[HOU-2793] Displacement with TriPlanars tearing mesh apart

[sebastian_orosz]

Hi,

I struggled the whole weekend with a displacement problem. I'm using some mixed TriPlanars and the result is that the mesh gets torn, thousands of (micro) holes. I tried to fiddle around with these options:

- With and without displacement shift (small negative values)
- Displacement edge length
- Normals in all variations
- Cranking up the base resolution of the mesh to insane values
- Used only 1 TriPlanar (no mix of many) and set the texture blur to 1 to get that smoothed out

The only thing that works: Lowering the resolution of the mesh and smoothing it out while loosing too much detail. That is not an option. So how can I get rid of this?

[bdancer]

Screenshots + .hip file may help a lot.

[sebastian_orosz]

Where can I send the hip to? Upload in here is not possible due to size limitations. (Filesize is around 25MB)

[bdancer]

There is an email in my signature andrei.izrantcev@chaosgroup.com you could send files there or to support@chaosgroup.com.

[tsvetomira.girginova]

Dear sebastian_orosz, hello.

Excuse us for the delayed response.
I have investigated you scene and made similar setup in 3dsMax for comparison.

Could approve the following:

• the white artifacts are visible, yes
• normals are okay
• with other displacement textures the artifacts are seen, but in different amount
• decreasing the Displacement amount will limit the artifacts
• converting the geo to other formats could also limit the artifacts

In conclusion, details about the geo will be highly appreciated - its creation process or where it is gathered from.
If it's made by you through a simulation, please share with us the .hip again by e-mail and use V-Ray > Pack Scene.

The geometry type, scale and units have to be considered once more to define the issue.
In addition, I have logged it in our system for further investigation.

Hope it won't cause you any inconvenience to share the requested above.

Best regards,
TS