Water Caustics

[Pitchi]

Hi !

Can we link a Maxon noise in the Texture channel of light to create fake water caustics with Redshift?

[Dr. Sassi]

Hi Pitchi,

Here is a quick example:

CV4_2024_drs_24_RScau_01.c4d

I placed longer numbers into the file (o.4545 instead of .4), so you can see quicker where things have changed.

Is this working for you?

All the best

[Pitchi]

Hi Thanks
I mean, it's possible to add a noise into a Light? in a light we can add a image or images sequences, but can we project a Maxon Noise directly?

[Dr. Sassi]

Thanks for clearing that, Pitchi.

Noise, while procedural and 3D, needs a surface to define the values. Light doesn't have it by default.

But it is easy to provide that, have a look:

CV4_2024_drs_24_RSca_11.c4d

(Of course, the "shadow wouldn't" be that sharp, as the water refracts it wildly. It is better to do it with more lights and, for the Noise, different seeds while scaling them up so the density stays the same.)

Is that better?

Cheers

[Pitchi]

Yes it's good ! i have done some test with also a transparent texture with noise on a plane but a sphere is good idea too

I have a big last question, i don't if it's possible. I have the light who project "caustics" on the ground BUT i want that the lighing is visible only under water or on a specific area. I create 2 versions, A and B to see what i want. It's possible to create a volume or area where all objects inside are lit and alls object outside are not?

caustics question.c4d

[Pitchi]

i think i found the solution, i use an instance of the floor, then up it with a Displacer and use a ramp mask the part above the water

caustics-question.c4d

[Dr. Sassi]

Hi Pitchi,

Thanks for the files.

If that works for your needs, great!

I explored it this morning, but the Ray Switch is not working inside a light setup, it might be helpful with texture/shader-based solutions

Using two light sources (Same settings) but working with the Project (Tab) Exclude /Include requires two models and might create more difficulties than help.

Let me know if there is anything else I can look into for this project.

My best wishes for the project

[Pitchi]

what I did works well, thank you very much for your time!

[Dr. Sassi]

… and it looks great, Pitchi!