Irradiance White Shadow

Thu Oct 27, 2022 5:56 pm

Having a bit of an issue when attempting to render out an irradiance pass, where this foilage in the planter is casting a white shadow? I've tried changing materials, separating/combining the mesh, and a few other things. Anyone ever see something like this? It's been perplexing me. Beauty and Irradance reference attached.

Thanks

Thu Oct 27, 2022 7:53 pm

currentstudios wrote:Having a bit of an issue when attempting to render out an irradiance pass, where this foilage in the planter is casting a white shadow? I've tried changing materials, separating/combining the mesh, and a few other things. Anyone ever see something like this? It's been perplexing me. Beauty and Irradance reference attached.

Thanks

Hi Currentstudios,

Thank you for the post!!

Would you please share the OFM and Maya versions or DM the scene for us to investigate?

cheers

Fri Oct 28, 2022 1:28 pm

I'm using
Octane 2021.1.5 - 20.19. I've tried both Maya 2020 and 2022.

I tried upgrading to the latest version of Octane, but for some reason it was changing the lighting for the whole scene (mostly environment light not creating shadows anymore). The lighting was client approved, so I had to move back to this version.

Apologies, I'm not sure what OFM stands for haha.

Fri Oct 28, 2022 1:53 pm

currentstudios wrote:I'm not sure what OFM stands for haha.

Octane for Maya

Fri Oct 28, 2022 2:02 pm

Oh thanks!

Further exploring, these artifacts are happening to any mesh in the scene that doesn't have backfaces. This is an environment meant for the web so there are lots of objects that have had un-seen back parts of them cutout to save UV space for lightmap bakes.

Still haven't figured out a great solution though.

Fri Oct 28, 2022 2:36 pm

By "doesn't have a backface", do you mean "flat meshes with no thickness" or were you referring to material backface?
Either way, both situations should be acceptable. Although I don't know when specifically using Irradiance mode.

Fri Oct 28, 2022 2:41 pm

Yes, I mean meshes with no thickness.

Fri Oct 28, 2022 3:29 pm

Anyone have any reccos?

Another example here, with these books having no faces on the back side, it almost looks like they're emitting light.... Was really hoping to create a light baking pipeline utilizing Octane but this is sorta killing that possibility.

Mon Oct 31, 2022 2:48 am

currentstudios wrote:Anyone have any reccos?

Another example here, with these books having no faces on the back side, it almost looks like they're emitting light.... Was really hoping to create a light baking pipeline utilizing Octane but this is sorta killing that possibility.

Hi currentstudios,

Thank you so much for the update.

Would you please run the latest stable build and see if it fixes it?
https://render.otoy.com/customerdownloa ... _20.21.exe

If not, is it possible to DM me a trimmed down Maya archive scene?
It would be much faster for us to investigate the scene setup!

cheers

Thu Nov 03, 2022 2:58 pm

Hey BK, gave that a shot, but unfortunately its still the same issue. I ended up going with a less than desirable solution which was to bake lighting maps from a blank white diffuse material. Its unfortunate as the light maps don't have the proper global illumination but oh well.

If anyone wants to look into it for the future, I was able to reproduce this by setting up a simple scene with a cube hovering above a plane, with the bottom face of the cube deleted, and then the daylight environment enabled with irradiance mode turned on.