Discared smoothing thicknes fro backrgound piels, fluid now looks better

shaders/final_combine.frag

@@ -100,8 +100,17 @@ void main()
     vec3 finalColor = fluidColor * lighting;
     finalColor     += fluidColor * fresnel;
 
+    //---------------------------------------
+    //  Attenuation
+    //---------------------------------------
+    float attenuation = texture(uLightAttenTex, TexCoords).r;
+    finalColor *= attenuation;
+
+    float alpha = texture(uLightAttenTex, TexCoords).a;
+    // float alpha = clamp(1.0 - attenuation, 0.0, 1.0);
+
     //---------------------------------------
     // 5) Output
     //---------------------------------------
-    FragColor = vec4(finalColor, 1.0);
+    FragColor = vec4(finalColor, alpha);
 }

shaders/thickness.frag

@@ -19,7 +19,7 @@ void main()
         discard;
 
     // For thickness: each particle in this pixel adds some amount.
-    float thicknessIncrement = 0.04;
+    float thicknessIncrement = 0.08;
 
     // Output that in the red channel. Using GL32F only reed chanele sotred  
     FragColor = vec4(thicknessIncrement, 0.0, 0.0, 1.0);

shaders/thickness_attenuation.frag

@@ -24,5 +24,15 @@ void main()
     //  to be fully absorbing, you do: finalColor = fluidColor * (1 - attenuation), etc.)
     //vec3 color = fluidColor * (1 - attenuation);
     //FragColor = vec4(color, 1.0);
-    FragColor = vec4(attenuation, 0.0, 0.0, 1.0);
+    float alpha = 0;
+
+    if(thicknessVal < 0.001) {
+        // Background
+        alpha = 0;
+    } else
+    {
+        alpha = clamp((1.0 - attenuation)*4, 0.0, 1.0);
+    }
+
+    FragColor = vec4(attenuation, 0.0, 0.0, alpha);
 }

shaders/thickness_filter.frag

@@ -16,6 +16,8 @@ void main()
     // Sample center
     float centerVal = texture(uThicknessTex, TexCoords).r;
 
+    if (centerVal < 0.01) discard;
+
     // Accumulate for a 1D Gaussian blur
     float sum = 0.0;
     float wSum = 0.0;
@@ -28,6 +30,8 @@ void main()
 
         float sampleVal = texture(uThicknessTex, sampleUV).r;
 
+        //if (sampleVal < 0.01) continue;
+
         // Spatial weight from precomputed array
         float w = gaussWeights[abs(i)];
 

src/FluidRenderer.cpp

@@ -989,7 +989,7 @@ void FluidRenderer::renderThicknessAttenFrame()
     glUniform1i(glGetUniformLocation(m_thicknessAttenProgram.programID, "uThicknessTex"), 0);
 
     // 3) Set uniform: absorption, fluidColor, etc.
-    float absorption = 0.8f; // tweak to taste
+    float absorption = 0.2f; // tweak to taste
     GLuint absorpLoc = glGetUniformLocation(m_thicknessAttenProgram.programID, "absorption");
     glUniform1f(absorpLoc, absorption);