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Fix #119797: Noise Texture Precision Issues #119884

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Brecht Van Lommel merged 5 commits from Hoshinova/blender:fix-119797 into main 2024-03-29 16:12:34 +01:00
Conversation 10 Commits 5 Files Changed 8 +154 -60
Hoshinova commented 2024-03-25 17:23:13 +01:00
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The Perlin noise algorithms suffer from precision issues when a coordinate is greater than about 250000.

To fix this the Perlin noise texture is repeated every 100000 on each axis.
This causes discontinuities every 100000, however at such scales this usually shouldn't be noticeable.

The Perlin noise algorithms suffer from precision issues when a coordinate is greater than about 250000. To fix this the Perlin noise texture is repeated every 100000 on each axis. This causes discontinuities every 100000, however at such scales this usually shouldn't be noticeable.
Hoshinova added 1 commit 2024-03-25 17:23:22 +01:00
Iliya Katushenock added this to the Render & Cycles project 2024-03-25 17:24:12 +01:00
Hoshinova added 1 commit 2024-03-25 17:24:55 +01:00
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8cc7115281 -- Fix typo.
Hoshinova requested review from Brecht Van Lommel 2024-03-25 17:25:24 +01:00
Hoshinova requested review from Omar Emara 2024-03-25 17:25:25 +01:00
Thomas Dinges commented 2024-03-25 17:26:14 +01:00
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@blender-bot package

@blender-bot package
Blender Bot commented 2024-03-25 17:26:17 +01:00
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Package build started. Download here when ready.

Package build started. [Download here](https://builder.blender.org/download/patch/PR119884) when ready.
Omar Emara commented 2024-03-26 07:47:33 +01:00
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Was the isinf there to fix this same issue?

Was the `isinf` there to fix this same issue?
Hoshinova commented 2024-03-26 13:01:05 +01:00
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Was the isinf there to fix this same issue?

Maybe, or maybe not. It was added by Brecht in 8cf374d401 (diff-c348bd67a7f307556517475894a207949ee5b853)

But either way I don't think it's a good idea to have it there.
If the output is inf in some cases then that's a bug to be fixed. isinf "hides" it by outputting a default value, which doesn't really solve the problem.

> Was the `isinf` there to fix this same issue? Maybe, or maybe not. It was added by Brecht in https://projects.blender.org/blender/blender/commit/8cf374d4012e193a50a58f1e2abcdae306ae33cd#diff-c348bd67a7f307556517475894a207949ee5b853 But either way I don't think it's a good idea to have it there. If the output is `inf` in some cases then that's a bug to be fixed. `isinf` "hides" it by outputting a default value, which doesn't really solve the problem.
Omar Emara requested changes 2024-03-27 09:25:38 +01:00
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The noise is still continuous even after this change I think, though not differentiable. So maybe clarify the comment as well.

The noise is still continuous even after this change I think, though not differentiable. So maybe clarify the comment as well.
intern/cycles/kernel/osl/shaders/node_noise.h
@ -35,0 +32,4 @@
/* Repeat Perlin noise texture every 100000.0 on each axis to prevent floating point
* representation issues. This causes discontinuities every 100000.0, however at such scales this
* usually shouldn't be noticeable. */
vector3 p = vector3(fmod(co.x, 100000.0), fmod(co.y, 100000.0), fmod(co.z, 100000.0));
Omar Emara commented 2024-03-27 09:23:18 +01:00
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Seems like we have fmod vector variants that should be used instead?

Seems like we have `fmod` vector variants that should be used instead?
Hoshinova marked this conversation as resolved
Brecht Van Lommel commented 2024-03-27 16:53:22 +01:00
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I'm guessing this gives a measure performance regression. It would be good to understand how big it is. Maybe we'll have to accept it.

I'm guessing this gives a measure performance regression. It would be good to understand how big it is. Maybe we'll have to accept it.
Hoshinova commented 2024-03-27 17:06:10 +01:00
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The noise is still continuous even after this change I think, though not differentiable. So maybe clarify the comment as well.

Since it's cutting a chunk of size 100000.0 out and pasting them on after each other, whereever 2 chunks meet there isn't anything that ensures continuity.

> The noise is still continuous even after this change I think, though not differentiable. So maybe clarify the comment as well. Since it's cutting a chunk of size 100000.0 out and pasting them on after each other, whereever 2 chunks meet there isn't anything that ensures continuity.
Hoshinova added 3 commits 2024-03-27 17:06:54 +01:00
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412084ee83 Merge branch 'main' into fix-119797
Hans Goudey commented 2024-03-27 17:12:19 +01:00
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@blender-bot package

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Blender Bot commented 2024-03-27 17:12:21 +01:00
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Package build started. Download here when ready.

Package build started. [Download here](https://builder.blender.org/download/patch/PR119884) when ready.
Hoshinova commented 2024-03-28 08:27:13 +01:00
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I'm guessing this gives a measure performance regression. It would be good to understand how big it is. Maybe we'll have to accept it.

@brecht I couldn't measure any performance differences:

Before fix:
before.png
19.94 seconds

After fix:
after.png
19.58 seconds

> I'm guessing this gives a measure performance regression. It would be good to understand how big it is. Maybe we'll have to accept it. @brecht I couldn't measure any performance differences: Before fix: ![before.png](/attachments/9dd53a1c-0da1-4c49-acec-daad2f9edf13) 19.94 seconds After fix: ![after.png](/attachments/54d8d13e-0166-43ea-897d-8d4f626b825e) 19.58 seconds
before.png
5.1 MiB
after.png
5.1 MiB
Brecht Van Lommel commented 2024-03-28 20:56:40 +01:00
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Thanks for testing the performance.

I'll do a build with GPU tests. Note that currently a few tests there are known to fail.

@blender-bot build +gpu linux

Thanks for testing the performance. I'll do a build with GPU tests. Note that currently a few tests there are known to fail. @blender-bot build +gpu linux
Brecht Van Lommel approved these changes 2024-03-28 21:01:12 +01:00
Omar Emara approved these changes 2024-03-29 09:31:20 +01:00
Brecht Van Lommel merged commit c78c6b0bdf into main 2024-03-29 16:12:34 +01:00
Brecht Van Lommel deleted branch fix-119797 2024-03-29 16:12:37 +01:00
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