I presume you are referring to the Heightfield Export LWO node. To make this work, create a Heightfield Generate and position it below your crater in the network, with the output of the crater network plugged into the Shader Input of the Heightfield Generate. Match the position of your Heightfield Generate to your Crater shader, add your Heightfield Export LWO after the Heightfield Generate, click Generate in the Heightfield Generate node and then export in your Heightfield Export LWO.
- Oshyan
