472     vector curpos, tmax, tdelta, pdeltaX, pdeltaY, pdeltaZ, nXp, nYp, nZp;  in grid_intersect()  local
492         tmax.x = FHUGE;  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()
511         tmax.y = FHUGE;  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()
530         tmax.z = FHUGE;  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()
554     nXp = Raypnt(ry, tmax.x);  in grid_intersect()
555     nYp = Raypnt(ry, tmax.y);  in grid_intersect()
556     nZp = Raypnt(ry, tmax.z);  in grid_intersect()
560         if (tmax.x < tmax.y && tmax.x < tmax.z) {  in grid_intersect()
570             if (ry->maxdist < tmax.x || curvox.x == out.x)  in grid_intersect()
573             tmax.x += tdelta.x;  in grid_intersect()
579         else if (tmax.z < tmax.y) {  in grid_intersect()
589             if (ry->maxdist < tmax.z || curvox.z == out.z)  in grid_intersect()
592             tmax.z += tdelta.z;  in grid_intersect()
608             if (ry->maxdist < tmax.y || curvox.y == out.y)  in grid_intersect()
611             tmax.y += tdelta.y;  in grid_intersect()