Add 3D Brain model

css/style.css

@@ -83,3 +83,7 @@ svg {
 .highlight {
   background-color: rgb(251, 255, 130);
 }
+
+#brain-container canvas {
+  margin: 1rem auto;
+}

index.html

@@ -125,6 +125,8 @@
 <div class='row'>
   <div class='column'>
     <p>Cerebellum is one of the major controlling areas in terms of motor function: that means moving our bodies and keeping our balance ...</p>
+
+    <div id='brain-container'></div>
   </div class='column'>
 </div>
 
@@ -199,5 +201,11 @@
 <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.5.1/chart.min.js" integrity="sha512-Wt1bJGtlnMtGP0dqNFH1xlkLBNpEodaiQ8ZN5JLA5wpc1sUlk/O5uuOMNgvzddzkpvZ9GLyYNa8w2s7rqiTk5Q==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
 <script src="javascript/alcohol-use-disorder.js"></script>
 <script src='javascript/main.js'></script>
+<script src="javascript/three.js"></script>
+<script src="javascript/OBJLoader.js"></script>
+<script src="javascript/GLTFLoader.js"></script>
+<script src="javascript/MTLLoader.js"></script>
+<script src="javascript/OrbitControls.js"></script>
+<script src="javascript/brain.js"></script>
 
