world_render.sky_time += world_render.sky_rate * vg.time_delta;
world_render.sky_rate = vg_lerp( world_render.sky_rate,
world_render.sky_target_rate,
world_render.sky_time += world_render.sky_rate * vg.time_delta;
world_render.sky_rate = vg_lerp( world_render.sky_rate,
world_render.sky_target_rate,