rtcSetGeometryTimeStepCount(3) Embree Ray Tracing Kernels 3 rtcSetGeometryTimeStepCount(3) 

rtcSetGeometryVertexAttributeCount - sets the number of vertex
  attributes of the geometry


#include <embree3/rtcore.h>
void rtcSetGeometryVertexAttributeCount(
  RTCGeometry geometry,
  unsigned int vertexAttributeCount
);

The rtcSetGeometryVertexAttributeCount function sets the number of slots (vertexAttributeCount parameter) for vertex attribute buffers (RTC_BUFFER_TYPE_VERTEX_ATTRIBUTE) that can be used for the specified geometry (geometry parameter).

This function is supported only for triangle meshes (RTC_GEOMETRY_TYPE_TRIANGLE), quad meshes (RTC_GEOMETRY_TYPE_QUAD), curves (RTC_GEOMETRY_TYPE_CURVE), points (RTC_GEOMETRY_TYPE_POINT), and subdivision geometries (RTC_GEOMETRY_TYPE_SUBDIVISION).

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

[rtcNewGeometry], [RTCBufferType]