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Author Topic: Vray RT not able to render Forest Color  (Read 1444 times)

SR1351

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Vray RT not able to render Forest Color
« on: December 05, 2015, 05:25:55 AM »
I am using forest color map to render a certain texture onto one of your preset grass. Unfortunately it doesn't work right, it doesn't render the texture on the grass, if I switch to vray ADV it renders just fine.  I need this for a production render, any solutions?

Thanks

iToo

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Re: Vray RT not able to render Forest Color
« Reply #1 on: December 05, 2015, 08:27:46 AM »
No, sorry. I'm afraid that Tint options and Forest Color is not supported in V-Ray RT.  You can a list of supported features by each renderer here.
Carlos Quintero
iToo Software

SR1351

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Re: Vray RT not able to render Forest Color
« Reply #2 on: December 05, 2015, 09:10:32 AM »
I need to be able to texture the preset grass with the same texture being applied to the ground surface, is there anyway to do that without forestcolor shader?

Paul Roberts

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Re: Vray RT not able to render Forest Color
« Reply #3 on: December 07, 2015, 03:08:38 PM »
Hi,

The only way I can see to do this at the moment that works with V-Ray RT is to use Planar from World XYZ mapping coordinate system. I prefer to use real world map size and then in that way you can easily position the texture using the bitmap map's Size and Offset parameters.



To see the results in the viewports you will probably need to turn on Display Realistic materials with Maps but to help get an approximate position I also find the the Surface's X position minus half its X size gives me a good starting point for the Width > Offset value, and a Y Position minus half the surfaces's Y Size works for the Height > Offset.

I hope that helps.

Many thanks!

Paul

Paul Roberts
iToo Software

SR1351

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Re: Vray RT not able to render Forest Color
« Reply #4 on: December 07, 2015, 08:51:27 PM »
Thank you, I'm going to give this a try.

SR1351

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Re: Vray RT not able to render Forest Color
« Reply #5 on: December 08, 2015, 09:21:51 AM »
Okay maybe I should of been more clear, sorry. I'm running RT GPU. I can get it to work with RT CPU, but how to get it to work for GPU?

Paul Roberts

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Re: Vray RT not able to render Forest Color
« Reply #6 on: December 08, 2015, 10:49:04 AM »
My apologies, I thought I had checked on the GPU but I had a configuration error and RT was silently falling back to the CPU. You're right, this doesn't work on GPU and I can't think of another workaround at the moment.  In this case it's probably worth bringing this up on the Chaos Group forums because unfortunately these limitations are related to RT and are out of our control.

Meanwhile if I can think of an alternative workaround I'll post it here.

Thanks,

Paul
« Last Edit: December 08, 2015, 11:15:41 AM by Paul Roberts »
Paul Roberts
iToo Software

allemyr

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Re: Vray RT not able to render Forest Color
« Reply #7 on: December 18, 2015, 07:20:38 PM »
Hi,

It would be super cool to be able to use Forest Color within Vray RT GPU. I understand that it's much work to be done to be able to accomplish this.

Vlado from Chaosgroup says something like this on the Vray forum about Forest Color and Vray RT GPU "It is not impossible, but we will need help from Itoo to implement it and I don't know if they are interested. It doesn't hurt to ask, I guess."

I understand that having Vray CPU and GPU render is like having a second render engine from the same company to make a plugin for = much more work. But I think Vray GPU is the future  :D It would be super cool!

Thank you very much for a awesome product, I really like how well Vray RT GPU and Forest Pack works togehter rigth now anyways, but with Forest Color, the realism on trees would be sweet!

iToo

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Re: Vray RT not able to render Forest Color
« Reply #8 on: December 21, 2015, 09:14:49 AM »
Hi, yes, we have this feature in our wishlist since some time ago. We'll check what can be done, but unfortunately it involves several technical issues:

1) Forest Color uses large data structures which are stored in Forest, as the hierarchy of elements in the mesh (these are created for each tree model).
Since the GPU cannot access directly to the Forest memory, we should provide to ChaosGroup some way to copy all these data to the GPU RAM.

2) The binary code of Forest Color cannot run in GPU (it's compiled for CPU), and we cannot write a GPU shader because V-Ray RT doesn't allow that (there is not a SDK). So, we should simplify the source code (it's a bit complex) and give to it ChaosGroup so they compile and integrate it within of V-Ray. This is a complex and completely new workflow for us.

I'm sorry by the technical terms, by i wanted to provide a detailed explanation of why this feature has not been implemented yet. :)

Thanks,
Carlos Quintero
iToo Software

allemyr

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Re: Vray RT not able to render Forest Color
« Reply #9 on: September 16, 2016, 03:20:37 PM »
Hi! First of, thank you for a great event in Göteborg, Sweden earlier today! Simply great! :D

I'am trying to follow along the steps above but think some steps is left out, I can offset the maps and so on the right way. But what's after that to get a item forest color effect.

I'am a Vray RT GPU user. Have searched a bit and can't find a nice thread about this planar xyz workflow here or on ChaosGroup forum.

Would be super cool. Again thanks for a great event, really nice!

Best

Karl Allemyr, Sweden

Paul Roberts

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Re: Vray RT not able to render Forest Color
« Reply #10 on: September 16, 2016, 06:21:27 PM »
Hi Karl,

Thanks so much for the kind words, I'm glad you enjoyed the event! :)

You're right, there was an issue with V-Ray RT GPU where using Planar from World space feature doesn't work. Originally I had only tested this on V-Ray RT CPU. However since this was posted I understood the issue has been fixed, but only recently in V-Ray 3.4.01. You can see it mentioned in the release notes here.

https://docs.chaosgroup.com/display/VRAY3MAX/3.40.01

If you're already using this version and it is still causing problems, please let me know and I'll investigate further.

Thanks again!

Paul
Paul Roberts
iToo Software

allemyr

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Re: Vray RT not able to render Forest Color
« Reply #11 on: September 17, 2016, 08:20:24 AM »
The problem for me is that I really don't now how to apply the texture. For now I just put the texture in a composite map and blend the diffuse channel a bit but I think that's the wrong way to do it.
If there is a short guide for using the planar XYZ workflow it would be helpful.

Is there still no SDK for Vray GPU? I understand that it is a big difference in programming between CPU and GPU rendering but I don't know so much about it unfourtunately. I really like GPU rendering though and there is mostly ways around things.

Attached a closeup of the rendering I was doing yesterday. I think I have to work more on the leaf shader anyways.

allemyr

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Re: Vray RT not able to render Forest Color
« Reply #12 on: November 13, 2016, 10:37:25 AM »
Hi again :)

Any news on forest color for Vray GPU?

Michal Karmazín

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Re: Vray RT not able to render Forest Color
« Reply #13 on: November 14, 2016, 11:47:00 AM »
Hi,

As fas as we know, the Chaos Group team is now working on it (thought its implementation isn't confirmed yet).

Let me mention, that's actually possible to replace the Forest Color map by the VRayMultiSubTex to get similar results (attaching screen-shots). Hope you'll find it useful.

Best regards,