Morphs from Archicad acting weird when using path tracer

Development Getting Started & Setup
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1

I am importing an Archicad file with some morphs in it and when I turn on the path tracer it renders weird stripes. Troubleshooting everything and I can not get rid of these stripes. What to do?

Steps taken:

  • Morphs in Archicad all the same material without any texture
  • export with the newest Datasmith exporter
  • import in Twinmotion keeping the hierarchy (IMPORTANT DETAIL)
  • using a material without any displacement maps or normal maps

without path tracer
without path tracer720×348 34.1 KB
Without path tracer

With Path tracer
With Path tracer720×374 40.4 KB
With path tracer on

When importing the Archicad file and selecting "collapse by material" it seems to be okay.

Looks like a solution, but we want to keep the hierarchy because we want to change out the doors for Twinmotion doors that open in VR.

What could cause these stripes on the morphs?

2

Hi,

have you tried to align the UV/texture and move the origin of the UV on the morph in Archicad via the "Align 3D texture" tool/settings?

It might help if there is something wonky with the uv/texture coordinates.

3

you could also try to assign a material with the "cubic" UV mapping in Twinmotion and see if that helps.

snippet

4

Hi,

thanks for the tip. I tried all the different mappings, but no result. Moving the texture coordinates also did not help. These morphs should be just plain white so even the basic white material would suffice. But no luck getting rid of the stripes. Even when you put on a texture like bricks you see these stripes, so I don't think it is a problem with the texture itself.

5

Hmm, I see.

It could be the normal vectors on the morph as well that are interpolated in a strange way, we don't really have control over that in archicad but what you could try is setting the morph to "soft" and then apply and then set it to "hard" again and maybe that helps.

snippet2

I would probably just make the whitebox model with roof tool and slabs instead of trying to solve it with morps haha.

Unless it's the same as this thread i saw yesterday:

https://twinmotionhelp.epicgames.com/s/question/0D54z0000962f5eCAA/big-problem-with-path-tracer?language=en_US

6

Also tried that trick. No results.

And if it was one building I would make it with the roof tool, but it is all the surrounding buildings.

Schermafbeelding 2023-05-16 165822
Schermafbeelding 2023-05-16 165822720×462 58.1 KB

7

Almost certainly the same problem as in the thread you followed, seems to be the most prevalent issue for a few months now.

Adding Depth-of-Field solves the problem for me most of the time.

8

Thanks! It is kind of a work around for now. Depth of field makes the lines blurry enough to hide them. So, not solved but good enough for the moment.