LuxCoreRender Forums

lighting_freak wrote: Mon Jul 20, 2020 3:44 pm Might be the right time to introduce kind of brdf node that allows to define the portion of scattering types (matte, glossy, specular) per incidence angle. Ideally with some optional interpolation types (e.g. linear, exponential etc) between those points.

Hi,

Might be the right time to introduce kind of brdf node that allows to define the portion of scattering types (matte, glossy, specular) per incidence angle. Ideally with some optional interpolation types (e.g. linear, exponential etc) between those points.

What do you think?

BR

Hi all,

From measurements I know the exact transmission of some different coloured clear materials. Due to having this measurement with different thicknesses I'm able to calculate the absorption coefficient.

In old luxrender it was possible to transfer this absorption coefficient to the render ...

Hi,

But if you select a static color instead of IOR the angular dependency is lost, isn't it?

BR

Hi all,

I think the "glossy" material node has an option called "IOR". If one select this the amount of reflection is calculated by Fresnel law.

The Fresnel law makes a reflection more bright with more plain observation angle.

Additionally the roughness parameter could be used to scatter this ...

Hi,

lacilaci wrote: Thu Jul 02, 2020 12:22 pm Not sure what's the problem, just switch to gpu and enable lighttracing.

From now on you're my personal hero. A test scene runs much quicker than before and reaches the good result in a time that I could get little animations with a single weekend of rendering.

Thank you very much.

BR

Hi,

with complicated light paths I meant something like that:

Lichtleiter_neu.jpg

I've added the blend-file to that post.
If you'd like you could try to find a solution to reach this result without biDir.
It would be really helpful for me to find something to speed those kind of visualisations ...

Hello,

lacilaci wrote: Thu Jun 25, 2020 10:50 am Don't get me wrong.. I don't care about bidir

BiDir is still the only engine that seems to be able to manage complicated light paths...

Bidir isn't often used so it is not a lost

I guess is often used by people that care about the physics based realism.

Hi,

Thanks for your help.
This one is a good question too.
I had some troubles in the past as well:

Fox wrote: Thu Jun 25, 2020 11:56 am Are there any other FP32 limitations for volume absorption in small scale rendering, like jewelry?

BR

Hi,

I would be interested in such a tool as well.

Could you please be a little more specific how you might get some [cd] values from luxcorerender?

BR