491     if (fabs(ry->d.x) < EPSILON) {  in grid_intersect()
497     else if (ry->d.x < 0.0) {  in grid_intersect()
498         tmax.x = offset + ((voxel2x(g, curvox.x) - curpos.x) / ry->d.x);  in grid_intersect()
499         tdelta.x = g->voxsize.x / -ry->d.x;  in grid_intersect()
503         tmax.x = offset + ((voxel2x(g, curvox.x + 1) - curpos.x) / ry->d.x);  in grid_intersect()
504         tdelta.x = g->voxsize.x / ry->d.x;  in grid_intersect()
510     if (fabs(ry->d.y) < EPSILON) {  in grid_intersect()
516     else if (ry->d.y < 0.0) {  in grid_intersect()
517         tmax.y = offset + ((voxel2y(g, curvox.y) - curpos.y) / ry->d.y);  in grid_intersect()
518         tdelta.y = g->voxsize.y / -ry->d.y;  in grid_intersect()
522         tmax.y = offset + ((voxel2y(g, curvox.y + 1) - curpos.y) / ry->d.y);  in grid_intersect()
523         tdelta.y = g->voxsize.y / ry->d.y;  in grid_intersect()
529     if (fabs(ry->d.z) < EPSILON) {  in grid_intersect()
535     else if (ry->d.z < 0.0) {  in grid_intersect()
536         tmax.z = offset + ((voxel2z(g, curvox.z) - curpos.z) / ry->d.z);  in grid_intersect()
537         tdelta.z = g->voxsize.z / -ry->d.z;  in grid_intersect()
541         tmax.z = offset + ((voxel2z(g, curvox.z + 1) - curpos.z) / ry->d.z);  in grid_intersect()
542         tdelta.z = g->voxsize.z / ry->d.z;  in grid_intersect()
547     pdeltaX = ry->d;  in grid_intersect()
549     pdeltaY = ry->d;  in grid_intersect()
551     pdeltaZ = ry->d;  in grid_intersect()
640     if (ry->d.x == 0.0) {  in grid_bounds_intersect()
645         tx1 = (g->min.x - ry->o.x) / ry->d.x;  in grid_bounds_intersect()
646         tx2 = (g->max.x - ry->o.x) / ry->d.x;  in grid_bounds_intersect()
662     if (ry->d.y == 0.0) {  in grid_bounds_intersect()
667         ty1 = (g->min.y - ry->o.y) / ry->d.y;  in grid_bounds_intersect()
668         ty2 = (g->max.y - ry->o.y) / ry->d.y;  in grid_bounds_intersect()
684     if (ry->d.z == 0.0) {  in grid_bounds_intersect()
689         tz1 = (g->min.z - ry->o.z) / ry->d.z;  in grid_bounds_intersect()
690         tz2 = (g->max.z - ry->o.z) / ry->d.z;  in grid_bounds_intersect()