From 66b597818221166e46e4af091ece024609bbdbbe Mon Sep 17 00:00:00 2001
From: Alexander Gauggel <agauggel@uni-koblenz.de>
Date: Mon, 16 Aug 2021 16:13:39 +0200
Subject: [PATCH] [#106] Fix motion blur image border artifacts
---
.../indirect_dispatch/resources/shaders/motionBlur.comp | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/projects/indirect_dispatch/resources/shaders/motionBlur.comp b/projects/indirect_dispatch/resources/shaders/motionBlur.comp
index a90e142d..42f6c431 100644
--- a/projects/indirect_dispatch/resources/shaders/motionBlur.comp
+++ b/projects/indirect_dispatch/resources/shaders/motionBlur.comp
@@ -43,8 +43,10 @@ void main(){
vec3 color = vec3(0);
const int sampleCount = 16;
- vec2 uvStart = uv - motion;
- vec2 uvEnd = uv + motion;
+ // clamping start and end points avoids artifacts at image borders
+ // the sampler clamps the sample uvs anyways, but without clamping here, many samples can be stuck at the border
+ vec2 uvStart = clamp(uv - motion, 0, 1);
+ vec2 uvEnd = clamp(uv + motion, 0, 1);
for(int i = 0; i < sampleCount; i++){
vec2 sampleUV = mix(uvStart, uvEnd, i / float(sampleCount - 1));
--
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