[Fernando Tella]

Hi,

I think I found a bug. When trying to render a scene with a mxs reference which has a backface material applied, Maxwell crashes after voxelization.

I discovered while rendering from 3dsmax but it also happens from Maxwell Studio.

[Mihai]

Can you share a scene please? I can't confirm, rendering fine here.

[Fernando Tella]

Here it goes: https://mega.co.nz/#!k4VjzDAB!Fee_2SdrD ... Hmtzkm9Tac

It's a tree. Load it as mxs reference in any scene. Let's see if it works on your computer.

[numerobis]

I have the same problem. I thought it would be related to the sketchup plugin so i posted it here first: http://www.maxwellrender.com/forum/view ... 05&t=42175

Tree with backface material exported from Max as mxs and referenced in sketchup -> crash at "processing geometry" or "start rendering"
Not every time but maybe 3 out of 4 times i press the render button. Network rendering with maybe 10 nodes is nearly impossible because always half of the nodes is crashing.

(Win7 x64; Maxwell v3.0.1, SKP plugin v3.0.5, Max plugin v3.0.29)


edit: i have isolated the leaves now and could send you the files if you need it.

[Mihai]

Yes please, as simple as scene as possible helps tremendously when debugging. But I will test the two scenes you've sent also.

[Mihai]

Fernando, I'm missing ".......reflect_back" map in your scene so I can't render it.

I just saw that you are using SSS with thickness map, have you tried to see if you change that material, maybe without using a thickness map, without SSS etc. to try and narrow down the cause? It may be that it's not simply any material applied to the back face.

[Fernando Tella]

Updated the file: https://mega.co.nz/#!FsUFxDZJ!bNHHJlprh ... FCr3Dnft6A

[Mihai]

Thank you both for the files, it seems it has nothing to do with the complexity of the material which is a good sign. I replaced both mats with a simple red/blue diffuse mats, and it's still crashing or behaving strangely. I've forwarded the bug to the developers.

[Fernando Tella]

Thanks Mihai!

[numerobis]

Thanks Mihai!
I have noticed another thing when using backside materials with thinSSS. Instanced copies of the leaves look different to the original one (left tree first row) - a bit brighter and less saturated.

[numerobis]

I've forwarded the bug to the developers.

Any news about this issue? (and the second one with different colored mxs instances)
I'm preparing some new trees and i would like to use two sided materials.

[Mihai]

It should be fixed in the current early build available here www.maxwellrender.com/betas

Did you try it?

As for the second issue, it's difficult to tell from that render....Do you have the leaf material to share? Did you try just a very simple scene with one instanced plane and the leaf material on the real/instance one? I think it would be clearer to see what happens.

[numerobis]

I couldn't install the new build until now. I will do it at the weekend i think. I will test it then.
I will try it on a simple instanced plane as you suggested and i can send you the material too if you want to take a look. Thanks!

[numerobis]

Yes, it's working now. No crashes anymore so far! Thanks!
beta v3.0.1.3 (max 3.0.32 - btw. in max it shows "Engine version: 3.0.1.2" )

And this new build seems to be ~6% faster than v3.0.1 at this scene!?! Very nice!

Is this due to an improved alpha map rendering or something else?