LuxCoreRender Forums

Well, I did.

lighting_freak wrote: Thu May 28, 2020 2:42 pm Almost one year ago I had almost same troubles but with BiDir and Metropolis:

viewtopic.php?f=4&t=1198&p=14635#p14635

Shall we move the dicussion in that thread?

Hi,

another half a year is gone and with animations the "flicker" issue remains.
Some frames seem to become brighter than any others. I'm working with Metropolis and BiDir.

Thank you for your response.

BR

Hello all,


You would certainly have to play with the anisotropy of the volume scattering to get this effect.


I don't believe that we have to use anisotrophy settings. The material is a molding compound, no directional dependency is expected if you do some real parts from it.


the thickness ...

HI,

sure I can try to describe the meaning:
Let's start with "8N" - it is the clear basic PMMA material.
The "DF_XX" is the density of light diffusing elements within this basic acrylic. The higher this number the more diffuse the volume is.

There are some images that show some key facts to the ...

Hi,

I'm quoting myself:

Can the above issue be fixed?


Please fix this bug that the created light output fits to real world data.
One more question to light sources:
If one use a 90° spread angle - the surface will emit light like a perfect lambertian emitter? It follows the Cosine-Law?
If the ...

Hello all,

finally the sample part that should use the DF23 material. I hope the download-link works:
https://www.dropbox.com/t/4OvpV1lyUnVKTr5R
Material definiton in that sample is different, compared to the one that we made during the last days.

I continue the investigations on the material ...

Hello all,


Is there another shader model that would be worth integrating into LuxCore?


Yes, there should be an open BRDF/BTDF/BSDF format, that allows users to define the light interaction precisly per incidence angle...

I mean something like a theta/phi look up table. Maybe we could use IES ...

Hi,

thanks for your answers.


That is not a property of the scattering volume, but of the surface!


On this pictures you may see that the sample plate is almost specular:
20201124_095059.jpg
20201124_094949.jpg

Anyway I ran tests with different surface settings (rough, matte translucent ...

Hello all,

I'm still working on the example file... but the topic remains in my mind and also on my desk.

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 ...

Hello,

Dade wrote: Fri Nov 13, 2020 4:39 pm You can't with FP32, etc.

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.

Thanks for your explanation.

BR