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

rtcGetGeometryTransformEx - returns the interpolated instance
transformation for an instance of an instance array geometry for the
specified time.
    

#include <embree4/rtcore.h>
void rtcGetGeometryTransformEx(
  RTCGeometry geometry,
  unsigned int instPrimID,
  float time,
  enum RTCFormat format,
  void* xfm
);

The rtcGetGeometryTransformEx function returns the interpolated local to world transformation (xfm parameter) of the instPrimID-th instance of an instance array geometry (geometry parameter) for a particular time (time parameter in range [0, 1]) in the specified format (format parameter). The function can also be used when geometry refers to a regular instance, but then the instPrimID has to be 0.

Possible formats for the returned matrix are:

•
RTC_FORMAT_FLOAT3X4_ROW_MAJOR: The 3×4 float matrix is laid out in row-major form.
•
RTC_FORMAT_FLOAT3X4_COLUMN_MAJOR: The 3×4 float matrix is laid out in column-major form.
•
RTC_FORMAT_FLOAT4X4_COLUMN_MAJOR: The 3×4 float matrix is laid out in column-major form as a 4×4 homogeneous matrix with last row equal to (0, 0, 0, 1).

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

[RTC_GEOMETRY_TYPE_INSTANCE_ARRAY]