rtcSetGeometryVertexAttributeTopology(3) Embree Ray Tracing Kernels 4 rtcSetGeometryVertexAttributeTopology(3) 

rtcSetGeometryVertexAttributeTopology - binds a vertex
  attribute to a topology of the geometry


#include <embree4/rtcore.h>
void rtcSetGeometryVertexAttributeTopology(
  RTCGeometry geometry,
  unsigned int vertexAttributeID,
  unsigned int topologyID
);

The rtcSetGeometryVertexAttributeTopology function binds a vertex attribute buffer slot (vertexAttributeID argument) to a topology (topologyID argument) for the specified subdivision geometry (geometry argument). Standard vertex buffers are always bound to the default topology (topology 0) and cannot be bound differently. A vertex attribute buffer always uses the topology it is bound to when used in the rtcInterpolate and rtcInterpolateN calls.

A topology with ID i consists of a subdivision mode set through rtcSetGeometrySubdivisionMode and the index buffer bound to the index buffer slot i. This index buffer can assign indices for each face of the subdivision geometry that are different to the indices of the default topology. These new indices can for example be used to introduce additional borders into the subdivision mesh to map multiple textures onto one subdivision geometry.

On failure an error code is set that can be queried using rtcGetDeviceError.

[rtcSetGeometrySubdivisionMode], [rtcInterpolate], [rtcInterpolateN]