Changeset 9425 for data/trunk/programs

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.

Location:

data/trunk/programs

Files:

• ps_glow.cg (modified) (1 diff)
• vs_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;
 }

data/trunk/programs/vs_glow.cg

@@ -1 @@
-void main(float4 position : POSITION, float3 normal : NORMAL, float2 uv : TEXCOORD0, out float4 oPosition : POSITION, out float2 oUv : TEXCOORD0, out float4 colour : COLOR,
-          uniform float4x4 worldViewProjMatrix, uniform float size_value, uniform float time )
+struct vertexIn
 {
-   float4 myPosition = position;
-   myPosition.xyz += size_value * (1.0 + (sin(time * 5.0) + 1.0)  / 5.0 ) * normal; 
-   oPosition = mul(worldViewProjMatrix, myPosition);
+    float4 position : POSITION;
+    float4 normal : NORMAL;
+    float2 uv : TEXCOORD0;
+};
+
+struct vertexOut
+{
+    float4 position : POSITION; //<! transformed position
+    float2 uv : TEXCOORD0; //<! passing on uv information
+    float3 worldNormal : TEXCOORD1; //<! surface normal transformed into world
+    float3 worldView : TEXCOORD2; //<! view direction transformed into world
+};
+
+vertexOut main(vertexIn input, uniform float4x4 iWorldTMatrix, uniform float4x4 iViewMatrix, uniform float4x4 worldMatrix, uniform float4x4 viewProjMatrix, uniform float inflate )
+{
+   vertexOut output;
+   float4 myPosition = input.position;
+   output.worldNormal=mul(iWorldTMatrix, input.normal).xyz; //transforming the normal
+   input.normal = normalize(float4(input.normal.xyz,0)); //normalizing the normal according to the three relevant parts
+   myPosition.xyz += inflate * input.normal; //inflating the model into a bigger shape
+   myPosition = mul(worldMatrix, myPosition); //transforming position into world
+   output.worldView = normalize(float3(iViewMatrix[0].w, iViewMatrix[1].w, iViewMatrix[2].w) - myPosition.xyz);//view direction according to world
+   output.position = mul(viewProjMatrix, myPosition); //finish transformation of the position into the projection space
+   output.uv = input.uv; //passing on uv information
+   return output;
 }
-