 </html>

javascript/MTLLoader.js

@@ -0,0 +1,494 @@
+( function () {
+
+	/**
+ * Loads a Wavefront .mtl file specifying materials
+ */
+
+	class MTLLoader extends THREE.Loader {
+
+		constructor( manager ) {
+
+			super( manager );
+
+		}
+		/**
+   * Loads and parses a MTL asset from a URL.
+   *
+   * @param {String} url - URL to the MTL file.
+   * @param {Function} [onLoad] - Callback invoked with the loaded object.
+   * @param {Function} [onProgress] - Callback for download progress.
+   * @param {Function} [onError] - Callback for download errors.
+   *
+   * @see setPath setResourcePath
+   *
+   * @note In order for relative texture references to resolve correctly
+   * you must call setResourcePath() explicitly prior to load.
+   */
+
+
+		load( url, onLoad, onProgress, onError ) {
+
+			const scope = this;
+			const path = this.path === '' ? THREE.LoaderUtils.extractUrlBase( url ) : this.path;
+			const loader = new THREE.FileLoader( this.manager );
+			loader.setPath( this.path );
+			loader.setRequestHeader( this.requestHeader );
+			loader.setWithCredentials( this.withCredentials );
+			loader.load( url, function ( text ) {
+
+				try {
+
+					onLoad( scope.parse( text, path ) );
+
+				} catch ( e ) {
+
+					if ( onError ) {
+
+						onError( e );
+
+					} else {
+
+						console.error( e );
+
+					}
+
+					scope.manager.itemError( url );
+
+				}
+
+			}, onProgress, onError );
+
+		}
+
+		setMaterialOptions( value ) {
+
+			this.materialOptions = value;
+			return this;
+
+		}
+		/**
+   * Parses a MTL file.
+   *
+   * @param {String} text - Content of MTL file
+   * @return {MaterialCreator}
+   *
+   * @see setPath setResourcePath
+   *
+   * @note In order for relative texture references to resolve correctly
+   * you must call setResourcePath() explicitly prior to parse.
+   */
+
+
+		parse( text, path ) {
+
+			const lines = text.split( '\n' );
+			let info = {};
+			const delimiter_pattern = /\s+/;
+			const materialsInfo = {};
+
+			for ( let i = 0; i < lines.length; i ++ ) {
+
+				let line = lines[ i ];
+				line = line.trim();
+
+				if ( line.length === 0 || line.charAt( 0 ) === '#' ) {
+
+					// Blank line or comment ignore
+					continue;
+
+				}
+
+				const pos = line.indexOf( ' ' );
+				let key = pos >= 0 ? line.substring( 0, pos ) : line;
+				key = key.toLowerCase();
+				let value = pos >= 0 ? line.substring( pos + 1 ) : '';
+				value = value.trim();
+
+				if ( key === 'newmtl' ) {
+
+					// New material
+					info = {
+						name: value
+					};
+					materialsInfo[ value ] = info;
+
+				} else {
+
+					if ( key === 'ka' || key === 'kd' || key === 'ks' || key === 'ke' ) {
+
+						const ss = value.split( delimiter_pattern, 3 );
+						info[ key ] = [ parseFloat( ss[ 0 ] ), parseFloat( ss[ 1 ] ), parseFloat( ss[ 2 ] ) ];
+
+					} else {
+
+						info[ key ] = value;
+
+					}
+
+				}
+
+			}
+
+			const materialCreator = new MaterialCreator( this.resourcePath || path, this.materialOptions );
+			materialCreator.setCrossOrigin( this.crossOrigin );
+			materialCreator.setManager( this.manager );
+			materialCreator.setMaterials( materialsInfo );
+			return materialCreator;
+
+		}
+
+	}
+	/**
+ * Create a new MTLLoader.MaterialCreator
+ * @param baseUrl - Url relative to which textures are loaded
+ * @param options - Set of options on how to construct the materials
+ *                  side: Which side to apply the material
+ *                        THREE.FrontSide (default), THREE.BackSide, THREE.DoubleSide
+ *                  wrap: What type of wrapping to apply for textures
+ *                        THREE.RepeatWrapping (default), THREE.ClampToEdgeWrapping, THREE.MirroredRepeatWrapping
+ *                  normalizeRGB: RGBs need to be normalized to 0-1 from 0-255
+ *                                Default: false, assumed to be already normalized
+ *                  ignoreZeroRGBs: Ignore values of RGBs (Ka,Kd,Ks) that are all 0's
+ *                                  Default: false
+ * @constructor
+ */
+
+
+	class MaterialCreator {
+
+		constructor( baseUrl = '', options = {} ) {
+
+			this.baseUrl = baseUrl;
+			this.options = options;
+			this.materialsInfo = {};
+			this.materials = {};
+			this.materialsArray = [];
+			this.nameLookup = {};
+			this.crossOrigin = 'anonymous';
+			this.side = this.options.side !== undefined ? this.options.side : THREE.FrontSide;
+			this.wrap = this.options.wrap !== undefined ? this.options.wrap : THREE.RepeatWrapping;
+
+		}
+
+		setCrossOrigin( value ) {
+
+			this.crossOrigin = value;
+			return this;
+
+		}
+
+		setManager( value ) {
+
+			this.manager = value;
+
+		}
+
+		setMaterials( materialsInfo ) {
+
+			this.materialsInfo = this.convert( materialsInfo );
+			this.materials = {};
+			this.materialsArray = [];
+			this.nameLookup = {};
+
+		}
+
+		convert( materialsInfo ) {
+
+			if ( ! this.options ) return materialsInfo;
+			const converted = {};
+
+			for ( const mn in materialsInfo ) {
+
+				// Convert materials info into normalized form based on options
+				const mat = materialsInfo[ mn ];
+				const covmat = {};
+				converted[ mn ] = covmat;
+
+				for ( const prop in mat ) {
+
+					let save = true;
+					let value = mat[ prop ];
+					const lprop = prop.toLowerCase();
+
+					switch ( lprop ) {
+
+						case 'kd':
+						case 'ka':
+						case 'ks':
+							// Diffuse color (color under white light) using RGB values
+							if ( this.options && this.options.normalizeRGB ) {
+
+								value = [ value[ 0 ] / 255, value[ 1 ] / 255, value[ 2 ] / 255 ];
