472     vector curpos, tmax, tdelta, pdeltaX, pdeltaY, pdeltaZ, nXp, nYp, nZp;  in grid_intersect()  local
486     curpos = Raypnt(ry, tnear);  in grid_intersect()
487     pos2grid(g, &curpos, &curvox);  in grid_intersect()
498         tmax.x = offset + ((voxel2x(g, curvox.x) - curpos.x) / ry->d.x);  in grid_intersect()
503         tmax.x = offset + ((voxel2x(g, curvox.x + 1) - curpos.x) / ry->d.x);  in grid_intersect()
517         tmax.y = offset + ((voxel2y(g, curvox.y) - curpos.y) / ry->d.y);  in grid_intersect()
522         tmax.y = offset + ((voxel2y(g, curvox.y + 1) - curpos.y) / ry->d.y);  in grid_intersect()
536         tmax.z = offset + ((voxel2z(g, curvox.z) - curpos.z) / ry->d.z);  in grid_intersect()
541         tmax.z = offset + ((voxel2z(g, curvox.z + 1) - curpos.z) / ry->d.z);  in grid_intersect()
574             curpos = nXp;  in grid_intersect()
593             curpos = nZp;  in grid_intersect()
612             curpos = nYp;  in grid_intersect()