Strange Highlights in Vray/Max Design 2012

[BKE]

I am a brand new VRAY user. I have been reading/viewing all the tutorials that I can find. I have attached a file to this posting. There are strange highlights on the trim. In some instances, there is window trim that is under an 8'-0" deep porch. Somehow the 1 1/2" deep trim piece is catching light and reflecting it upwards against the building. The trim is a basic white VRAY material. I welcome any suggestions.

Thanks!!

Brian

[anejo]

Could you post your vray setting?

[BKE]

Thanks, Anejo. I have attached all of the settings as screen shots. I also included my Sun settings. I will put the Material settings in the next reply.

Thanks again!

Brian

[BKE]

This post has my material settings. The white "Trim Boards" material is casting the unusual light. Thanks!

[anejo]

There are a couple thing you can try. The first is changing the Image Sampler (antia-aliasing) from Adaptive Subdivsion to Adaptive DMC. However, keeping your current filter (Area, size 1.5)

 

The only other thing i see that unusal is in the Vray Sun parameter, and that's the Photon emit radius. I don't have a complete understanding of this parameter, but i've never seen it set this high. You currently have it at 50'. Try lowering that to just a few inches.

 

Hope this help. Good luck!

[RyderSK]

Do a test with VrayOveride material set on gray to see if the problem persists

[Ismael]

http://www.spot3d.com/vray/help/150SP1/render_examples_advancedimap.htm

 

See "Check sample visibility" ...

[BKE]

Anejo suggested:

There are a couple thing you can try. The first is changing the Image Sampler (antia-aliasing) from Adaptive Subdivsion to Adaptive DMC. However, keeping your current filter (Area, size 1.5)

 

The only other thing i see that unusal is in the Vray Sun parameter, and that's the Photon emit radius. I don't have a complete understanding of this parameter, but i've never seen it set this high. You currently have it at 50'. Try lowering that to just a few inches.

 

Hope this help. Good luck!

 

The Adaptive DMC did not help matters. If anything, the strange highlights were enhanced.

The Vray Sun parameter WORKED! I brought the photon emit radius to 6" and the shadow bias back to 2.25". I am not certain which one of those were the determining factor. It might actually be the shadow bias. I had 'tweaked it' to make it brighter beneath the porch. However, I adjusted a lot of other settings along the way and did not recall the possibility of that 'tweak' being my problem maker! Thank you.

 

RyderSK suggested:

Do a test with VrayOveride material set on gray to see if the problem persists.

I did not try that on the material since the sun settings corrected the problem. HOWEVER - I researched this and it will help me to keep the grass from making my building green. This is a very user friendly, powerful shader override. Thank you!

 

Ismael suggested:

http://www.spot3d.com/vray/help/150S...vancedimap.htm

See "Check sample visibility" ...

That is a great technical paper to help me understand these settings, thank you.

 

I welcome any other observations of my settings.

Thank you all!!

Brian