LuxCoreRender Forums

Thanks Dade and B.Y.O.B.,

Your kind and quick answers allowed me to understand deeper how LuxCore handles caustics.

Regards,
a proud luxcore user.

have you enabled light tracing ?

Yes I did.


I haven't looked into the scene (have you enabled light tracing ?) but from your description, I was assuming they were SDS paths.

In this test scene, the caustics on the mirror are SDS paths and are visible when using caustic cache:


Well I'm not ...

Thanks Dade for the quick answer.

However I didn't understand a thing:

If you have light tracing enabled (as you should), the cache is used only for for SDS paths (Specular-Diffuse-Specular paths, i.e. caustics seen trough specular objects), something not even BiDir+Metropolis can render.


If ...

Thanks B.Y.O.B. a lot.

While its much more clean, small circles still appear in image, at least compared to bidr+metropolis.
Will they disapear with more samples?

And why does it only happens when seeing through glass?


Again thanks a lot for support!

Hi everyone,

When using path+sobol and phontongi enabled, I get small circles instead of caustics. It only happens when viewed through glass (or water). If I put the camera behind water, caustics will render just fine. Also it works in bidr+metropolis.

I tried changing lookup radius, but I believe ...

Thanks a lot kintuX and B.Y.O.B., both of your solutions works pretty well.
This render engine deserves even more users!

Thanks everyone,

I tried your tips, but volumetric caustics are still barely visible. And if I increase the scattering, the scene becomes too bright.
I uploaded the scene if it helps.

Thanks a lot for your patience.

Thanks for your reply.

However i dont understand: why set up a volume in the camera?

And still, how can i make the volumetric caustics more evident? With possible "tricks" I mean, because mine are barely visible.

Thanks a lot for your support.

Hi, after all thanks to devs for this amazing render engine!

So my question is how to make a very basic scene with underwater volumetric caustics like in example scene "Underwater Paintings".

I've already downloaded the example scene, but I dont understand how a mesh without thickness can have a ...