Blender 2.79b
LuxCore 2.1 alpha0
CPU Path + Metropolis (also BiDir + Metropolis and Path/BiDir + Sobol)
Glossy Translucent Material with interior homogeneous volume
I can't see any difference, though every ball have different absorption depth
From left to right: 0.01 mm, 0.1 mm, 1 mm, 1 cm, 1 m, 10 m, 100 m
Homogeneous volume absorption depth
Forum rules
Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Re: Homogeneous volume absorption depth
The transmission color of the glossy translucent mat is black, so the volume does not make any difference because no light is transmitted.
Re: Homogeneous volume absorption depth
Do you have an example scene, which shows the difference in absorption depth? I still cannot figure out how absorption depth affects the material.
This scene has transmission color 7F7F7F at all balls.
CPU Bidir + Metropolis | Core i5-4570
Re: Homogeneous volume absorption depth
Yes, looks like it's something wrong in Blender.
PS.
It works fine in Material Preview, but not in Render Preview nor in Final render.
PS.
It works fine in Material Preview, but not in Render Preview nor in Final render.
Last edited by kintuX on Thu May 17, 2018 7:02 pm, edited 1 time in total.
Re: Homogeneous volume absorption depth
The absorption depth is the distance after which a white light ray (1, 1, 1) has the color that is specified as absorption color.
You can see the effect best with the null material.
Re: Homogeneous volume absorption depth
What about an example?
CPU Bidir + Metropolis | Core i5-4570
Re: Homogeneous volume absorption depth
OK. I get it. Volumes just don't really work with anything but Null material.
- Attachments
-
- machine-le-grass-test-ej.blend
- (4.23 MiB) Downloaded 264 times
CPU Bidir + Metropolis | Core i5-4570
Re: Homogeneous volume absorption depth
Volumes are independent from materials.
The material describes the surface, the volume describes everything inside or outside of the surface.
You might see something else than you expect because the material reflects too much light and transmits too little?
From left to right:
- Null
- Matte Translucent
- Glossy Translucent
- Glass
- Rough Glass
Hope this helps.
The material describes the surface, the volume describes everything inside or outside of the surface.
You might see something else than you expect because the material reflects too much light and transmits too little?
From left to right:
- Null
- Matte Translucent
- Glossy Translucent
- Glass
- Rough Glass
Hope this helps.
- Attachments
-
- volume_depth_example.blend
- (883.66 KiB) Downloaded 297 times
Re: Homogeneous volume absorption depth
You are confusing object transparency (or opacity if you prefer) with object surface+volume. Transparency makes all object (surface+volume) transparent, like with alpha channel. In your case must be set to 0, it is not what you are looking for.
The object material describes the surface (i.e. the "skin") of an object while volume describes the interior.