javascript
/
three.js
spogulis no https://github.com/tazdij/three.js.git


			
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		<h1>[name]</h1>

		<p class="desc">
		Triangular face used in [page:Geometry]. These are created automatically for all
		standard geometry types, however if you are building a custom geometry you will have to
		create them manually.
		</p>

		<h2>Code Example</h2>

		<code>
		const material = new THREE.MeshStandardMaterial( { color : 0x00cc00 } );

		//create a triangular geometry
		const geometry = new THREE.Geometry();
		geometry.vertices.push( new THREE.Vector3( -50, -50, 0 ) );
		geometry.vertices.push( new THREE.Vector3(  50, -50, 0 ) );
		geometry.vertices.push( new THREE.Vector3(  50,  50, 0 ) );

		//create a new face using vertices 0, 1, 2
		const normal = new THREE.Vector3( 0, 0, 1 ); //optional
		const color = new THREE.Color( 0xffaa00 ); //optional
		const materialIndex = 0; //optional
		const face = new THREE.Face3( 0, 1, 2, normal, color, materialIndex );

		//add the face to the geometry's faces array
		geometry.faces.push( face );

		//the face normals and vertex normals can be calculated automatically if not supplied above
		geometry.computeFaceNormals();
		geometry.computeVertexNormals();

		scene.add( new THREE.Mesh( geometry, material ) );
	</code>

		<h2>Examples</h2>

		<p>
			[example:svg_sandbox svg / sandbox ]<br />
			[example:misc_exporter_obj exporter / obj ]<br />
			[example:webgl_shaders_vector WebGL / shaders / vector ]
		</p>

		<h2>Constructor</h2>

		<h3>[name]( [param:Integer a], [param:Integer b], [param:Integer c], [param:Vector3 normal], [param:Color color], [param:Integer materialIndex] )</h3>
		<p>
		a — Vertex A index.<br />
		b — Vertex B index.<br />
		c — Vertex C index.<br /><br />

		normal — (optional) Face normal ([page:Vector3 Vector3]) or array of vertex normals.
		If a single vector is passed in, this sets [page:.normal], otherwise if an array of three
		vectors is passed in this sets [page:.vertexNormals]<br /><br />

		color — (optional) Face [page:Color color] or array of vertex [page:Color colors].
		If a single vector is passed in, this sets [page:.color], otherwise if an array of three
		vectors is passed in this sets [page:.vertexColors]<br /><br />

		materialIndex — (optional) which index of an array of materials to associate
		with the face.
		</p>

		<h2>Properties</h2>

		<h3>[property:Integer a]</h3>
		<p>
		Vertex A index.
		</p>

		<h3>[property:Integer b]</h3>
		<p>
		Vertex B index.
		</p>

		<h3>[property:Integer c]</h3>
		<p>
		Vertex C index.
		</p>

		<h3>[property:Vector3 normal]</h3>
		<p>
		Face normal - vector showing the direction of the Face3. If calculated automatically
		(using [page:Geometry.computeFaceNormals]), this is the normalized cross product of two edges of the
		triangle. Default is *(0, 0, 0)*.
		</p>

		<h3>[property:Color color]</h3>
		<p>
		Face color - for this to be used a material's [page:Material.vertexColors vertexColors] property
		must be set to *true*.
		</p>

		<h3>[property:Array vertexNormals]</h3>
		<p>
		Array of 3 [page:Vector3 vertex normals].
		</p>

		<h3>[property:Array vertexColors]</h3>
		<p>
		Array of 3 vertex colors - for these to be used a material's [page:Material.vertexColors vertexColors] property
		must be set to *true*.
		</p>


		<h3>[property:Integer materialIndex]</h3>
		<p>
		Material index (points to an index in the associated array of materials). Default is *0*.
		</p>

		<h2>Methods</h2>

		<h3>[method:Face3 clone]()</h3>
		<p>Creates a new clone of the Face3 object.</p>

		<h3>[method:Face3 copy]( [param:Face3 face3] )</h3>
		<p>Copy the parameters of another Face3 into this.</p>


		<h2>Source</h2>

		<p>
			[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
		</p>
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