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137 lines
5.9 KiB
137 lines
5.9 KiB
2 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<base href="../../../" />
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<script src="page.js"></script>
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<link type="text/css" rel="stylesheet" href="page.css" />
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</head>
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<body>
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<h1>[name]</h1>
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<p class="desc">
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A class containing utility functions for [page:BufferGeometry BufferGeometry] instances.
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</p>
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<h2>Methods</h2>
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<h3>[method:Object computeMikkTSpaceTangents]( [param:BufferGeometry geometry], [param:Object MikkTSpace], [param:Boolean negateSign] = true )</h3>
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<ul>
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<li>geometry -- Instance of [page:BufferGeometry].</li>
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<li>MikkTSpace -- Instance of <i>examples/jsm/libs/mikktspace.module.js</i>, or <i>mikktspace</i> npm package. Await <i>MikkTSpace.ready</i> before use.
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<li>negateSign -- Whether to negate the sign component (.w) of each tangent. Required for normal map conventions in some formats, including glTF.</li>
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</ul>
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<p>
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Computes vertex tangents using the [link:http://www.mikktspace.com/ MikkTSpace] algorithm.
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MikkTSpace generates the same tangents consistently, and is used in most modelling tools and
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normal map bakers. Use MikkTSpace for materials with normal maps, because inconsistent
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tangents may lead to subtle visual issues in the normal map, particularly around mirrored
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UV seams.
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</p>
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<p>
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In comparison to this method, [page:BufferGeometry.computeTangents] (a
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custom algorithm) generates tangents that probably will not match the tangents
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in other software. The custom algorithm is sufficient for general use with a
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[page:ShaderMaterial], and may be faster than MikkTSpace.
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</p>
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<p>
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Returns the original [page:BufferGeometry]. Indexed geometries will be de-indexed.
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Requires position, normal, and uv attributes.
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</p>
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<h3>[method:Object computeMorphedAttributes]( [param:Mesh | Line | Points object] )</h3>
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<p>
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object -- Instance of [page:Mesh Mesh] | [page:Line Line] | [page:Points Points].<br /><br />
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Returns the current attributes (Position and Normal) of a morphed/skinned [page:Object3D Object3D] whose geometry is a
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[page:BufferGeometry BufferGeometry], together with the original ones: An Object with 4 properties:
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`positionAttribute`, `normalAttribute`, `morphedPositionAttribute` and `morphedNormalAttribute`.
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Helpful for Raytracing or Decals (i.e. a [page:DecalGeometry DecalGeometry] applied to a morphed Object
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with a [page:BufferGeometry BufferGeometry] will use the original BufferGeometry, not the morphed/skinned one,
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generating an incorrect result.
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Using this function to create a shadow Object3D the DecalGeometry can be correctly generated).
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</p>
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<h3>[method:Number estimateBytesUsed]( [param:BufferGeometry geometry] )</h3>
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<p>
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geometry -- Instance of [page:BufferGeometry BufferGeometry] to estimate the memory use of.<br /><br />
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Returns the amount of bytes used by all attributes to represent the geometry.
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</p>
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<h3>[method:InterleavedBufferAttribute interleaveAttributes]( [param:Array attributes] )</h3>
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<p>
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attributes -- Array of [page:BufferAttribute BufferAttribute] instances.<br /><br />
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Interleaves a set of attributes and returns a new array of corresponding attributes that share
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a single InterleavedBuffer instance. All attributes must have compatible types. If merge does not
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succeed, the method returns null.
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</p>
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<h3>[method:BufferAttribute mergeBufferAttributes]( [param:Array attributes] )</h3>
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<p>
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attributes -- Array of [page:BufferAttribute BufferAttribute] instances.<br /><br />
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Merges a set of attributes into a single instance. All attributes must have compatible properties
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and types, and [page:InterleavedBufferAttribute InterleavedBufferAttributes] are not supported. If merge does not succeed, the method
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returns null.
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</p>
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<h3>[method:BufferGeometry mergeBufferGeometries]( [param:Array geometries], [param:Boolean useGroups] )</h3>
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<p>
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geometries -- Array of [page:BufferGeometry BufferGeometry] instances.<br />
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useGroups -- Whether groups should be generated for the merged geometry or not.<br /><br />
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Merges a set of geometries into a single instance. All geometries must have compatible attributes.
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If merge does not succeed, the method returns null.
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</p>
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<h3>[method:BufferGeometry mergeGroups]( [param:BufferGeometry geometry] )</h3>
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<p>
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geometry -- Instance of [page:BufferGeometry BufferGeometry] to merge the groups of.<br /><br />
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Merges the [page:BufferGeometry.groups groups] for the given geometry.
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</p>
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<h3>[method:BufferGeometry mergeVertices]( [param:BufferGeometry geometry], [param:Number tolerance] )</h3>
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<p>
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geometry -- Instance of [page:BufferGeometry BufferGeometry] to merge the vertices of.<br />
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tolerance -- The maximum allowable difference between vertex attributes to merge. Defaults to 1e-4.<br /><br />
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Returns a new [page:BufferGeometry BufferGeometry] with vertices for which all similar vertex attributes
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(within tolerance) are merged.
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</p>
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<h3>[method:BufferGeometry toCreasedNormals]( [param:BufferGeometry geometry], [param:Number creaseAngle] )</h3>
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<p>
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geometry -- The input geometry. <br />
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creaseAngle -- The crease angle. <br /><br />
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Creates a new, non-indexed geometry with smooth normals everywhere except faces that meet at an angle greater than the crease angle.
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</p>
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<h3>[method:BufferGeometry toTrianglesDrawMode]( [param:BufferGeometry geometry], [param:TrianglesDrawMode drawMode] )</h3>
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<p>
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geometry -- Instance of [page:BufferGeometry BufferGeometry].<br />
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drawMode -- The draw mode of the given geometry. Valid inputs are `THREE.TriangleStripDrawMode` and `THREE.TriangleFanDrawMode`.<br /><br />
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Returns a new indexed geometry based on `THREE.TrianglesDrawMode` draw mode. This mode corresponds to the `gl.TRIANGLES` WebGL primitive.
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</p>
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<h2>Source</h2>
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<p>
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[link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/utils/BufferGeometryUtils.js examples/jsm/utils/BufferGeometryUtils.js]
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</p>
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</body>
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</html>
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