VRscene vs VRmesh

[DCHA34]

Hi all,
I made a test with the object "JH-719 Armchair by Johannes Hansen" from 3Dsky.org
From 3DS MAX 2023, I exported a .vrscene (left side) and a .vrmesh (rigth side) of this model.

Here's what it looks like in Sketchup :



And here's what it looks like in Vantage 2 :



There's a problem in Sketchup but not in Vantage 2.

[DCHA34]

It seems to be a scale problem.
Scaling in Sketchup ("reducing") the .vrscene file seems to cause problems, whereas scaling the .vrmesh file does not.

EDIT : In the MAX file, there was a VRayDisplacementMod modifier. After conversion to Editable Poly, no more problems in Sketchup.

Is it possible to "Collapse All" the entire 3DS MAX file before exporting .vrscene ?

[natalia.gruzdova]

Hello DCHA34,

Thank you for the examples.

First of all I wanted to share that I have tried to reproduce similar setup with VRayDisplacementMod modifier saved as .vrscene from 3ds max > imported into SketchUp and scaled:



As you can see from the screenshot with this new test scene the issue is not reproducible. You can download all test files in the attachment.

Could you share the 3ds max file for us to test? You can simplify the model - just those ropes with texture and modifier will be enough.

As for other points, I wanted to note that Vantage 2 does not support V-Ray Displacement (2D Mapping and 3D Mapping) - you can find this information in our documentation. This is why the result that you get in Vantage most likely does not include displacement.

Same is with .vrmesh - displacement of Proxy object is not supported. Thought you can bake it in 3ds max if needed following steps described in this article: How to convert V-Ray Displacement modifier to V-Ray Proxy mesh or regular 3ds Max geometry.

Lastly, as for your “Collapse all” question perhaps Collapse Utility is what you are looking for.

[DCHA34]

Hi Natalia,

Thanks for taking the time to test and thanks for the Collapse utility.

I've added a few spheres to your file to illustrate the scale problem and I've attached this image to give you a better idea of the scale problem.

The illustration above is a reduction by a factor of 0.25

[natalia.gruzdova]

Hello DCHA34,

Testing further with added spheres I would like to note that scaling behavior can be seen in 3ds max as well. And this is expected, because scaling the modifier is not the same as scaling the object itself. If the Relative to bbox option is disabled in VRayDisplacementMod - displacement height is expressed in generic world units where white areas in the displacement map correspond to a displacement of 1 generic unit - hence the result.
But it can be uniformly scaled (both in 3ds max and later as .vrscene in SketchUp) by enabling the Relative to bbox option, so that displacement height is based on the bounding box of the objects. Just note that you will need to adjust the amount most likely.



Or alternatively bake Displacement into .vrmesh as shared in the previous post.
I am attaching test scenes as well.

[DCHA34]

Hi Natalia,
thank you for all these explanations.
I will take a closer look.
Thanks again.