LuxCoreRender Forums

Hey!

I wanted to render some kind of caustics and was curious about the dispersion of light too.
I wanted to know how I can achieve something like this in LuxCoreRender

https://blender.stackexchange.com/quest ... nder-prism
https://zeealpal.deviantart.com/art/Sim ... -263606354

The first link seems to use a older version because I see no Glass or Glass2.

Following this post, I just got some basic scene containing a sphere and a prism and some caustics, but no dispersion like in the links above
http://forums.luxcorerender.org/viewtopic.php?t=191

Hopefully someone can help me!


EDIT: It would be also good to know how I can achieve light shafts too.
Also I do not understand which kind of scences 'luxcoreui' supports or if there is a way to convert my blender scene.

Have you raised the "Dispersion" value of the glass node?
You will also have to use "Bidir" as engine and "Metropolis" as sampler to get noise free caustics in a reasonable time.

I tried what you said, but I can't achieve a result like this :/

https://i.stack.imgur.com/5vFCQ.jpg

It is really hard to guess what is going wrong without the .blend or at least a few screenshots of the scene and settings.
And obviously a rendered image would be good.

Chop91 wrote: ↑Mon Jun 18, 2018 5:28 pm Also I do not understand which kind of scences 'luxcoreui' supports or if there is a way to convert my blender scene.

luxcoreui is a tool for developers, not really intended for end-users.
LuxCore has a custom scene format. You can export to it from Blender with the "Only write LuxCore scene" checkbox in the LuxCore config panel.

Chop91 wrote: ↑Mon Jun 18, 2018 5:28 pm EDIT: It would be also good to know how I can achieve light shafts too.

Enclose your scene in a cube with null material, add an interior volume, replace the clear volume node with a homogeneous volume node.
You can adjust the strength with the scattering scale factor.
See the attached scene.

Thanks for your help!

I was just playing arround and basically tried to rebuild the scene from here:
https://blender.stackexchange.com/a/81040/57982

Maybe you can reproduce the rendered image from this post?

Here you go.

Thanks again!

Probably this works only with the laser?
I tried it with the sunlight before

It works with any light, but you need a tight beam of nearly parallel light rays for a result like in the image you linked.
If you want to use a sun light, you can do it like Newton and let the sun shine into a room through a tiny hole.
(and combine this with the lightshaft setup I posted above, so you see the light in the air)



But it is probably not the method with the highest rendering performance