Darkness in transparent surface ?

Use this forum for general user support and related questions.
Forum rules
Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Posts: 49
Joined: Wed Jan 10, 2018 12:25 pm

Re: Darkness in transparent surface ?

Post by zeealpal » Wed Oct 07, 2020 2:18 pm

Not sure if you've tried already, but does the caustic cache yield any decent results? If the camera is the only thing moving, then it wouldn't need to be recalculated between frames.

Posts: 67
Joined: Sat Mar 28, 2020 10:36 am

Re: Darkness in transparent surface ?

Post by zooropa » Thu Oct 08, 2020 7:32 am

Yes the table is still and I am moving the camera for different frames. I need to explore that feature, I am new with lux.

User avatar
Posts: 1010
Joined: Sun Jul 01, 2018 12:07 pm
Location: Switzerland

Re: Darkness in transparent surface ?

Post by FarbigeWelt » Thu Oct 08, 2020 9:14 am

CodeHD wrote:
Wed Oct 07, 2020 12:36 pm

You image looks like like you are looking pretty diagonally, so a number around 100 doesn't seem unrealistic.
Very well explained, CodeHD. Your sketch and words help much to understand why rendered glass seems looking wrong or vice a versa we often do not perfectly know how glasses / transparent material look in reality.

I like to add what I learned about glasses in LuxCoreRender over the past months.
->) If you need material Glass colored clearly you must define an internal Volume Clear and define its Absorption Color and Depth (the depth at which the volume gets its defined absorption color).
->) Usually, I define colors with saturation ~0.9 and value 1.0. Then I define depth depending on object’s depth (metric size).
For slightly colored objects I define absorption depth e.g. 25 times of object‘s depth,
for dark colored e.g. 1/10 or less.

Have all much fun with splendid LuxCoreRender!
Light and Word designing Creator - www.farbigewelt.ch - aka quantenkristall || #luxcorerender
Windows 10 Pro 64 || 2x16 Cores, AMD Ryzen 3950X @3.5GHz, 64 GB RAM, DDR4 @3.2 GHz
2x openCL, AMD Radeon RX 5700 XT, 8 GB VRAM || Gfp = SFFT Gflops

Post Reply