internalFormat=i.internalFormat,this.textures=[];const r=i.count;for(let s=0;s<r;s++)this.textures[s]=o.clone(),this.textures[s].isRenderTargetTexture=!0;this.depthBuffer=i.depthBuffer,this.stencilBuffer=i.stencilBuffer,this.resolveDepthBuffer=i.resolveDepthBuffer,this.resolveStencilBuffer=i.resolveStencilBuffer,this.depthTexture=i.depthTexture,this.samples=i.samples}get texture(){return this.textures[0]}set texture(e){this.textures[0]=e}setSize(e,t,i=1){if(this.width!==e||this.height!==t||this.depth!==i){this.width=e,this.height=t,this.depth=i;for(let n=0,o=this.textures.length;n<o;n++)this.textures[n].image.width=e,this.textures[n].image.height=t,this.textures[n].image.depth=i;this.dispose()}this.viewport.set(0,0,e,t),this.scissor.set(0,0,e,t)}clone(){return(new this.constructor).copy(this)}copy(e){this.width=e.width,this.height=e.height,this.depth=e.depth,this.scissor.copy(e.scissor),this.scissorTest=e.scissorTest,this.viewport.copy(e.viewport),this.textures.length=0;for(let i=0,n=e.textures.length;i<n;i++)this.textures[i]=e.textures[i].clone(),this.textures[i].isRenderTargetTexture=!0;const t=Object.assign({},e.texture.image);return this.texture.source=new hn(t),this.depthBuffer=e.depthBuffer,this.stencilBuffer=e.stencilBuffer,this.resolveDepthBuffer=e.resolveDepthBuffer,this.resolveStencilBuffer=e.resolveStencilBuffer,null!==e.depthTexture&&(this.depthTexture=e.depthTexture.clone()),this.samples=e.samples,this}dispose(){this.dispatchEvent({type:"dispose"})}}class mn extends gn{constructor(e=1,t=1,i={}){super(e,t,i),this.isWebGLRenderTarget=!0}}class fn extends pn{constructor(e=null,t=1,i=1,n=1){super(null),this.isDataArrayTexture=!0,this.image={data:e,width:t,height:i,depth:n},this.magFilter=nt,this.minFilter=nt,this.wrapR=tt,this.generateMipmaps=!1,this.flipY=!1,this.unpackAlignment=1,this.layerUpdates=new Set}addLayerUpdate(e){this.layerUpdates.add(e)}clearLayerUpdates(){this.layerUpdates.clear()}}class vn extends pn{constructor(e=null,t=1,i=1,n=1){super(null),this.isData3DTexture=!0,this.image={data:e,width:t,height:i,depth:n},this.magFilter=nt,this.minFilter=nt,this.wrapR=tt,this.generateMipmaps=!1,this.flipY=!1,this.unpackAlignment=1}}class wn{constructor(e=0,t=0,i=0,n=1){this.isQuaternion=!0,this._x=e,this._y=t,this._z=i,this._w=n}static slerpFlat(e,t,i,n,o,r,s){let a=i[n+0],A=i[n+1],l=i[n+2],c=i[n+3];const h=o[r+0],u=o[r+1],d=o[r+2],p=o[r+3];if(0===s)return e[t+0]=a,e[t+1]=A,e[t+2]=l,void(e[t+3]=c);if(1===s)return e[t+0]=h,e[t+1]=u,e[t+2]=d,void(e[t+3]=p);if(c!==p||a!==h||A!==u||l!==d){let e=1-s;const t=a*h+A*u+l*d+c*p,i=t>=0?1:-1,n=1-t*t;if(n>Number.EPSILON){const o=Math.sqrt(n),r=Math.atan2(o,t*i);e=Math.sin(e*r)/o,s=Math.sin(s*r)/o}const o=s*i;if(a=a*e+h*o,A=A*e+u*o,l=l*e+d*o,c=c*e+p*o,e===1-s){const e=1/Math.sqrt(a*a+A*A+l*l+c*c);a*=e,A*=e,l*=e,c*=e}}e[t]=a,e[t+1]=A,e[t+2]=l,e[t+3]=c}static multiplyQuaternionsFlat(e,t,i,n,o,r){const s=i[n],a=i[n+1],A=i[n+2],l=i[n+3],c=o[r],h=o[r+1],u=o[r+2],d=o[r+3];return e[t]=s*d+l*c+a*u-A*h,e[t+1]=a*d+l*h+A*c-s*u,e[t+2]=A*d+l*u+s*h-a*c,e[t+3]=l*d-s*c-a*h-A*u,e}get x(){return this._x}set x(e){this._x=e,this._onChangeCallback()}get y(){return this._y}set y(e){this._y=e,this._onChangeCallback()}get z(){return this._z}set z(e){this._z=e,this._onChangeCallback()}get w(){return this._w}set w(e){this._w=e,this._onChangeCallback()}set(e,t,i,n){return