+
+							}
+
+							if ( this.options && this.options.ignoreZeroRGBs ) {
+
+								if ( value[ 0 ] === 0 && value[ 1 ] === 0 && value[ 2 ] === 0 ) {
+
+									// ignore
+									save = false;
+
+								}
+
+							}
+
+							break;
+
+						default:
+							break;
+
+					}
+
+					if ( save ) {
+
+						covmat[ lprop ] = value;
+
+					}
+
+				}
+
+			}
+
+			return converted;
+
+		}
+
+		preload() {
+
+			for ( const mn in this.materialsInfo ) {
+
+				this.create( mn );
+
+			}
+
+		}
+
+		getIndex( materialName ) {
+
+			return this.nameLookup[ materialName ];
+
+		}
+
+		getAsArray() {
+
+			let index = 0;
+
+			for ( const mn in this.materialsInfo ) {
+
+				this.materialsArray[ index ] = this.create( mn );
+				this.nameLookup[ mn ] = index;
+				index ++;
+
+			}
+
+			return this.materialsArray;
+
+		}
+
+		create( materialName ) {
+
+			if ( this.materials[ materialName ] === undefined ) {
+
+				this.createMaterial_( materialName );
+
+			}
+
+			return this.materials[ materialName ];
+
+		}
+
+		createMaterial_( materialName ) {
+
+			// Create material
+			const scope = this;
+			const mat = this.materialsInfo[ materialName ];
+			const params = {
+				name: materialName,
+				side: this.side
+			};
+
+			function resolveURL( baseUrl, url ) {
+
+				if ( typeof url !== 'string' || url === '' ) return ''; // Absolute URL
+
+				if ( /^https?:\/\//i.test( url ) ) return url;
+				return baseUrl + url;
+
+			}
+
+			function setMapForType( mapType, value ) {
+
+				if ( params[ mapType ] ) return; // Keep the first encountered texture
+
+				const texParams = scope.getTextureParams( value, params );
+				const map = scope.loadTexture( resolveURL( scope.baseUrl, texParams.url ) );
+				map.repeat.copy( texParams.scale );
+				map.offset.copy( texParams.offset );
+				map.wrapS = scope.wrap;
+				map.wrapT = scope.wrap;
+				params[ mapType ] = map;
+
+			}
+
+			for ( const prop in mat ) {
+
+				const value = mat[ prop ];
+				let n;
+				if ( value === '' ) continue;
+
+				switch ( prop.toLowerCase() ) {
+
+					// Ns is material specular exponent
+					case 'kd':
+						// Diffuse color (color under white light) using RGB values
+						params.color = new THREE.Color().fromArray( value );
+						break;
+
+					case 'ks':
+						// Specular color (color when light is reflected from shiny surface) using RGB values
+						params.specular = new THREE.Color().fromArray( value );
+						break;
+
+					case 'ke':
+						// Emissive using RGB values
+						params.emissive = new THREE.Color().fromArray( value );
+						break;
+
+					case 'map_kd':
+						// Diffuse texture map
+						setMapForType( 'map', value );
+						break;
+
+					case 'map_ks':
+						// Specular map
+						setMapForType( 'specularMap', value );
+						break;
+
+					case 'map_ke':
+						// Emissive map
+						setMapForType( 'emissiveMap', value );
+						break;
+
+					case 'norm':
+						setMapForType( 'normalMap', value );
+						break;
+
+					case 'map_bump':
+					case 'bump':
+						// Bump texture map
+						setMapForType( 'bumpMap', value );
+						break;
+
+					case 'map_d':
+						// Alpha map
+						setMapForType( 'alphaMap', value );
+						params.transparent = true;
+						break;
+
+					case 'ns':
+						// The specular exponent (defines the focus of the specular highlight)
+						// A high exponent results in a tight, concentrated highlight. Ns values normally range from 0 to 1000.
+						params.shininess = parseFloat( value );
+						break;
+
+					case 'd':
+						n = parseFloat( value );
+
+						if ( n < 1 ) {
+
+							params.opacity = n;
+							params.transparent = true;
+
+						}
+
+						break;
+
+					case 'tr':
+						n = parseFloat( value );
+						if ( this.options && this.options.invertTrProperty ) n = 1 - n;
+
+						if ( n > 0 ) {
+
+							params.opacity = 1 - n;
+							params.transparent = true;
+
+						}
+
+						break;
+
+					default:
+						break;
+
+				}
+
+			}
+
+			this.materials[ materialName ] = new THREE.MeshPhongMaterial( params );
+			return this.materials[ materialName ];
+
+		}
+
+		getTextureParams( value, matParams ) {
+
+			const texParams = {
+				scale: new THREE.Vector2( 1, 1 ),
+				offset: new THREE.Vector2( 0, 0 )
+			};
+			const items = value.split( /\s+/ );
+			let pos;
+			pos = items.indexOf( '-bm' );
+
+			if ( pos >= 0 ) {
+
+				matParams.bumpScale = parseFloat( items[ pos + 1 ] );
+				items.splice( pos, 2 );
+
+			}
+
+			pos = items.indexOf( '-s' );
+
+			if ( pos >= 0 ) {
+
+				texParams.scale.set( parseFloat( items[ pos + 1 ] ), parseFloat( items[ pos + 2 ] ) );
+				items.splice( pos, 4 ); // we expect 3 parameters here!
+
+			}
+
+			pos = items.indexOf( '-o' );
+
+			if ( pos >= 0 ) {
+
+				texParams.offset.set( parseFloat( items[ pos + 1 ] ), parseFloat( items[ pos + 2 ] ) );
+				items.splice( pos, 4 ); // we expect 3 parameters here!
+
+			}
+
+			texParams.url = items.join( ' ' ).trim();
+			return texParams;
+
+		}
+
+		loadTexture( url, mapping, onLoad, onProgress, onError ) {
+
+			const manager = this.manager !== undefined ? this.manager : THREE.DefaultLoadingManager;
+			let loader = manager.getHandler( url );
+
+			if ( loader === null ) {
+
+				loader = new THREE.TextureLoader( manager );
+
+			}
+
+			if ( loader.setCrossOrigin ) loader.setCrossOrigin( this.crossOrigin );
+			const texture = loader.load( url, onLoad, onProgress, onError );
+			if ( mapping !== undefined ) texture.mapping = mapping;
+			return texture;
+
+		}
+
+	}
+
+	THREE.MTLLoader = MTLLoader;
+
+} )();

