How to mix two displacement maps?

[Admin_KeenSWH]

Hey magicians, I want to mix grass and rocks materials within one shader based on a vertex float attribute that I got, and those grass/rock materials mix nicely except displacement maps. Is there a way to mix two displacement maps within one shader? I tried using Material Mixer node and Mix Texture node but with no luck. Any help would be much appreciated!



Here's what I tried but it didn't work:


Thanks in advance!

[galleon27]

You can't mix two displacement maps using Displacement node. You need to use Vertex Displacement and Vertex Displacement mixer.

[Admin_KeenSWH]

You can't mix two displacement maps using Displacement node. You need to use Vertex Displacement and Vertex Displacement mixer.

Oh this looks good! But can I got a couple of questions.

1. Can I feed my usual grayscale displacement maps into Vertex Displacement node?
2. It looks like I should subdivide my geometry hugely to get result hires enough which loads GPU a lot. Attaching the comparison between vertex displacement vs. usual displacement.

Could you please share a scene so I could check it?

[galleon27]

1. Can I feed my usual grayscale displacement maps into Vertex Displacement node?

You can use displacement maps.

2. It looks like I should subdivide my geometry hugely to get result hires enough which loads GPU a lot. Attaching the comparison between vertex displacement vs. usual displacement.

Just turn on auto-bump and you'll be good. If you need more details, you will have to subdivide the geometry. I suggest to read the manual to learn the differences between the two. https://docs.otoy.com/StandaloneH_STA/S ... cement.htm

[Admin_KeenSWH]

Thanks for the response and providing this info.

But for some reason the scene opens with errors. Can you please check screen in the attachment?
p.s. My config is in the signature.

[juanjgon]

The scene probably comes from an earlier plugin version. Usually, it is safe to ignore these warnings, but some render target settings could be reset to the default values.

Thanks,
-Juanjo

[Admin_KeenSWH]

The scene probably comes from an earlier plugin version. Usually, it is safe to ignore these warnings, but some render target settings could be reset to the default values.

Thanks,
-Juanjo

Oh I see, ok, thanks for the heads up!

[Admin_KeenSWH]

Ok, having downloaded your scene, I did my own tests following your workflow and I still can't understand why it doesn't work for me..

I created Attr. VOP with float attribute cow it has 0 and 1 float values in relevant black/white areas (I double-checked it using visualizers). I plug it to mixing amount and still it doesn't work.. What am I doing wrong?

[Admin_KeenSWH]

Upd. Ignore - me stupid. I just forgot to add cow to Octane's attribute field on that Grid's geo.

[Admin_KeenSWH]

Hmm.. the only problem with this approach though is that now I can't seem to make displacement push the geometry outwards - it's very flat looking like a regular bump now.. Can I ask you to check my simple scene in the attachment please?

Maybe I'm somehow misusing the Gradient node attached to Float Vertex Attr?