Print a trace of the voxels composited into a pixel
#include <volpack.h>
\$1 vpTracePixel(vpc, trace_u, trace_v)
vpContext *vpc; int trace_u, trace_v;
VolPack context from vpCreateContext.
Intermediate image coordinates of the pixel to trace.
This routine is for debugging the rendering algorithms. If (trace_u, trace_v) is a valid set of coordinates in the intermediate image then a printout appears during rendering showing a trace of all of the voxels that contribute to the pixel. The intermediate image is not the same as the final image; see vpGetvpSetImage(3).
The VolPack library must be compiled with the -DDEBUG compiler option for this function to have any effect.