javascript/OBJLoader.js

@@ -0,0 +1,808 @@
+( function () {
+
+	const _object_pattern = /^[og]\s*(.+)?/; // mtllib file_reference
+
+	const _material_library_pattern = /^mtllib /; // usemtl material_name
+
+	const _material_use_pattern = /^usemtl /; // usemap map_name
+
+	const _map_use_pattern = /^usemap /;
+
+	const _vA = new THREE.Vector3();
+
+	const _vB = new THREE.Vector3();
+
+	const _vC = new THREE.Vector3();
+
+	const _ab = new THREE.Vector3();
+
+	const _cb = new THREE.Vector3();
+
+	function ParserState() {
+
+		const state = {
+			objects: [],
+			object: {},
+			vertices: [],
+			normals: [],
+			colors: [],
+			uvs: [],
+			materials: {},
+			materialLibraries: [],
+			startObject: function ( name, fromDeclaration ) {
+
+				// If the current object (initial from reset) is not from a g/o declaration in the parsed
+				// file. We need to use it for the first parsed g/o to keep things in sync.
+				if ( this.object && this.object.fromDeclaration === false ) {
+
+					this.object.name = name;
+					this.object.fromDeclaration = fromDeclaration !== false;
+					return;
+
+				}
+
+				const previousMaterial = this.object && typeof this.object.currentMaterial === 'function' ? this.object.currentMaterial() : undefined;
+
+				if ( this.object && typeof this.object._finalize === 'function' ) {
+
+					this.object._finalize( true );
+
+				}
+
+				this.object = {
+					name: name || '',
+					fromDeclaration: fromDeclaration !== false,
+					geometry: {
+						vertices: [],
+						normals: [],
+						colors: [],
+						uvs: [],
+						hasUVIndices: false
+					},
+					materials: [],
+					smooth: true,
+					startMaterial: function ( name, libraries ) {
+
+						const previous = this._finalize( false ); // New usemtl declaration overwrites an inherited material, except if faces were declared
+						// after the material, then it must be preserved for proper MultiMaterial continuation.
+
+
+						if ( previous && ( previous.inherited || previous.groupCount <= 0 ) ) {
+
+							this.materials.splice( previous.index, 1 );
+
+						}
+
+						const material = {
+							index: this.materials.length,
+							name: name || '',
+							mtllib: Array.isArray( libraries ) && libraries.length > 0 ? libraries[ libraries.length - 1 ] : '',
+							smooth: previous !== undefined ? previous.smooth : this.smooth,
+							groupStart: previous !== undefined ? previous.groupEnd : 0,
+							groupEnd: - 1,
+							groupCount: - 1,
+							inherited: false,
+							clone: function ( index ) {
+
+								const cloned = {
+									index: typeof index === 'number' ? index : this.index,
+									name: this.name,
+									mtllib: this.mtllib,
+									smooth: this.smooth,
+									groupStart: 0,
+									groupEnd: - 1,
+									groupCount: - 1,
+									inherited: false
+								};
+								cloned.clone = this.clone.bind( cloned );
+								return cloned;
+
+							}
+						};
+						this.materials.push( material );
+						return material;
+
+					},
+					currentMaterial: function () {
+
+						if ( this.materials.length > 0 ) {
+
+							return this.materials[ this.materials.length - 1 ];
+
+						}
+
+						return undefined;
+
+					},
+					_finalize: function ( end ) {
+
+						const lastMultiMaterial = this.currentMaterial();
+
+						if ( lastMultiMaterial && lastMultiMaterial.groupEnd === - 1 ) {
+
+							lastMultiMaterial.groupEnd = this.geometry.vertices.length / 3;
+							lastMultiMaterial.groupCount = lastMultiMaterial.groupEnd - lastMultiMaterial.groupStart;
+							lastMultiMaterial.inherited = false;
+
+						} // Ignore objects tail materials if no face declarations followed them before a new o/g started.
+
+
+						if ( end && this.materials.length > 1 ) {
+
+							for ( let mi = this.materials.length - 1; mi >= 0; mi -- ) {
+
+								if ( this.materials[ mi ].groupCount <= 0 ) {
+
+									this.materials.splice( mi, 1 );
+
+								}
+
+							}
+
+						} // Guarantee at least one empty material, this makes the creation later more straight forward.
+
+
+						if ( end && this.materials.length === 0 ) {
+
+							this.materials.push( {
+								name: '',
+								smooth: this.smooth
+							} );
+
+						}
+
+						return lastMultiMaterial;
+
+					}
+				}; // Inherit previous objects material.
+				// Spec tells us that a declared material must be set to all objects until a new material is declared.
+				// If a usemtl declaration is encountered while this new object is being parsed, it will
+				// overwrite the inherited material. Exception being that there was already face declarations
+				// to the inherited material, then it will be preserved for proper MultiMaterial continuation.
+
+				if ( previousMaterial && previousMaterial.name && typeof previousMaterial.clone === 'function' ) {
+
+					const declared = previousMaterial.clone( 0 );
+					declared.inherited = true;
+					this.object.materials.push( declared );
+
+				}
+
+				this.objects.push( this.object );
+
+			},
+			finalize: function () {
+
+				if ( this.object && typeof this.object._finalize === 'function' ) {
+
+					this.object._finalize( true );
+
+				}
+
+			},
+			parseVertexIndex: function ( value, len ) {
+
+				const index = parseInt( value, 10 );
+				return ( index >= 0 ? index - 1 : index + len / 3 ) * 3;
+
+			},
+			parseNormalIndex: function ( value, len ) {
+
+				const index = parseInt( value, 10 );
+				return ( index >= 0 ? index - 1 : index + len / 3 ) * 3;
+
+			},
+			parseUVIndex: function ( value, len ) {
+
+				const index = parseInt( value, 10 );
+				return ( index >= 0 ? index - 1 : index + len / 2 ) * 2;
