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Man Pages
vpTracePixel(3) FreeBSD Library Functions Manual vpTracePixel(3)

vpTracePixel - print a trace of the voxels composited into a pixel

#include <volpack.h>
vpResult
vpTracePixel(vpc, trace_u, trace_v)
vpContext *vpc;
int trace_u, trace_v;

vpc
VolPack context from vpCreateContext.
trace_u, trace_v
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.

VolPack(3)
VolPack

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