211     ray transray;  in shade_transmission()  local
214     transray.intstruct = incident->intstruct; /* what thread are we   */  in shade_transmission()
215     transray.depth = incident->depth - 1; /* go up a level in recursion depth */  in shade_transmission()
216     transray.flags = RT_RAY_REGULAR; /* infinite ray, to start with */  in shade_transmission()
217     transray.serial = incident->serial + 1; /* update serial number */  in shade_transmission()
218     transray.mbox = incident->mbox;  in shade_transmission()
219     transray.o = *hit;  in shade_transmission()
220     transray.d = incident->d; /* ray continues along incident path */  in shade_transmission()
221     transray.o = Raypnt(&transray, EPSILON); /* avoid numerical precision bugs */  in shade_transmission()
222     transray.maxdist = FHUGE; /* take any intersection */  in shade_transmission()
223     transray.scene = incident->scene; /* global scenedef info */  in shade_transmission()
224     col = trace(&transray); /* trace transmission ray */  in shade_transmission()
226     incident->serial = transray.serial;  in shade_transmission()