From 0cbb4c29262a9ba6a1615ce3ad29b2e4ff713eea Mon Sep 17 00:00:00 2001
From: Alexander Gauggel <agauggel@uni-koblenz.de>
Date: Fri, 25 Jun 2021 18:20:05 +0200
Subject: [PATCH] [#82] Reduce volumetric sample count to increase performance,
add additional noise to hide artifacts
---
projects/voxelization/resources/shaders/shader.frag | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/projects/voxelization/resources/shaders/shader.frag b/projects/voxelization/resources/shaders/shader.frag
index 7612025a..b5d1ccf6 100644
--- a/projects/voxelization/resources/shaders/shader.frag
+++ b/projects/voxelization/resources/shaders/shader.frag
@@ -82,19 +82,22 @@ float isotropicPhase(){
vec3 volumetricLighting(vec3 colorIn, vec3 V, vec3 pos, float d){
vec3 color = colorIn;
- int sampleCount = 48;
+ int sampleCount = 20;
float stepSize = d / sampleCount;
vec3 extinctionCoefficient = scatteringCoefficient + absorptionCoefficient;
- float noiseScale = 0.1;
+ float noise = 2 * pi * interleavedGradientNoise(gl_FragCoord.xy);
+ vec2 shadowOffset = 3.f * vec2(sin(noise), cos(noise)) / textureSize(sampler2D(shadowMap, shadowMapSampler), 0);
+
+ float noiseScale = 0.1f;
pos += V * noiseScale * interleavedGradientNoise(gl_FragCoord.xy);
for(int i = 0; i < sampleCount; i++){
vec3 samplePoint = pos + V * i * stepSize;
float phase = isotropicPhase();
vec3 light = lightInfo.sunColor * lightInfo.sunStrength;
- float shadow = shadowTest(samplePoint, lightInfo, shadowMap, shadowMapSampler, vec2(0));
+ float shadow = shadowTest(samplePoint, lightInfo, shadowMap, shadowMapSampler, shadowOffset);
light *= shadow;
light += volumetricAmbientLight;
--
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