+
+			},
+			addVertex: function ( a, b, c ) {
+
+				const src = this.vertices;
+				const dst = this.object.geometry.vertices;
+				dst.push( src[ a + 0 ], src[ a + 1 ], src[ a + 2 ] );
+				dst.push( src[ b + 0 ], src[ b + 1 ], src[ b + 2 ] );
+				dst.push( src[ c + 0 ], src[ c + 1 ], src[ c + 2 ] );
+
+			},
+			addVertexPoint: function ( a ) {
+
+				const src = this.vertices;
+				const dst = this.object.geometry.vertices;
+				dst.push( src[ a + 0 ], src[ a + 1 ], src[ a + 2 ] );
+
+			},
+			addVertexLine: function ( a ) {
+
+				const src = this.vertices;
+				const dst = this.object.geometry.vertices;
+				dst.push( src[ a + 0 ], src[ a + 1 ], src[ a + 2 ] );
+
+			},
+			addNormal: function ( a, b, c ) {
+
+				const src = this.normals;
+				const dst = this.object.geometry.normals;
+				dst.push( src[ a + 0 ], src[ a + 1 ], src[ a + 2 ] );
+				dst.push( src[ b + 0 ], src[ b + 1 ], src[ b + 2 ] );
+				dst.push( src[ c + 0 ], src[ c + 1 ], src[ c + 2 ] );
+
+			},
+			addFaceNormal: function ( a, b, c ) {
+
+				const src = this.vertices;
+				const dst = this.object.geometry.normals;
+
+				_vA.fromArray( src, a );
+
+				_vB.fromArray( src, b );
+
+				_vC.fromArray( src, c );
+
+				_cb.subVectors( _vC, _vB );
+
+				_ab.subVectors( _vA, _vB );
+
+				_cb.cross( _ab );
+
+				_cb.normalize();
+
+				dst.push( _cb.x, _cb.y, _cb.z );
+				dst.push( _cb.x, _cb.y, _cb.z );
+				dst.push( _cb.x, _cb.y, _cb.z );
+
+			},
+			addColor: function ( a, b, c ) {
+
+				const src = this.colors;
+				const dst = this.object.geometry.colors;
+				if ( src[ a ] !== undefined ) dst.push( src[ a + 0 ], src[ a + 1 ], src[ a + 2 ] );
+				if ( src[ b ] !== undefined ) dst.push( src[ b + 0 ], src[ b + 1 ], src[ b + 2 ] );
+				if ( src[ c ] !== undefined ) dst.push( src[ c + 0 ], src[ c + 1 ], src[ c + 2 ] );
+
+			},
+			addUV: function ( a, b, c ) {
+
+				const src = this.uvs;
+				const dst = this.object.geometry.uvs;
+				dst.push( src[ a + 0 ], src[ a + 1 ] );
+				dst.push( src[ b + 0 ], src[ b + 1 ] );
+				dst.push( src[ c + 0 ], src[ c + 1 ] );
+
+			},
+			addDefaultUV: function () {
+
+				const dst = this.object.geometry.uvs;
+				dst.push( 0, 0 );
+				dst.push( 0, 0 );
+				dst.push( 0, 0 );
+
+			},
+			addUVLine: function ( a ) {
+
+				const src = this.uvs;
+				const dst = this.object.geometry.uvs;
+				dst.push( src[ a + 0 ], src[ a + 1 ] );
+
+			},
+			addFace: function ( a, b, c, ua, ub, uc, na, nb, nc ) {
+
+				const vLen = this.vertices.length;
+				let ia = this.parseVertexIndex( a, vLen );
+				let ib = this.parseVertexIndex( b, vLen );
+				let ic = this.parseVertexIndex( c, vLen );
+				this.addVertex( ia, ib, ic );
+				this.addColor( ia, ib, ic ); // normals
+
+				if ( na !== undefined && na !== '' ) {
+
+					const nLen = this.normals.length;
+					ia = this.parseNormalIndex( na, nLen );
+					ib = this.parseNormalIndex( nb, nLen );
+					ic = this.parseNormalIndex( nc, nLen );
+					this.addNormal( ia, ib, ic );
+
+				} else {
+
+					this.addFaceNormal( ia, ib, ic );
+
+				} // uvs
+
+
+				if ( ua !== undefined && ua !== '' ) {
+
+					const uvLen = this.uvs.length;
+					ia = this.parseUVIndex( ua, uvLen );
+					ib = this.parseUVIndex( ub, uvLen );
+					ic = this.parseUVIndex( uc, uvLen );
+					this.addUV( ia, ib, ic );
+					this.object.geometry.hasUVIndices = true;
+
+				} else {
+
+					// add placeholder values (for inconsistent face definitions)
+					this.addDefaultUV();
+
+				}
+
+			},
+			addPointGeometry: function ( vertices ) {
+
+				this.object.geometry.type = 'Points';
+				const vLen = this.vertices.length;
+
+				for ( let vi = 0, l = vertices.length; vi < l; vi ++ ) {
+
+					const index = this.parseVertexIndex( vertices[ vi ], vLen );
+					this.addVertexPoint( index );
+					this.addColor( index );
+
+				}
+
+			},
+			addLineGeometry: function ( vertices, uvs ) {
+
+				this.object.geometry.type = 'Line';
+				const vLen = this.vertices.length;
+				const uvLen = this.uvs.length;
+
+				for ( let vi = 0, l = vertices.length; vi < l; vi ++ ) {
+
+					this.addVertexLine( this.parseVertexIndex( vertices[ vi ], vLen ) );
+
+				}
+
+				for ( let uvi = 0, l = uvs.length; uvi < l; uvi ++ ) {
+
+					this.addUVLine( this.parseUVIndex( uvs[ uvi ], uvLen ) );
+
+				}
+
+			}
+		};
+		state.startObject( '', false );
+		return state;
+
+	} //
+
+
+	class OBJLoader extends THREE.Loader {
+
+		constructor( manager ) {
+
+			super( manager );
+			this.materials = null;
+
+		}
+
+		load( url, onLoad, onProgress, onError ) {
+
+			const scope = this;
+			const loader = new THREE.FileLoader( this.manager );
+			loader.setPath( this.path );
+			loader.setRequestHeader( this.requestHeader );
+			loader.setWithCredentials( this.withCredentials );
+			loader.load( url, function ( text ) {
+
+				try {
+
+					onLoad( scope.parse( text ) );
+
+				} catch ( e ) {
+
+					if ( onError ) {
+
+						onError( e );
+
+					} else {
+
+						console.error( e );
+
+					}
+
+					scope.manager.itemError( url );
+
+				}
+
+			}, onProgress, onError );
+
+		}
+
+		setMaterials( materials ) {
+
+			this.materials = materials;
+			return this;
+
+		}
+
+		parse( text ) {
+
+			const state = new ParserState();
+
+			if ( text.indexOf( '\r\n' ) !== - 1 ) {
+
+				// This is faster than String.split with regex that splits on both
+				text = text.replace( /\r\n/g, '\n' );
+
+			}
+
+			if ( text.indexOf( '\\\n' ) !== - 1 ) {
+
+				// join lines separated by a line continuation character (\)
+				text = text.replace( /\\\n/g, '' );
+
+			}
+
