Populations showing up under terrain help

[jmadden]

I'm trying to use populations for the first time and I've run into an issue that the tutorials I've seen can't help with. 
I've attached an image of what is happening. Essentially my populations are sitting on some other surface underneath the topmost terrain. 
I've tried linking the other shaders to the populations but nothing works. I've also tried toggling between 'Sampling terrain...' in the seed tab but that doesn't work either. I reduced the issue down and saved a version of my project if you want to mess around with it. 
I'm running version 4.3.18 on a 10.12.6 Mac

PopulationExample.tgd

[Hetzen]

Looks like you need to put the Compute Terrain after your displacements, so TG knows where the surface is.

[Matt]

Looks like you need to put the Compute Terrain after your displacements, so TG knows where the surface is.

You only need the Compute Terrain if you need the updated texture coordinates and normals (although often you do).

There's some other reason it's doing this. I'm investigating it now.

[Matt]

It's the rotation on the planet. It works correctly when I uncheck "Rotate textures with planet" or set the planet rotation to 0. If you don't need that rotation, there's the solution. But that's a bug we'll need to fix.

If you need that planet rotation you may be able to recreate it with a Transform Input Shader between the displacement shaders and the populator, but I would want to move the planet so its centre is at the origin first, as that will allow the transform to be a simple rotation.

[Hetzen]

Looks like you need to put the Compute Terrain after your displacements, so TG knows where the surface is.

You only need the Compute Terrain if you need the updated texture coordinates and normals (although often you do).

There's some other reason it's doing this. I'm investigating it now.

Ahh ok, I only looked at the screen grabs and didn't look at the scene file. I just assumed there was some further displacement happening after the CT node.

[jmadden]

Thank you Matt!