I've made simple world curving shader following some online tutorials and cleaning few things up. It's doing its job, however I have small issue where it curves objects that are very close to a camera. So, I am trying to figure out how to start curving only if objects are certain distance form the camera, lets say 20 units or more?
Below is a sub-graph I use to output a value for a vertex position i.e. curve world shader, this is the one I need to figure out how to modify
Before you feed the z position into the Power node, subtract your minimum curving distance from the z to get a signed difference, and then run that through a Max node to take the greater of 0, or that z difference. Then pipe that clamped z value into the Power node.
If your camera is looking in the -z direction, then you'd do something similar, but add the minimum curving distance and then run it through a Min node instead. Either way, what you're doing is moving the vertex of the parabola forward or back along the z axis, then clamping everything closer to the camera to zero so you only see the further branch of the parabola.
