OTOY Forums

Hi,
it's been months of research of a workflow that works and every time i give up octane and render with modo.
I still can't figure it out how to make a zbrush displacement work into octane, and it's disappointing.
In the joined picture you can see the same render with modo and the other with octane.

the displacement map is a 32bit exr with mid value of 0
the ray epsilon in octane is of 1 um
i'm running octane 3
i have the same problem with octane on cinema 4d

do we have a known solution for this problem?

Hi - are you able to provide the scene pls? Then I can submit it to Otoy to get a response. Also, have you tried using the Render Cache displacement mapping with the OctaneRender for Modo plugin?

Paul

Do you mean activating the "use modo render cache" in the octane preferences?
if yes, yes it's enabled
i'm uploading the scene for you

The Octane displacement mapping is indeed producing artifacts. I have uploaded the scene to Otoy, who can investigate further.

You can use Modo displacement by a) ticking Preferences->Rendering->Octane->Use Modo Render Cache and b) ticking Kernel->Setting->Polygon Displacement. This will ignore the displacement map in Modo, and will instead use the micro-polys generated by the Modo renderer. Unfortunately I ran out of memory on my 16GB Windows PC doing this, but you might have better hardware. You can reduce the tessellation rate of the displacement polys via the Renderer->Settings->Geometry settings - but I don't know enough about those settings to get it working.

You could also try scaling the geometry 100x if the cause of the problem is the ray epsilon.

Paul

Been waiting for Otoy to do something about this for a while in standalone. Frustrating as hell.

Yeah, it's not like a 'niche' thing, displacement is quite fundamental and it's been really surprising to see very old posts about this problem that keep coming back after ages with no solution...

Hi, I know that I can use the Modo internal displacement map!
But with the Octane displacement node in Modo I get some strange results (artefact's in form of polygons).

You can see sort of a polygonal or chase pattern! Is this know?
With the Modo displacement map I don't get this?

Hi, I know that I can use the Modo internal displacement map!
But with the Octane displacement node in Modo I get some strange results (artefact's in form of polygons).

You can see sort of a polygonal or chase pattern! Is this know?
With the Modo displacement map I don't get this?

This occurs when you have very long, thin triangles with a displacement map applied. It /may/ be improved with release 3.04.2 (since there have been some tweaks to displacement map rendering). But removing the long, thin triangles is worth a try too.

You can test with the pre-release of the 3.04.2 version of the Modo plugin at https://render.otoy.com/customerdownloa ... _64bit.exe.

Paul

thanks for the quick answer ... I will test the new plugin!