Chaos Corona for 3ds Max > [Max] Feature Requests

Impact of Mesh Topology on the Refraction Behavior of Glass (Curved Surfaces)

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James Vella:
Blender file attached (Blender 4.1 required), just go to render mode in viewport and click on the object and rotate it, it looks fine from all angles.

ATa:
Yeah, the 4. Lens.jpg you uploaded shows the same refraction issue that I have. As you said, it seems it's time for Corona developers to tackle this refraction issue. I was hoping the new physical materials in Corona could handle it, but they can't. Considering the fact that a vast number of professional 3D artists sync their meshes between CAD-based 3D software like Rhino and 3ds Max, it could be a priority to resolve! 

Let's enhance rendering to be more realistic and seamless for everyone!🤠

ATa:
Corona Team,

Today, I decided to investigate further into the jagged refraction issue on glass renders. I applied the retopology modifier to the mesh to convert it into quads, hoping it would solve the problem. However, as you can see from the attached pictures, the issue has worsened.

As discussed previously, this mesh is a closed OBJ export from CAD-based software (Rhino7). It's a simple model without complexity, including its smoothing groups and normals. Despite testing various methods like weighted normals, the problem persists, indicating a rendering issue rather than a modeling one.

For 3D artists, importing/exporting between CAD and non-CAD software and adjusting topology (quad or non-quad) are standard practices. These modeling techniques should not negatively impact rendering.

Please provide an explanation and resolution for this bug in future updates, or if I am mistaken, help me resolve it, as this issue is quite frustrating.

Thank you for your attention to this matter.

The OBJ mesh is attached for reference.

maru:
Sorry for reviving such an old thread, but I have some findings:
- The issue is related to refraction, not reflection. You can check this by assigning a Corona Legacy Material to the object and then enabling refraction only without reflection (or reflection only without refraction).
- The object renders the same (with the jagginess error) in both Corona and V-Ray. I doubt that both renderers are doing something wrong, so I would blame the CAD > Max import process. Something gets wrong with the mesh smoothing and it results in broken refraction.

Unfortunately, I don't think there is anything we could fix in Corona here.

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