Itoo Software Forum

Author Topic: Xfrog Plants Rendering Black in Mental Ray  (Read 1299 times)

Doug Gann

  • Newbie
  • *
  • Posts: 7
Xfrog Plants Rendering Black in Mental Ray
« on: March 20, 2017, 07:58:22 PM »

I'm trying to render a scene utilizing X-Frog plants, which render fine close to the camera, but turn black in the distance.  I'm using the same mental ray (v3.14.1.3) settings and lighting set up as the farmhouse road tutorial.  In the sample image attached, the palo verde trees look perfect close to the camera, but in the distance the trees should be just as bright green as the foreground.   This is happening on all my x-frog plants, I just dropped down to one species to try and isolate the problem. 

A second question on materials.  Right now the tree material consists of three standard materials grouped under the forest multi/sub materials.  When I switch the standard materials to Arch and Design, the net effect makes the plants render even darker.   If I should be using arch and design for the sub materials, how can I brighten up the trees?

Any help would be appreciated.  I'm using forest pro 5.20, Win 7 x64, 3ds Max 2017 Service pack 3 with 128 gb of ram and an Nvidea quadro with 4gb of ddr4 vram.

Doug Gann

Michal Karmazín

  • iToo Software
  • Hero Member
  • *****
  • Posts: 1838
Re: Xfrog Plants Rendering Black in Mental Ray
« Reply #1 on: March 21, 2017, 09:32:37 AM »
Hi Doug,

There is already a thread regarding this "dark trees" issue on our forum. We've added a RGB Level parameter to the Material Optimizer tool. Please feel free to check it for more details regarding this known problem (already reported to Xfrog Inc). As mentioned there:

"... we are not allowed to modify content of any third vegetation models and honestly we don't know which textures would require one or other value. In our tests some of their textures worked better with RGB Level set to 5, so might be even the value of 10 would work fine for some. Anyway, as far as we know Xfrog has done material changes on its models and most of them should be "V-Ray 3 ready" now. I would suggest you to get in contact directly Xfrog Inc by using this form."

Hope that helps.

Best regards,