Hi All, I seem to have a re occurring issue when rendering cars with supplied Cad data. I don’t do too many cars so sorry of this is a ‘noob’ question. Anyway it seems that my reflections don’t take into account normal smoothing on the supplied geometry and they become faceted and follow the tesse…

Reflections should take into account the normal smoothing. Can you show us how the reflections look like when the edges are not smoothed?

Hello, thanks for your response, here are the images requested Reflection on supplied CAD by client below Unlocked normal and set to hard edge Set normal angle 30 degrees It looks like there is some smoothing, maybe its the way it has been converted from nurbs. Exactly the same ting happened on…

Yes, a sample scene would help.

hello, Please find attached a sample scene. Let me know if you want anything else thanks Matt sample_scene.zip (4.17 MB)

I’m not sure if it’s possible to get perfect reflections in this case, since even with smooth normals, the reflection rays will start from a flat surface. High quality subdivision can smooth the reflection, but judging by the resolution you are rendering, you will not like the render times… But I ca…

Hi, thanks for the reply, yeah there is a pre scale of 8 on my camera and offset so i can render 10% and get an idea of final res. i think the whole car is 10k across but that issue is still visible, also I cant subdivide as its a dirty nurbs conversion. Last time i remodelled body panels so i coul…

I had this issue before and the high subdivision route worked well, if it is a 10k image I would render it with distributed rendering. Even if render time is increased, I think re-modeling the car it would take longer.

you can’t touch the normals from cad. The way they have them there its set for special crease edges only, so if you just simply unlock and set normal smoothing on everything it wont work anymore. You need to export the normal data as is from cad.

Hi im not quite sure how i can subdivide as its not quads so doesnt smooth well, plus i dont have access to original nurbs surfaces to re tesselate.

[image] Complex V-Ray Shaders baking. you can’t touch the normals from cad. The way they have them there its set for special crease edges only, so if you just simply unlock and set normal smoothing on everything it wont work anymore. You need to export the normal data as is from cad. Hi Dimitr…

dodgy reflections

V-Ray for Maya V-Ray for Maya :: Issues

matthew999 April 1, 2016, 9:02am 11

Hi Dimitry. unfortunately i dont have access to the original nurbs cad.

thanks matt

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dodgy reflections

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