V-Ray Rounded Edges Missing vs Modo

[andycf]

Hi all,

I seem to be having a problem with the Rounded Edge shader in V-Ray for Modo.

A lot of the 3d work in our studio involves flooring, so as you can imagine we spend a lot of time rendering planks and tiles! We currently use Modo's internal renderer for the bulk of our work and make heavy use of the excellent Rounded Edge shader to create realistic edges and micro bevels to the flooring.

I would love to move over to using V-Ray for the majority of our work however I seem to have a constant issue getting V-Ray's Rounded Edge shader to work consistently across a floor. To put it simply it just leaves gaps in certain areas of the floor where the effect isn't applied. I've created a very simple scene and attached screenshots below to demonstrate (effect exaggerated).

• It doesn't matter whether I am using a Modo Material in V-Ray and the Rounded Edge settings in there or a native V-Ray Material and the Rounded Edge settings from the Mtl Common rollout, there are still areas where no affect is applied.
• It doesn't matter whether I am using Blinn, Phong, GGX or Ward.
• It doesn't matter whether I am rendering in Adaptive, Progressive, V-Ray RT or V-Ray GPU.
• This always happens in V-Ray across multiple scenes, different lighting set-ups, even though Modo's always works fine.
• There are no flipped or duplicate polygons in this example. Planks are all aligned fine. Only a simple 6 polygon box with Catmull-Clark Sub-D in Modo. (Issue is even worse with no Catmull-Clark Sub-D, more gaps in the Rounded Edge effect!)

Does anyone else get this issue and is there any way of fixing it? Is there something else I have to do/add in V-Ray to get the effect to work properly?

Would love to get to the bottom of this so I can transition our work into V-Ray for Modo!

Cheers,

Andy

[vladimir.nedev]

Very strange, can you attach a sample scene that has this issue ?

Greetings,
Vladimir Nedev

[boyan]

Hey, Andy,

Thank you for the feedback. Any chance to get the scene file? If you can not do that, please give us more details about the behavior such as share with us the wireframe or what is the size of the floor. What kind of AA sampler you're used? What is the render resolution?

Cheers,

Edit: The problem might be the size of the floor and the size of the rounded edges.

[boyan]

Hi, Andy,

Please disable the "Raytrace" option (V-Ray material -> ) in order to achieve the Modo result.

Cheers,

[andycf]

Hi Vladimir and Boyan. Thanks for the replies.

I've attached this sample scene to my message for you guys to have a look at. I must say that this issue happens in V-Ray on any scene we create in our studio while in the internal Modo renderer the effect is always works fine.

We do ALOT of flooring renders (more 3D/CGI photo-comps than anything else) and at the moment this issue is stopping moving over to V-Ray fully as the Rounded Edge shader isn't reliable. As mentioned above me make heavy use of this feature in our workflow as it allows us to add a realistic 'gap' to customer's flooring products and recreate fine micro bevels that are both easily controlled and flexible that a modelling solution wouldn't give us.

I should of mentioned I have tried turning the Raytrace option on and off and I seem to end up with no Rounded Edge at all? (Please see attached image.)

Thanks again,

Andy

[boyan]

Hey, Andy,

Thank you for the scene. Change mesh subdvis to Face (now is Catmull-Clark) when you disable the Raytrace option. I think Modo has ignored it when Rounded Edge shader is enabled. The best way to avoid this behavior is to add distance between edges. I've logged that to our system.

Cheers,