vpTracePixel - print a trace of the voxels composited into a pixel
vpTracePixel(vpc, trace_u, trace_v)
- vpContext *vpc;
- int trace_u, trace_v;
- 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,
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.