I've been trying to mask by altitude the fractal warp shader but all it does is turn off the fractal warp. Any help or suggestions gratefully received.
This will work only if the fractal warp is on a side branch, so that the main branch has already generated some displacement for the altitude constraint to be aware of. This limitation applies to all of the warp shaders that warp their main input, because the amount of warp is calculated before the main input is calculated - therefore the warp has no knowledge of the input.
Thanks Matt