Standard meta data keys

Meta data keys that begin with "Ptex" are reserved.

Standard Ptex keys are documented in the following table.

PtexFaceVertCounts int32 Number of vertices for each face. one value per face
PtexFaceVertIndices int32 Index of each face vert within PtexVertPositions array. one value per vertex per face
PtexVertPositions float 3d position of each vertex. three values per vertex

The PtexFaceVertCounts, PtexFaceVertIndices, and PtexVertPositions can be used to describe geometry on which the Ptex texture can be mapped. This data isn't used directly by the Ptex library but can be used by 3d painting programs, Ptex texture viewers, or similar applications.