From d06431b56f98809d1eceb32e33993f542363de85 Mon Sep 17 00:00:00 2001
From: Alexander Gauggel <agauggel@uni-koblenz.de>
Date: Fri, 25 Jun 2021 19:08:21 +0200
Subject: [PATCH] [#82] More robust and subtle lens distortion
---
.../resources/shaders/tonemapping.comp | 21 ++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)
diff --git a/projects/voxelization/resources/shaders/tonemapping.comp b/projects/voxelization/resources/shaders/tonemapping.comp
index 500fa0c2..8fa07d39 100644
--- a/projects/voxelization/resources/shaders/tonemapping.comp
+++ b/projects/voxelization/resources/shaders/tonemapping.comp
@@ -74,11 +74,22 @@ vec3 applyGrain(ivec2 uv, vec3 c){
}
vec2 computeDistortedUV(vec2 uv, float aspectRatio){
- vec2 toCenter = vec2(vec2(0.5) - uv);
- float r2 = dot(toCenter, toCenter);
- float k1 = 0.15f;
- float k2 = 0.2f;
- return uv + toCenter * (r2*k1 + r2*r2*k2);
+ uv = uv * 2 - 1;
+ float r2 = dot(uv, uv);
+ float k1 = 0.02f;
+
+ float maxR2 = dot(vec2(1), vec2(1));
+ float maxFactor = maxR2 * k1;
+
+ // correction only needed for pincushion distortion
+ maxFactor = min(maxFactor, 0);
+
+ uv /= 1 + r2*k1;
+
+ // correction to avoid going out of [-1, 1] range when using barrel distortion
+ uv *= 1 + maxFactor;
+
+ return uv * 0.5 + 0.5;
}
float computeLocalContrast(vec2 uv){
--
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