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There is a bug in the dgi calculation of glarendx when sources are behind the viewer. Raphael Compagnon wrote this particular formula, and I am not sure what is wrong with it. I will try writing to him about it again. The 24% missing samples has to do with an insufficient view as Rob points out.

I also recommend looking into the newer evalglare program.

There is a bug in the dgi calculation of glarendx when sources are behind the viewer. Raphael Compagnon wrote this particular formula, and I am not sure what is wrong with it. I will try writing to him about it again. The 24% missing samples has to do with an insufficient view as Rob points out.

I also recommend looking into the newer evalglare program.

P.S. to the above. I have checked in a fix to the glarendx program, which will need to be recompiled from source until the distributions update. You can find & download it from the CVS repository https://www.radiance-online.org/cgi-bin/viewcvs.cgi/ray/src/util/glarendx.c?view=log