+			const lines = text.split( '\n' );
+			let line = '',
+				lineFirstChar = '';
+			let lineLength = 0;
+			let result = []; // Faster to just trim left side of the line. Use if available.
+
+			const trimLeft = typeof ''.trimLeft === 'function';
+
+			for ( let i = 0, l = lines.length; i < l; i ++ ) {
+
+				line = lines[ i ];
+				line = trimLeft ? line.trimLeft() : line.trim();
+				lineLength = line.length;
+				if ( lineLength === 0 ) continue;
+				lineFirstChar = line.charAt( 0 ); // @todo invoke passed in handler if any
+
+				if ( lineFirstChar === '#' ) continue;
+
+				if ( lineFirstChar === 'v' ) {
+
+					const data = line.split( /\s+/ );
+
+					switch ( data[ 0 ] ) {
+
+						case 'v':
+							state.vertices.push( parseFloat( data[ 1 ] ), parseFloat( data[ 2 ] ), parseFloat( data[ 3 ] ) );
+
+							if ( data.length >= 7 ) {
+
+								state.colors.push( parseFloat( data[ 4 ] ), parseFloat( data[ 5 ] ), parseFloat( data[ 6 ] ) );
+
+							} else {
+
+								// if no colors are defined, add placeholders so color and vertex indices match
+								state.colors.push( undefined, undefined, undefined );
+
+							}
+
+							break;
+
+						case 'vn':
+							state.normals.push( parseFloat( data[ 1 ] ), parseFloat( data[ 2 ] ), parseFloat( data[ 3 ] ) );
+							break;
+
+						case 'vt':
+							state.uvs.push( parseFloat( data[ 1 ] ), parseFloat( data[ 2 ] ) );
+							break;
+
+					}
+
+				} else if ( lineFirstChar === 'f' ) {
+
+					const lineData = line.substr( 1 ).trim();
+					const vertexData = lineData.split( /\s+/ );
+					const faceVertices = []; // Parse the face vertex data into an easy to work with format
+
+					for ( let j = 0, jl = vertexData.length; j < jl; j ++ ) {
+
+						const vertex = vertexData[ j ];
+
+						if ( vertex.length > 0 ) {
+
+							const vertexParts = vertex.split( '/' );
+							faceVertices.push( vertexParts );
+
+						}
+
+					} // Draw an edge between the first vertex and all subsequent vertices to form an n-gon
+
+
+					const v1 = faceVertices[ 0 ];
+
+					for ( let j = 1, jl = faceVertices.length - 1; j < jl; j ++ ) {
+
+						const v2 = faceVertices[ j ];
+						const v3 = faceVertices[ j + 1 ];
+						state.addFace( v1[ 0 ], v2[ 0 ], v3[ 0 ], v1[ 1 ], v2[ 1 ], v3[ 1 ], v1[ 2 ], v2[ 2 ], v3[ 2 ] );
+
+					}
+
+				} else if ( lineFirstChar === 'l' ) {
+
+					const lineParts = line.substring( 1 ).trim().split( ' ' );
+					let lineVertices = [];
+					const lineUVs = [];
+
+					if ( line.indexOf( '/' ) === - 1 ) {
+
+						lineVertices = lineParts;
+
+					} else {
+
+						for ( let li = 0, llen = lineParts.length; li < llen; li ++ ) {
+
+							const parts = lineParts[ li ].split( '/' );
+							if ( parts[ 0 ] !== '' ) lineVertices.push( parts[ 0 ] );
+							if ( parts[ 1 ] !== '' ) lineUVs.push( parts[ 1 ] );
+
+						}
+
+					}
+
+					state.addLineGeometry( lineVertices, lineUVs );
+
+				} else if ( lineFirstChar === 'p' ) {
+
+					const lineData = line.substr( 1 ).trim();
+					const pointData = lineData.split( ' ' );
+					state.addPointGeometry( pointData );
+
+				} else if ( ( result = _object_pattern.exec( line ) ) !== null ) {
+
+					// o object_name
+					// or
+					// g group_name
+					// WORKAROUND: https://bugs.chromium.org/p/v8/issues/detail?id=2869
+					// let name = result[ 0 ].substr( 1 ).trim();
+					const name = ( ' ' + result[ 0 ].substr( 1 ).trim() ).substr( 1 );
+					state.startObject( name );
+
+				} else if ( _material_use_pattern.test( line ) ) {
+
+					// material
+					state.object.startMaterial( line.substring( 7 ).trim(), state.materialLibraries );
+
+				} else if ( _material_library_pattern.test( line ) ) {
+
+					// mtl file
+					state.materialLibraries.push( line.substring( 7 ).trim() );
+
+				} else if ( _map_use_pattern.test( line ) ) {
+
+					// the line is parsed but ignored since the loader assumes textures are defined MTL files
+					// (according to https://www.okino.com/conv/imp_wave.htm, 'usemap' is the old-style Wavefront texture reference method)
+					console.warn( 'THREE.OBJLoader: Rendering identifier "usemap" not supported. Textures must be defined in MTL files.' );
+
+				} else if ( lineFirstChar === 's' ) {
+
+					result = line.split( ' ' ); // smooth shading
+					// @todo Handle files that have varying smooth values for a set of faces inside one geometry,
+					// but does not define a usemtl for each face set.
+					// This should be detected and a dummy material created (later MultiMaterial and geometry groups).
+					// This requires some care to not create extra material on each smooth value for "normal" obj files.
+					// where explicit usemtl defines geometry groups.
+					// Example asset: examples/models/obj/cerberus/Cerberus.obj
+
+					/*
+        	 * http://paulbourke.net/dataformats/obj/
+        	 * or
+        	 * http://www.cs.utah.edu/~boulos/cs3505/obj_spec.pdf
+        	 *
+        	 * From chapter "Grouping" Syntax explanation "s group_number":
+        	 * "group_number is the smoothing group number. To turn off smoothing groups, use a value of 0 or off.
+        	 * Polygonal elements use group numbers to put elements in different smoothing groups. For free-form
+        	 * surfaces, smoothing groups are either turned on or off; there is no difference between values greater
+        	 * than 0."
+        	 */
+
+					if ( result.length > 1 ) {
+
+						const value = result[ 1 ].trim().toLowerCase();
+						state.object.smooth = value !== '0' && value !== 'off';
+
+					} else {
+
+						// ZBrush can produce "s" lines #11707
+						state.object.smooth = true;
