Changeset 9425 for data/trunk/programs/ps_glow.cg

Timestamp:

Oct 31, 2012, 6:02:05 PM (12 years ago)

Author:

davidsa

Message:

Improved glow effect, added some minor documentation to the glow.material file.

File:

• data/trunk/programs/ps_glow.cg (modified) (1 diff)

data/trunk/programs/ps_glow.cg

@@ -1 @@
-float4 main(uniform float alpha_value, uniform float time, uniform float4 color) : COLOR
+struct vertexOut
 {
-    color.w =  alpha_value * ((sin(time * 5.0) / 3.14 + 1.0) / 2.0 );
+    float4 position : POSITION;
+    float2 uv : TEXCOORD0;
+    float3 worldNormal : TEXCOORD1;
+    float3 worldView : TEXCOORD2;
+};
+
+float4 main(vertexOut input, uniform float alphaValue, uniform float cutoffAngle, uniform float exponent, uniform float time, uniform float4 color) : COLOR
+{
+    float3 Nn = normalize(input.worldNormal);
+    float3 Vn = normalize(input.worldView);
+    float alphaMod = dot(Nn, Vn);//this is a measure for how close we are to the edge of a model according to our view
+    float cutoff=cos(cutoffAngle * 3.14 / 180.0);//pi divided by 180
+    if(alphaMod<cutoff)//transform output range so it only affects angles close to 90 degrees
+    {
+        alphaMod/=cutoff;
+    }
+    else
+    {
+        alphaMod=1.0;
+    }
+    alphaMod = pow(alphaMod,exponent); //how fast should the intensity of the glow decrease
+    color.w = alphaMod * alphaValue * ((sin(time)/3.14 + 1.0) / 2.0 + 0.1);
     return color;
 }