A class containing utility functions for BufferGeometry instances.
geometry -- A BufferGeometry instance, which must have index, position, normal, and uv attributes.
Calculates and adds tangent attribute to a geometry.
geometries -- Array of BufferGeometry instances.
Merges a set of geometries into a single instance. All geometries must have compatible attributes. If merge does not succeed, the method returns null.
attributes -- Array of BufferAttribute instances.
Merges a set of attributes into a single instance. All attributes must have compatible properties and types, and InterleavedBufferAttributes are not supported. If merge does not succeed, the method returns null.
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