How to get caustics working in C4D ?

[Bolos]

Hello !

I am new to Octane for C4D and so far everything's going fine, but I'm unable to get caustics, can someone tell me the basics steps to get some ?

Thanks a lot !

[FooZe]

The most important thing is to use the Path Tracing or PMC kernel.
PMC is generally the best for complex caustics. Another important setting is the caustic_blur setting. The default of 0.01 is generally good, high values will make the caustics more visible and show faster, but will be less detailed (blurred!). Lower settings (or off) will lead to longer times to get noise free caustics, but they should be more detailed.

In the PMC kernel, lowering the Parallelism helps rays to "find" detailed caustics, but it will lower the speed of the render. Lower this if you have some serious brute force capable hardware (like 4 titans) and you want ever bit of caustic detail and you don't mind waiting for it.
Otherwise the default setting of 4 is good.

Thanks
Chris.

[Bolos]

Thanks for your answer FooZe, but even with your tips I can't get any caustics to appear.

I tried both PMC and Path Tracing in 5min renders and I didn't saw anything showing up in my glasses shadows.

I have a brand-new GTX 770, so I think it's okay for me on the hardware side.

Could you send me an example file ?

[FooZe]

What kind of lighting are you using?
Uniform lighting (like the texture environment with the default uniform value) won't really work.
Make sure to use a powerful emitter or the sun environment.

Thanks
Chris

[Bolos]

I'm using a sun and area lights, very confusing.

Here is the kind of setup I use so far, if someone is kind enough to look at it and tell me what I need to do in order to get some caustics, I'd be glad !

http://www.mediafire.com/download/5vvvb ... /X014b.c4d

[aoktar]

i haven't time but you can check the sample scenes for a few simple scene

[Bolos]

From this pack ?

http://www.rainasawrus.com/products-fre ... nder-pack/

Nice work and very useful to learn Octane faster, but I can't seem to find a scene with caustics.

Thank you anyway !

[aoktar]

1.0 rc link page has everything on this forum. Thanks

[Bolos]

Okay sorry, I didn't noticed this link when I looked at this topic.

So I had a look at the caustic3 scene from the files but I didn't managed to adapt the settings to my file.

I also noticed that this scene is scaled really small, has it an impact on the caustics ?

[aoktar]

possible, octane can give realistic results with correct world scale. If diameter of your ring is 1 cm. then you should set as it