+
+					}
+
+					const material = state.object.currentMaterial();
+					if ( material ) material.smooth = state.object.smooth;
+
+				} else {
+
+					// Handle null terminated files without exception
+					if ( line === '\0' ) continue;
+					console.warn( 'THREE.OBJLoader: Unexpected line: "' + line + '"' );
+
+				}
+
+			}
+
+			state.finalize();
+			const container = new THREE.Group();
+			container.materialLibraries = [].concat( state.materialLibraries );
+			const hasPrimitives = ! ( state.objects.length === 1 && state.objects[ 0 ].geometry.vertices.length === 0 );
+
+			if ( hasPrimitives === true ) {
+
+				for ( let i = 0, l = state.objects.length; i < l; i ++ ) {
+
+					const object = state.objects[ i ];
+					const geometry = object.geometry;
+					const materials = object.materials;
+					const isLine = geometry.type === 'Line';
+					const isPoints = geometry.type === 'Points';
+					let hasVertexColors = false; // Skip o/g line declarations that did not follow with any faces
+
+					if ( geometry.vertices.length === 0 ) continue;
+					const buffergeometry = new THREE.BufferGeometry();
+					buffergeometry.setAttribute( 'position', new THREE.Float32BufferAttribute( geometry.vertices, 3 ) );
+
+					if ( geometry.normals.length > 0 ) {
+
+						buffergeometry.setAttribute( 'normal', new THREE.Float32BufferAttribute( geometry.normals, 3 ) );
+
+					}
+
+					if ( geometry.colors.length > 0 ) {
+
+						hasVertexColors = true;
+						buffergeometry.setAttribute( 'color', new THREE.Float32BufferAttribute( geometry.colors, 3 ) );
+
+					}
+
+					if ( geometry.hasUVIndices === true ) {
+
+						buffergeometry.setAttribute( 'uv', new THREE.Float32BufferAttribute( geometry.uvs, 2 ) );
+
+					} // Create materials
+
+
+					const createdMaterials = [];
+
+					for ( let mi = 0, miLen = materials.length; mi < miLen; mi ++ ) {
+
+						const sourceMaterial = materials[ mi ];
+						const materialHash = sourceMaterial.name + '_' + sourceMaterial.smooth + '_' + hasVertexColors;
+						let material = state.materials[ materialHash ];
+
+						if ( this.materials !== null ) {
+
+							material = this.materials.create( sourceMaterial.name ); // mtl etc. loaders probably can't create line materials correctly, copy properties to a line material.
+
+							if ( isLine && material && ! ( material instanceof THREE.LineBasicMaterial ) ) {
+
+								const materialLine = new THREE.LineBasicMaterial();
+								THREE.Material.prototype.copy.call( materialLine, material );
+								materialLine.color.copy( material.color );
+								material = materialLine;
+
+							} else if ( isPoints && material && ! ( material instanceof THREE.PointsMaterial ) ) {
+
+								const materialPoints = new THREE.PointsMaterial( {
+									size: 10,
+									sizeAttenuation: false
+								} );
+								THREE.Material.prototype.copy.call( materialPoints, material );
+								materialPoints.color.copy( material.color );
+								materialPoints.map = material.map;
+								material = materialPoints;
+
+							}
+
+						}
+
+						if ( material === undefined ) {
+
+							if ( isLine ) {
+
+								material = new THREE.LineBasicMaterial();
+
+							} else if ( isPoints ) {
+
+								material = new THREE.PointsMaterial( {
+									size: 1,
+									sizeAttenuation: false
+								} );
+
+							} else {
+
+								material = new THREE.MeshPhongMaterial();
+
+							}
+
+							material.name = sourceMaterial.name;
+							material.flatShading = sourceMaterial.smooth ? false : true;
+							material.vertexColors = hasVertexColors;
+							state.materials[ materialHash ] = material;
+
+						}
+
+						createdMaterials.push( material );
+
+					} // Create mesh
+
+
+					let mesh;
+
+					if ( createdMaterials.length > 1 ) {
+
+						for ( let mi = 0, miLen = materials.length; mi < miLen; mi ++ ) {
+
+							const sourceMaterial = materials[ mi ];
+							buffergeometry.addGroup( sourceMaterial.groupStart, sourceMaterial.groupCount, mi );
+
+						}
+
+						if ( isLine ) {
+
+							mesh = new THREE.LineSegments( buffergeometry, createdMaterials );
+
+						} else if ( isPoints ) {
+
+							mesh = new THREE.Points( buffergeometry, createdMaterials );
+
+						} else {
+
+							mesh = new THREE.Mesh( buffergeometry, createdMaterials );
+
+						}
+
+					} else {
+
+						if ( isLine ) {
+
+							mesh = new THREE.LineSegments( buffergeometry, createdMaterials[ 0 ] );
+
+						} else if ( isPoints ) {
+
+							mesh = new THREE.Points( buffergeometry, createdMaterials[ 0 ] );
+
+						} else {
+
+							mesh = new THREE.Mesh( buffergeometry, createdMaterials[ 0 ] );
+
+						}
+
+					}
+
+					mesh.name = object.name;
+					container.add( mesh );
+
+				}
+
+			} else {
+
+				// if there is only the default parser state object with no geometry data, interpret data as point cloud
+				if ( state.vertices.length > 0 ) {
+
+					const material = new THREE.PointsMaterial( {
+						size: 1,
+						sizeAttenuation: false
+					} );
+					const buffergeometry = new THREE.BufferGeometry();
+					buffergeometry.setAttribute( 'position', new THREE.Float32BufferAttribute( state.vertices, 3 ) );
+
+					if ( state.colors.length > 0 && state.colors[ 0 ] !== undefined ) {
+
+						buffergeometry.setAttribute( 'color', new THREE.Float32BufferAttribute( state.colors, 3 ) );
+						material.vertexColors = true;
+
+					}
+
+					const points = new THREE.Points( buffergeometry, material );
+					container.add( points );
+
+				}
+
+			}
+
+			return container;
+
+		}
+
+	}
+
+	THREE.OBJLoader = OBJLoader;
+
+} )();

