Mixing two vastly different displacement maps?

[kartata]

Hello everyone,

encountered a little problem, when trying to build a large landscape:
I have a height map for a mountainscape on which i tried to put another Quixel displacement for a rocky texture but it seems to mess up everything.
There is positive and negative height information in that texture which I want to use to deform the bigger landscape in both Y+ / Y-, so it either drags everything down or pushes it up

I watched and tried it to solve with this tutorial, but it seems to only work when the displacements sit beneath each other, not when they are supposed to be on top of each other:
https://www.youtube.com/watch?v=yEktSqdoMCU

My only solution as I see it would be to export the .obj and put the rocky displacement on top of that, but since it's 8M tris and the scene is not populated with trees and rocks yet, I will run out of VRAM quickly.

I hope I made clear what problem I ran into and hope that anyone here has a solution for that.

Thanks,
Dave

[bepeg4d]

Hi,
the issue is that Texture Displacement is very limited, and works only with a single image texture node, so you should need to mix the two displacement textures in PhotoShop, or similar, with a lot of tries and errors
Alternative, you could try with Vertex Displacement, adding the subdivisions in the Displacement node, or via Object Layer node. In this case you can use any kind of texture node, even mixed, or composed, but polygon count could be an issue with large landscape scenes

ciao,
Beppe