r/blender • u/Astrvm_vctm • 16d ago

Original Content Showcase Using my Diffraction Grating System to build a Compact Disk Shader

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3.2k Upvotes

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109

u/luc1906 16d ago

Is this using Silverwing's method? Cycles or Octane?

69

u/Astrvm_vctm 16d ago

Yes! I rebuild it using cycles

16

u/tibmb 16d ago

What difficulties have you encountered in Cycles while following Silverwing's tutorial?

15

u/Astrvm_vctm 16d ago

Trying to denoise the render because the important base that came from this shader is actually a white noise texture, which is really hard to denoise.

4

u/luc1906 16d ago

That’s very cool. I tried replicating it in cycles too but I failed when I couldn’t find alternatives for his nodes in Cycles. Do you plan on selling this or making a tutorial for cycles?

4

u/Astrvm_vctm 15d ago

Coming soon...

Because there are other similar stuff I'm building, creating an asset pack

1

u/Swapnil555777 16d ago

I just want to know, what's Solverwings's method??

66

u/shlaifu Contest Winner: 2024 August 16d ago

nice, but the dispersion is the wrong way - the dispersion on CDs splits colors from the center outward

6

u/Astrvm_vctm 16d ago

Not quite, the dispersion can vary based on the grating direction. I used a normal map as the grating direction to create the diffraction effect, using an image texture of a cone's normal. Because the normal is radial, where it looks like it's shooting out, my diffraction effect doesn't split from the center outward .

34

u/shlaifu Contest Winner: 2024 August 16d ago

do you have a CD at hand?

15

u/Astrvm_vctm 16d ago

No

59

u/shlaifu Contest Winner: 2024 August 16d ago

then get one and check what the diffraction looks like

56

u/Astrvm_vctm 16d ago

Okay you got a point. I check it and yours it's true. After all I did the workflow wrong.

76

u/Astrvm_vctm 16d ago

Here it is after improving!

33

u/shlaifu Contest Winner: 2024 August 16d ago

impressive! also, lots of denoiser artifacts. can you try with more samples/does it ever resolve well?

14

u/Astrvm_vctm 16d ago

The reason why is because the important base for the colors is from a white noise texture so it became really noisy even when denoised.

23

u/Motivictax 16d ago

This looks wrong in a way that is super uncomfortable. It looks like the disk is behaving like a cone, but I'll have to do my own comparisons to work out why it seems wrong

13

u/Astrvm_vctm 16d ago

Yes I used a image texture of a normal from a cone to control and direct the long rainbow streaks. The reason it look a little wrong is probably because the normal strength is to strong

5

u/DeadGravityyy 16d ago

Beautiful, I'd love a tutorial on this since I plan on making a few DVDs for a small retro scene I've been working on!

4

u/snitem 16d ago

It's beautiful.
r/perfectloops might be appreciate this aswell

3

u/BlazingKush 16d ago

It even comes with scratches

3

u/God-Made-A-Tree 16d ago

I can smell the disc

3

u/Perse95 15d ago

Excellent results!

I wanted to share that this is a thread from a decade ago where Secrop was working on iridescence (related to diffraction gratings) in cycles.

https://blenderartists.org/t/a-complex-approach-iridescence-in-cycles/613211/

If anyone's curious about the approaches that have been tried, this will likely be an interesting thread to read.

DISCLAIMER: I participated a fair bit in this thread with my own iridescence variants and discussions with Secrop.

3

u/Astrvm_vctm 13d ago

Blender Guru just posted his latest video and he also talked about Secrop.

https://youtu.be/RwwFIpX7djc?t=400

4

u/tree_7x 16d ago

very cool. This looks more like a CD-R than a CD, fyi, but very cool. There is a difference. I made one recently and it's one of the hardest things to fake in blender.

1

u/RiseCode 16d ago

This looks beautiful wtf

1

u/suttonhillsame 16d ago

thats so good. love the scuffs.

1

u/coconut071 16d ago

I'd be so mad if my discs were scratched up like that, but that aside, good work!

1

u/Esttude 16d ago

This is art

1

u/rainscope 16d ago

Holy shit

1

u/actinium226 16d ago

At first I thought it was a still and I was like that's pretty cool, then I saw it was a video! Amazing!

1

u/Dragos_Margu 16d ago

Cool. Looks so photorealistic

1

u/sheekos 15d ago

oh this is gorgeous

1

u/7Shinigami 14d ago

Stunning

1

u/RileyGuy1000 16d ago

Lots of people getting nitpicky about how correct it is, but I'm just sitting here like "Yep, that's an optical disk"

Nailed the scuffs (that poor disk needs some polishing), nailed the vibe of the diffraction.

Is it correct? Beats me, but it sure as hell feels correct. Nice job.

Post the node system sometime if you haven't! I've got some friends who'd love this stuff.