Color gradient ramp for glowing parts of the mesh

data/shaders/radialblur/colorpass.frag

@@ -3,11 +3,22 @@
 #extension GL_ARB_separate_shader_objects : enable
 #extension GL_ARB_shading_language_420pack : enable
 
+layout (binding = 1) uniform sampler2D samplerGradientRamp;
+
 layout (location = 0) in vec3 inColor;
+layout (location = 1) in vec2 inUV;
 
 layout (location = 0) out vec4 outFragColor;
 
 void main() 
 {
-	outFragColor.rgb = inColor;
+	// Use max. color channel value to detect bright glow emitters
+	if ((inColor.r >= 0.9) || (inColor.g >= 0.9) || (inColor.b >= 0.9)) 
+	{
+		outFragColor.rgb = texture(samplerGradientRamp, inUV).rgb;
+	}
+	else
+	{
+		outFragColor.rgb = inColor;
+	}
 }

data/shaders/radialblur/colorpass.vert

@@ -3,16 +3,18 @@
 #extension GL_ARB_separate_shader_objects : enable
 #extension GL_ARB_shading_language_420pack : enable
 
-layout (location = 0) in vec4 inPos;
+layout (location = 0) in vec3 inPos;
 layout (location = 2) in vec3 inColor;
 
 layout (binding = 0) uniform UBO 
 {
 	mat4 projection;
 	mat4 model;
+	float gradientPos;
 } ubo;
 
 layout (location = 0) out vec3 outColor;
+layout (location = 1) out vec2 outUV;
 
 out gl_PerVertex
 {
@@ -22,5 +24,6 @@ out gl_PerVertex
 void main() 
 {
 	outColor = inColor;
-	gl_Position = ubo.projection * ubo.model * inPos;
+	outUV = vec2(ubo.gradientPos, 0.0f);
+	gl_Position = ubo.projection * ubo.model * vec4(inPos, 1.0);
 }

data/shaders/radialblur/phongpass.frag

@@ -3,10 +3,13 @@
 #extension GL_ARB_separate_shader_objects : enable
 #extension GL_ARB_shading_language_420pack : enable
 
+layout (binding = 1) uniform sampler2D samplerGradientRamp;
+
 layout (location = 0) in vec3 inNormal;
 layout (location = 1) in vec3 inColor;
 layout (location = 2) in vec3 inEyePos;
 layout (location = 3) in vec3 inLightVec;
+layout (location = 4) in vec2 inUV;
 
 layout (location = 0) out vec4 outFragColor;
 
@@ -17,7 +20,7 @@ void main()
 	// to detect bright glow emitters
 	if ((inColor.r >= 0.9) || (inColor.g >= 0.9) || (inColor.b >= 0.9)) 
 	{
-		outFragColor.rgb = inColor;
+		outFragColor.rgb = texture(samplerGradientRamp, inUV).rgb;
 	}
 	else
 	{

data/shaders/radialblur/phongpass.vert

@@ -11,12 +11,14 @@ layout (binding = 0) uniform UBO
 {
 	mat4 projection;
 	mat4 model;
+	float gradientPos;
 } ubo;
 
 layout (location = 0) out vec3 outNormal;
 layout (location = 1) out vec3 outColor;
 layout (location = 2) out vec3 outEyePos;
 layout (location = 3) out vec3 outLightVec;
+layout (location = 4) out vec2 outUV;
 
 out gl_PerVertex
 {
@@ -27,6 +29,7 @@ void main()
 {
 	outNormal = inNormal;
 	outColor = inColor;
+	outUV = vec2(ubo.gradientPos, 0.0); 
 	gl_Position = ubo.projection * ubo.model * pos;
 	outEyePos = vec3(ubo.model * pos);
 	vec4 lightPos = vec4(0.0, 0.0, -5.0, 1.0);// * ubo.model;

data/shaders/radialblur/radialblur.frag

@@ -26,7 +26,7 @@ void main()
 	vec4 color = vec4(0.0, 0.0, 0.0, 0.0);
 	UV += radialSize * 0.5 - ubo.radialOrigin;
  
-	#define samples 16
+	#define samples 32
 
 	for (int i = 0; i < samples; i++) 
 	{