Search found 434 matches

by CodeHD
Tue Nov 24, 2020 10:08 am
Forum: User Support
Topic: strange behaviour of homogeneous scattering volume
Replies: 17
Views: 8217

Re: strange behaviour of homogeneous scattering volume

On this pictures you may see that the sample plate is almost specular: Exactly: almost ;) Your choice of normal map seems to be quite a good match. Attached is your scene back with three changes: Clear Volume instead of Homogeneous. (The effect really comes form the surface alone. You can add some ...
by CodeHD
Mon Nov 23, 2020 4:20 pm
Forum: User Support
Topic: strange behaviour of homogeneous scattering volume
Replies: 17
Views: 8217

Re: strange behaviour of homogeneous scattering volume

I've continued the investigation of the scatter volume and all the tests I've done share also one irregularity. The render results doesn't look blurry. It always appears like there's a colour fade out only with the growth in material thickness: This is a photo of the material that is like imitate: ...
by CodeHD
Mon Nov 23, 2020 4:18 pm
Forum: Development
Topic: Disney BRDF material
Replies: 122
Views: 71143

Re: Disney BRDF material

Yes, given how much I already started reading into this topic I can try to do it. The Moana-article you linked seems to describe 2015 as well, so there is example code. It also already provided me with some explanation for questions I had from the current LuxCore implementation. I have briefly looke...
by CodeHD
Sun Nov 22, 2020 9:54 pm
Forum: Development
Topic: Disney BRDF material
Replies: 122
Views: 71143

Re: Disney BRDF material

Thanks for the quick response Dade! The wonderful world scientific papers, 90% is just ru**ish, the other 9% may be interesting but they don't provide even half of the required information, the 1% is done right. Providing sample code should be the bare minimum requirement to publish a paper. Strictl...
by CodeHD
Sun Nov 22, 2020 8:52 pm
Forum: Development
Topic: Disney BRDF material
Replies: 122
Views: 71143

Re: Disney BRDF material

I'm also checking a bit the code because some of the outputs doesn't look right to me. I'm digging out some old stuff here, but I'd like to ask if you remember what these outputs were back then that you investigated? Was it just the things discussed in this thread like front-backside or the specula...
by CodeHD
Sun Nov 22, 2020 7:43 pm
Forum: User Support
Topic: Specular reflection vs diffuse reflection.
Replies: 24
Views: 15672

Re: Specular reflection vs diffuse reflection.

Could you perhaps clarify what your ultimate goal is? Both w.r.t. this thread as well as your test setup in general. Upon re-reading your first post, it sounds like you ware aware of this problem first, and now built it specifically to experimentally verify it. Is that correct or was it built for an...
by CodeHD
Sat Nov 21, 2020 6:44 pm
Forum: User Support
Topic: Specular reflection vs diffuse reflection.
Replies: 24
Views: 15672

Re: Specular reflection vs diffuse reflection.

But aside from Disney model there is also the Glossy2/Matte material from Lux being tested. I could make the same argument here. Glossy2 has some underlying model. Do you have a reason to believe that it should fit your material? How does it actually compare for matte? I don't think you have explic...
by CodeHD
Sat Nov 21, 2020 3:47 pm
Forum: User Support
Topic: Specular reflection vs diffuse reflection.
Replies: 24
Views: 15672

Re: Specular reflection vs diffuse reflection.

I'm currently working my way through the (2012) Disney paper , trying to understand it better. You seem to be working with the assumption that this shader is a perfect physical model for all real materials. You can't make this assumption! Here is a quote from the Disney paper: In developing our new ...
by CodeHD
Wed Nov 18, 2020 1:34 pm
Forum: Development
Topic: exr image output
Replies: 24
Views: 12198

Re: exr image output

Hi bartek_zgo, There is one difference between your code and the one Dade posted. Try to remove these two lines from your code: film.imagepipelines.0.3.type = "GAMMA_CORRECTION" film.imagepipelines.0.3.value = "1.0" I've just had a little stroll through the source code. While tec...
by CodeHD
Mon Nov 16, 2020 12:12 pm
Forum: User Support
Topic: strange behaviour of homogeneous scattering volume
Replies: 17
Views: 8217

Re: strange behaviour of homogeneous scattering volume

You mean it's impossible or it will just last long? I'm not looking quick results but for high realism. Is FP32 floating point precision? I don't get the connection between the precision and this surface/volume issue. In this case, it could be helpful to show a sketch of the full setup you eventual...