this._x=e,this._y=t,this._z=i,this._w=n,this._onChangeCallback(),this}clone(){return new this.constructor(this._x,this._y,this._z,this._w)}copy(e){return this._x=e.x,this._y=e.y,this._z=e.z,this._w=e.w,this._onChangeCallback(),this}setFromEuler(e,t=!0){const i=e._x,n=e._y,o=e._z,r=e._order,s=Math.cos,a=Math.sin,A=s(i/2),l=s(n/2),c=s(o/2),h=a(i/2),u=a(n/2),d=a(o/2);switch(r){case"XYZ":this._x=h*l*c+A*u*d,this._y=A*u*c-h*l*d,this._z=A*l*d+h*u*c,this._w=A*l*c-h*u*d;break;case"YXZ":this._x=h*l*c+A*u*d,this._y=A*u*c-h*l*d,this._z=A*l*d-h*u*c,this._w=A*l*c+h*u*d;break;case"ZXY":this._x=h*l*c-A*u*d,this._y=A*u*c+h*l*d,this._z=A*l*d+h*u*c,this._w=A*l*c-h*u*d;break;case"ZYX":this._x=h*l*c-A*u*d,this._y=A*u*c+h*l*d,this._z=A*l*d-h*u*c,this._w=A*l*c+h*u*d;break;case"YZX":this._x=h*l*c+A*u*d,this._y=A*u*c+h*l*d,this._z=A*l*d-h*u*c,this._w=A*l*c-h*u*d;break;case"XZY":this._x=h*l*c-A*u*d,this._y=A*u*c-h*l*d,this._z=A*l*d+h*u*c,this._w=A*l*c+h*u*d;break;default:console.warn("THREE.Quaternion: .setFromEuler() encountered an unknown order: "+r)}return!0===t&&this._onChangeCallback(),this}setFromAxisAngle(e,t){const i=t/2,n=Math.sin(i);return this._x=e.x*n,this._y=e.y*n,this._z=e.z*n,this._w=Math.cos(i),this._onChangeCallback(),this}setFromRotationMatrix(e){const t=e.elements,i=t[0],n=t[4],o=t[8],r=t[1],s=t[5],a=t[9],A=t[2],l=t[6],c=t[10],h=i+s+c;if(h>0){const e=.5/Math.sqrt(h+1);this._w=.25/e,this._x=(l-a)*e,this._y=(o-A)*e,this._z=(r-n)*e}else if(i>s&&i>c){const e=2*Math.sqrt(1+i-s-c);this._w=(l-a)/e,this._x=.25*e,this._y=(n+r)/e,this._z=(o+A)/e}else if(s>c){const e=2*Math.sqrt(1+s-i-c);this._w=(o-A)/e,this._x=(n+r)/e,this._y=.25*e,this._z=(a+l)/e}else{const e=2*Math.sqrt(1+c-i-s);this._w=(r-n)/e,this._x=(o+A)/e,this._y=(a+l)/e,this._z=.25*e}return this._onChangeCallback(),this}setFromUnitVectors(e,t){let i=e.dot(t)+1;return i<Number.EPSILON?(i=0,Math.abs(e.x)>Math.abs(e.z)?(this._x=-e.y,this._y=e.x,this._z=0,this._w=i):(this._x=0,this._y=-e.z,this._z=e.y,this._w=i)):(this._x=e.y*t.z-e.z*t.y,this._y=e.z*t.x-e.x*t.z,this._z=e.x*t.y-e.y*t.x,this._w=i),this.normalize()}angleTo(e){return 2*Math.acos(Math.abs(Ni(this.dot(e),-1,1)))}rotateTowards(e,t){const i=this.angleTo(e);if(0===i)return this;const n=Math.min(1,t/i);return this.slerp(e,n),this}identity(){return this.set(0,0,0,1)}invert(){return this.conjugate()}conjugate(){return this._x*=-1,this._y*=-1,this._z*=-1,this._onChangeCallback(),this}dot(e){return this._x*e._x+this._y*e._y+this._z*e._z+this._w*e._w}lengthSq(){return this._x*this._x+this._y*this._y+this._z*this._z+this._w*this._w}length(){return Math.sqrt(this._x*this._x+this._y*this._y+this._z*this._z+this._w*this._w)}normalize(){let e=this.length();return 0===e?(this._x=0,this._y=0,this._z=0,this._w=1):(e=1/e,this._x=this._x*e,this._y=this._y*e,this._z=this._z*e,this._w=this._w*e),this._onChangeCallback(),this}multiply(e){return this.multiplyQuaternions(this,e)}premultiply(e){return this.multiplyQuaternions(e,this)}multiplyQuaternions(e,t){const i=e._x,n=e._y,o=e._z,r=e._w,s=t._x,a=t._y,A=t._z,l=t._w;return this._x=i*l+r*s+n*A-o*a,this._y=n*l+r*a+o*s-i*A,this._z=o*l+r*A+i*a-n*s,this._w=r*l-i*s-n*a-o*A,this._onChangeCallback(),this}slerp(e,t){if(0===t)return this;if(1===t)return this.copy(e);const i=this._x,n=this._y,o=this._z,r=this._w;let s=r*e._w+i*e._x+n*e._y+o*