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Author Topic: Forest Pro and Vray reflections  (Read 186 times)

Jim Kessler

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Forest Pro and Vray reflections
« on: November 21, 2017, 06:56:46 PM »
Not sure if this is a Vray issue or a Forest Pro issue, but I have 2 Forest Pro tree objects in a scene, one in front of the other. I have one of them set to not render reflections and the other to go ahead and render reflections. The one that is set to not render reflections is actually cutting its shape out of the ones that are set to render reflections. So in the reflection, I can see the sky cut out in the shape of the trees that aren't supposed to be reflecting. Sounds confusing, maybe the images will help.

Michal Karmazín

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Re: Forest Pro and Vray reflections
« Reply #1 on: November 22, 2017, 11:58:04 AM »
Hi,

It might be caused by the transparency limit value, like in this one: "White pixels on Forest grass with edge mode enabled"

"Looks like, V-Ray exceeded its default transparency limit (which could cause similar render artefacts). I would suggest you to increase Global switches - Max transp. levels (default value is 50). Sometimes may be necessary to modify Secondary rays bias also.

As mentioned in this "Some key notes about Areas->Boundary Checking->Edge mode" related post: "In the case of very high density scatters (like dense grass), many overlapping objects could be generated and V-Ray may exceed its default transparency limit (which can cause render artifacts)". You can find there how to fix it (use lower Density values / increase VRay's Max transp. levels)."


Attaching a sample scene, where you can do some basic testing. Hope that helps.

Best regards,

Jim Kessler

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Re: Forest Pro and Vray reflections
« Reply #2 on: November 22, 2017, 04:38:32 PM »
Raising the Max Transp. Levels did the trick.  Thanks.