k3d/share/shaders/k3d_grids_disp.sl:31:float ss0, tt0;
k3d/share/shaders/k3d_grids_disp.sl:33:rotate2d(s, t, radians(rotation0), 0.5, 0.5, ss0, tt0);
k3d/share/shaders/k3d_grids_disp.sl:34:ss0 = repeat(ss0, freq0);
