ARGeometryElement

A container for index data, such as vertex indices of a face.

Declaration

class ARGeometryElement

ARMeshGeometry uses geometry-elements to store face data (see faces). Each face is defined by the primitive type, for example, ARGeometryPrimitiveType.triangle.

To demonstrate, an ARMeshGeometry instance with two triangle-type faces results in the following configuration:

faces count = 2
faces indexCountPerPrimitive = 3 (because primitiveType is ARGeometryPrimitiveType.triangle)
faces bytesPerIndex = 4 (because vertex indices are the type UInt32)
The buffer’s total size in bytes = count * indexCountPerPrimitive * bytesPerIndex (which in this case, is 2 * 3 * 4 = 24 bytes)