javascript/brain.js

@@ -0,0 +1,60 @@
+const scene = new THREE.Scene();
+const width = 400;
+const height = 300;
+const camera = new THREE.PerspectiveCamera( 75, width / height, 0.01, 1000 );
+camera.position.set(-0.8, 0.11, -0.9);
+scene.background = new THREE.Color('white');
+
+const renderer = new THREE.WebGLRenderer();
+renderer.setSize(width, height);
+const canvas = document.getElementById('brain-container');
+canvas.appendChild( renderer.domElement );
+
+{
+  const controls = new THREE.OrbitControls(camera, canvas);
+  controls.target.set(0, 0.5, 0);
+  controls.update();
+}
+
+// Lights
+{ 
+    const color = 0xFFFFFF;
+    const intensity = 0.2;
+    const light = new THREE.AmbientLight(color, intensity);
+    //scene.add(light);
+}
+
+// Upper light
+{
+    const color = 0xFFFFFF;
+    const intensity = 0.6;
+    const light = new THREE.DirectionalLight(color, intensity);
+    light.position.set(0, 5, 0);
+    light.target.position.set(0, 0.5, 0);
+    scene.add(light);
+    scene.add(light.target);
+}
+
+// Lower light
+{
+    const color = 0xFFFFFF;
+    const intensity = 2;
+    const light = new THREE.DirectionalLight(color, intensity);
+    light.position.set(0, -5, 0);
+    light.target.position.set(0, 0.5, 0);
+    scene.add(light);
+    scene.add(light.target);
+}
+
+const objLoader = new THREE.GLTFLoader();
+objLoader.load('assets/brain.gltf', (root) => {
+  scene.add(root.scene.children[2]);
+});
+
+function render() {
+  renderer.render(scene, camera);
+
+  requestAnimationFrame(render);
+}
+
+requestAnimationFrame(render);

templates/scripts.nj

@@ -3,3 +3,9 @@
 <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.5.1/chart.min.js" integrity="sha512-Wt1bJGtlnMtGP0dqNFH1xlkLBNpEodaiQ8ZN5JLA5wpc1sUlk/O5uuOMNgvzddzkpvZ9GLyYNa8w2s7rqiTk5Q==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
 <script src="javascript/alcohol-use-disorder.js"></script>
 <script src='javascript/main.js'></script>
+<script src="javascript/three.js"></script>
+<script src="javascript/OBJLoader.js"></script>
+<script src="javascript/GLTFLoader.js"></script>
+<script src="javascript/MTLLoader.js"></script>
+<script src="javascript/OrbitControls.js"></script>
+<script src="javascript/brain.js"></script>

templates/what-is-cerebellum.nj

@@ -6,5 +6,7 @@
 <div class='row'>
   <div class='column'>
     <p>Cerebellum is one of the major controlling areas in terms of motor function: that means moving our bodies and keeping our balance ...</p>
+
+    <div id='brain-container'></div>
   </div class='column'>
 </div>