[Released] Fast LUT - quick LUT post-process

I'd like to introduce new post-process effect plugin: Fast LUT.

It may look as typical LUT post-process but its strength is in performance. It's well optimized shader (based on baked 3D LUT texture) which makes this post-process faster than others event by 40%!

Requirements for mobile devices: used shader require at least GLES 3.0, because it uses 3D texture sampling.

Where you can find it? Here: https://assetstore.unity.com/packages/vfx/shaders/fullscreen-camera-effects/fast-lut-112265

LUT post-process comparison:


Fast LUT used in game:


And on Viking Village:

 

Does this support Single pass stereo rendering on the Gear/Oculus Go? It seems pretty much impossible to find an image effect that does.

 

Hi,
I've not tested it on gear/oculus go. Do you know what can be the reason why other postprocesses don't work? From my knowledge if postprocess uses basic path for camera effects it should just work.

Edit:
I've read that people achieved to use even Unity Post Processing stack somehow on Gear VR so this one should be possible even more.
Fast LUT is contains very simple postprocess script, it doesn't use any additional render texture samplings so the only case is if you can connect postprocess to Camera object or not. If you buy this plugin and you will know if it's working as you expect or not, please contact me on mail because I'm also curious if it works on Gear VR + maybe I'll be able to help you if it does not work in your case.

 

After tests on oculus and htc vive I can confirm that FastLUT is working for VR without any problems

 

@MODev Just purchased your FastLUT, I'm developing for Oculus Go, and wondering which camera (right, Center, left) should I attach your script? I tried Center camera and it shows a white screen, adding to Left camera does not seem to do anything.

Are you able to test your FastLUT on Go or Gear VR?

tnx,

 

Hi @VJFader, FastLUT wasn't tested on GearVR but I may have idea why it's not working. Issue can be probably fixed by this: https://docs.unity3d.com/Manual/Android-SinglePassStereoRendering.html . If you write to me on support mail (please send your invoice ID so I can verify thet's you) I can send you modified FastLUT shader with solution from above link.

 

Hi there. Does this work with Amplify LUTs, and does it have LUT blending? Thanks.

 

Hi, yes in FastLUT you can load AmplifyLUTs format (it will be converted by plugin to it's own, which can be loaded by shader faster).
About blending: I have it in plans (because many customers ask for this) but for now it's not added. The main idea of FastLUT was to work as fast as possible, that's why blending is missing now

 

Hey there. Does it work with LWRP/HDRP?

 

Hi,
Until case with lwrp/hdrp shaders won't stabilize it won't be supported by FastLUT.

 

Alright, thanks for the answer

 

Hello, quick info: does it work with oculus quest?

 

Hey, this tool is working for sure for Oculus/Gear VR/Oculus go but it wasn't tested for oculus quest till now. I've send you special offer on pm.


Edit: info for other users: after tests we can confirm that it also works on Oculus Quest

 

Hi. When you compare performance with "other assets" in the description, what exactly "assets" you refer to?

 

@vof-t we have tested on multiple other assets but this from image is Amplify Color as I remember (hard to be sure after 2 years since release but probably it is AC). You may find that most of LUT postprocesses will have similar to "other asset" times because difference is in shader implementation and texture use - just FastLUT uses a bit different solution.

 

Is Unity 2020 not supported?

 

Unity 2020 is supported (for some reason information is missing on asset store description - we will update this soon)

 

Hi there! I was wondering if your fast lut could be added as a final step to my custom fragment shader instead of using it as a postprocress on the camera / without fetching the framebuffer. I am developing for Quest on URP and i am very able to translate Shaders from shaderlab to hlsl/urp.
Also how many fragment instructions does your lut postprocess generate? I am working on an incredibly tight rendering budget, so every little thing counts.

 

Hey, it depends on what variant you will use, the cheapest one (not high color range which needs 1x staturate and no intensity scaling - it would give 1x lerp):
-1x UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX (probably you won't need this)
-1x UNITY_SAMPLE_SCREENSPACE_TEXTURE (this is to sample screen texture, if you want to make it in object shader, than you probably have simple tex2D etc)
-1x tex3D (that's the core of FastLut)
As you can see when you have 3D texture produced by FastLut it's generally tex3D which converts current color to desired one

 

Hi, we haven't got any email about this issue. Can you please provide us screen from profiler so we could check what's happening? Also please provide us information about render time with and without FastLUT (as FPS may be not so relevant, depends on scale - for example for average 30 FPS you may get drop 1 FPS but for 1000 FPS you could get 300 FPS drop for the same feature render time) or at least let us know from how many FPS this drop gone. Our customers already used Oculus Quest etc and didn't reported that high FPS drop.