Vray Leaf Material Haze
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Hi everyone - this is my first post after many months of reading the excellent posts here!
I'm posting because I cannot figure out what's going on with this one particular tree type! It seems that the edges are almost transparent.
Here's the back story:
Exported tree model as VRMesh in 3ds Max
Imported VRMesh into Sketchup and re-mapped materialsI have experimented with refraction and transparency/alpha to no avail.
I'm using SketchUp 2013 Pro and Vray 2.0.
See image of straight rendering. You can see the issue at the top where the white background is showing through the leaves. Looks like fog, but there is no fog (multiplier set to 0 in refraction layer for leaf material).
Please help!!!
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I was initially concerned that the issue had to do with materials not being mapped on both sides of surfaces, and it may be just that, but I have no idea how to map materials on specific sides of a VRMesh.
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Doesn't this have something to do with sub pixel mapping? Thought I read that on Peter Guthries blog.
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I was thinking perhaps turbidity settings in Environment.
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I would suggest not using refraction at all but rather a V-Ray two sided material instead. Two sided materials allow for light transmission with out having to use opacity settings or refraction settings.
Take a look at the leaf material I've attached here and test it out in a sample scene. I think using a material like this will give you the desired results.
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Thanks for the thoughts and suggestions for things to look into. I haven't gotten the issue resolved, yet. See this image for a close up of the phenomenon.
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@tedvitale_cg said:
I would suggest not using refraction at all but rather a V-Ray two sided material instead. Two sided materials allow for light transmission with out having to use opacity settings or refraction settings.
Take a look at the leaf material I've attached here and test it out in a sample scene. I think using a material like this will give you the desired results.
Thanks Ted! I'll give it a shot and report back!
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Here's the result using the Oak leaves shared by Ted. What the heck?
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How are you applying the materials? Are you painting them with the paint bucket or are you applying the double sided material with V-Ray? It looks like you used the base material not the 2 Sided. Could you possibly share the model? I'd like to take a look and see whats happening. The last thing I can think of is you're not using the cutout of the leaf so you're getting artifacts rendered from the transparency of the .png file.
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Ted,
I've exported VRMesh from 3DS Max, loaded the VRMessh into SketchUp, and used the Vray material editor to re-map or, as with your Oak leaves, import the materials. In addition, I've erased all of the VRMesh geometry and replaced it with a 2D always-face-camera image of the model. The tree file is apparently too large to attach to this post (15MB). Thanks for your help!!!
See if this link works: https://drive.google.com/file/d/0B9WMaFDh7ps6Y2hPS2k2YVdHRDg/edit?usp=sharing
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@shueda said:
Ted,
I've exported VRMesh from 3DS Max, loaded the VRMessh into SketchUp, and used the Vray material editor to re-map or, as with your Oak leaves, import the materials. In addition, I've erased all of the VRMesh geometry and replaced it with a 2D always-face-camera image of the model. The tree file is apparently too large to attach to this post (15MB). Thanks for your help!!!
See if this link works: https://drive.google.com/file/d/0B9WMaFDh7ps6Y2hPS2k2YVdHRDg/edit?usp=sharing
As a side note, when ever you share files from Sketchup, save them first and then go to Plugins> V-Ray> Pack Scene. This will allocate all the associated files into one zip folder. As it stands, I cant test the file you sent. I don't have the material information, or the proxy. If you re-upload the file I can take a look at it again though.
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So, after some review I finally found the problem! In your materials diffuse bitmap there is an option to "Enable double-sided mode" by default its enabled because you can apply materials to both sides of a face in Sketchup (I had mine set up like this as well, oops). Go ahead and disable it for all your leaf textures, bump maps, and transparency maps. This should help speed up your renderings as well. Let me know how it goes!
Updated Model:
https://drive.google.com/a/usa.chaosgroup.com/file/d/0B_z-28sFcwxOS1hvNjViSjBxXzA/edit?usp=sharingUpdated Model w/2Sided
https://drive.google.com/a/usa.chaosgroup.com/file/d/0B_z-28sFcwxON0hTV0N1QlgzQzQ/edit?usp=sharingIll have them up for a couple weeks and then take them down to save space in my Google drive, so download them as soon as you can.
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OMG - you are a genius! Thank you!!!!!
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