Weird color artifacts w color grading

jonarnold · January 24, 2021, 10:43pm

Hey all, I’m getting weird color artifacts when I apply color grading, even with a neutral LUT. Anyone seen this or know how to solve?

https://playground.babylonjs.com/#23YL1J#8

JacobF · January 24, 2021, 11:30pm

Random observation… I’ve been using the ColorCorrectionPostProcess, problem doesn’t seem to exist there.

https://playground.babylonjs.com/#23YL1J#9

Edit:

Looking at

github.com

BabylonJS/Babylon.js/blob/master/src/PostProcesses/colorCorrectionPostProcess.ts

import { PostProcess, PostProcessOptions } from "./postProcess";
import { Effect } from "../Materials/effect";
import { Texture } from "../Materials/Textures/texture";
import { Engine } from "../Engines/engine";
import { Camera } from "../Cameras/camera";

import "../Shaders/colorCorrection.fragment";
import { _TypeStore } from '../Misc/typeStore';
import { SerializationHelper, serialize } from '../Misc/decorators';
import { Nullable } from '../types';

declare type Scene = import("../scene").Scene;

/**
 *
 * This post-process allows the modification of rendered colors by using
 * a 'look-up table' (LUT). This effect is also called Color Grading.
 *
 * The object needs to be provided an url to a texture containing the color
 * look-up table: the texture must be 256 pixels wide and 16 pixels high.

This file has been truncated. show original

We can see the need for

    lutTexture.anisotropicFilteringLevel = 1;
    lutTexture.wrapU = BABYLON.Texture.CLAMP_ADDRESSMODE;
    lutTexture.wrapV = BABYLON.Texture.CLAMP_ADDRESSMODE;

Adding those fixes the issue:
https://playground.babylonjs.com/#23YL1J#10

The line about anisotropicFilteringLevel seems to be missing here:

jonarnold · January 25, 2021, 12:08am

Wow great catch @JacobF – that second docs link was the one I was working from and it is indeed missing the anisotropicFilteringLevel line. That totally fixed it. THANK YOU!!

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Weird color artifacts w color grading

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