0:34 Caustics are produced by curved reflective or refractive surfaces, where all the energy of a light beam of nonzero area gets focused down to a line or a point (close to zero area). A lens, for example. You know how you can focus sunlight to a point with a lens and make a spot so hot it burns? That’s why it’s called “caustic”.

oh my goodness........ i watched this and literally every video on blender caustics that i could find, and just couldn't get it to work. Until i looked at the light settings in cycles instead of eevee. got it. good stuff btw!!!

Thank you for such a well explained tutorial about caustics.. I've been searching for something like this for a while.

Sir your channel is really underrated. Thanks. Best video about caustics!

Awesome explanation! I've seen other videos before about Blender's clamping system, but this is the first time that it actually clicked with me. The comparison pictures really help. Thanks!

keep up the good work sir. they're gonna come.

Great video! Very much appreciated!

after hours one day thanks to your wonderful video i was able to activate them thank you now i can complete my biggest project

wow dude, love finding small channels like this! Great tutorial, thank you!

@Jonah_Anthony

2 жыл бұрын

also is your mac running the new m1 chip? I can't believe how fast these previews are

@christopher3d475

2 жыл бұрын

I'm running both an i9 laptop with AMD GPU and an M1 Mini. I'm hoping to upgrade to an M1 Pro or M1 Max soon.

Great explanation. Tanks for your beatiful tutorials.

@christopher3d475

2 жыл бұрын

You're very welcome. I'm working on a new one right now.

thnx amazing video man. i try them before looking to this video ^^ . thnx dude.

Hey thank you for this. Please make a similar in depth video on subsurface scattering, bump and displacement as well. It will help a lot. Thanks again for this

@christopher3d475

2 жыл бұрын

I'll sure look at doing those, thanks for the suggestions.

Extremely helpful. THANK YOU. Although Blender keeps crashing.

@vit.c.195

2 жыл бұрын

Keeps crashing? Maybe you still using Windows?

@KennyPhases

2 жыл бұрын

@@vit.c.195 I am, i just cant use GPU, but my friend says it's possible to use the GPU! Ugh so frustrating how long these render times are!

@xanzuls

Жыл бұрын

@@vit.c.195 Most people who use Blender use windows

@vit.c.195

Жыл бұрын

@@xanzuls Not my problem... on LInux it's works rapidly fast stable and with full support RTX or even Readeon.

What a spectacularly useful video. I've been looking into other renderers to achieve this while cycles could do it natively all along, lol. :D I have a question: If i make a dispersion shader -say a prism - will the colourful light also affect the caustics?

@christopher3d475

2 жыл бұрын

I certainly wish Blender had a more sophisticated sampling system that made caustics more feasible, but at least for some things like my diamond rings, it works well enough. I'll have to check into the prism.

@northwind6199

2 жыл бұрын

@@christopher3d475 Thank you, appreciate it! :D

Blender on Mac still has gpu support on Mx with the silicon version

I don't know if I've missed something, can't it be done only in shadows? How is it possible for a metal to emit caustics in Blander? Edit: in the video you explain all 🤓

i do not see shadow caustics in light properties. tested in blender 3.2 and 3.3. i'm on windows and tried both cpu and gpu mode. any idea?

I have a gem and i cant get it to cast caustics unless i use the smooth shading option but when i do it smooths all my facets and makes the gem look like jelo, clearly there is a way to have objects with sharp edges cast caustics i just dont know what it is.

@christopher3d475

Жыл бұрын

When you enable Smooth shading, try setting the shading angle to zero.

What happens if I have both on? the approximate caustics AND the true caustics? Does it work with actual volumes, or just the "fake" ones like the glass shader?

@christopher3d475

2 жыл бұрын

they're independent mechanisms and should work together.

I don't know what I did ưởng but my caustic only shows in the preview and not on render even with this tutorial

Thanks😁 Maybe you can do something about same topic in EEvee?

@christopher3d475

2 жыл бұрын

You know I haven't really explored Eevee, my interests have primarily been with full raytracers.

Is it possible for you to upload a downloadable .blend file for this? Not sure if it's me or the program itself not working but I followed the video and I still can't get it to work.

After 10 minutes of rendering… Mac user using cpu rendering: “How do we reduce noise?!!!” Me and my 4090 using Optix GPU rendering with 16000 samples: “What are you talking about? Where’s the noise?”

Holy smokes! Is this the Chris Tyler that taught all the strata 3D stuff?!?

@christopher3d475

2 жыл бұрын

It is, yes.

@essentialelephant8850

2 жыл бұрын

@@christopher3d475 WOW!! I used to watch ALL of your Strata videos, they were gold!! But of course I then found Blender. Please tell me your are on Twitter?!?! Amazing to see you here, I hope you are focusing on Blender, we need you!!

I am in blender 3.2 and it isnt work for me=/

Sound like a job for viewlayer to reduce the samples

I just download blender 3.2 but caustics option it doesn't show in lights property !

@christopher3d475

2 жыл бұрын

Are you using it in GPU mode on the Mac? It only works in CPU mode in Cycles on the Mac.

@lisarauch2339

Жыл бұрын

@@christopher3d475 THANK YOU SO MUCH, I searched so long to find this solution!!!

Thank you for this video! I followed it, but I'm still not getting any caustics. I have a goblet object and when I click to enable caustics, the shadows are still flat. Cycles is enabled and caustics is enabled for the glass and the floor. I'm in a new install of 3.2, this is the first thing I've done, so I'm in default settings. Any guesses. anyone? Thanks! UPDATE: I didn't have Shade Smooth enable for the glass. Shade Smooth has to be enabled. It works now!

@christopher3d475

2 жыл бұрын

Is this for shadow caustics or the tradition raytraced form?

@melbendigo

2 жыл бұрын

@@christopher3d475 For shadow caustics.

@christopher3d475

2 жыл бұрын

@@melbendigo They only work in CPU mode, if you switch to GPU, those options become hidden.

@melbendigo

2 жыл бұрын

@@christopher3d475 Thank you, Chistopher. I'm in CPU mode and have the options, but no visible caustics.

6:32 No curvature, no focusing, so no actual caustics.

i followed all the setps, but the caustics dont show up

@christopher3d475

2 жыл бұрын

Shadow caustics? Are you in GPU mode?

@G1NJO

2 жыл бұрын

@@christopher3d475 yes sir

@G1NJO

2 жыл бұрын

@@christopher3d475 i downloaded the offical 3.2 version

@G1NJO

2 жыл бұрын

well now it works with a glass obj. but it doesnt work for default cube with glass shader

@christopher3d475

2 жыл бұрын

@@G1NJO At least on the Mac, it doesn't work in GPU mode.

Last I checked Caustic only works in cycles.

@christopher3d475

2 жыл бұрын

Yes, it's something that properly requires full raytracing.

Idk why I can’t understand this. Am I dumb or something?

0:19 your accent stones have flipped normals

@SmellsMonochrome

Жыл бұрын

If this was modelled in Rhino or a plugin for it, it has an issue with flipping normals on mirrored block instances.

@christopher3d475

Жыл бұрын

Yes, I realized and fixed that after I had done the renderings.

The caustic are not realistic enough because its not colored

@christopher3d475

Жыл бұрын

They are in 3.4. Watch my video on Path Guiding.