Changeset 9425

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

Files:

• materials/glow.material (modified) (2 diffs)
• programs/ps_glow.cg (modified) (1 diff)
• programs/vs_glow.cg (modified) (1 diff)

data/trunk/materials/glow.material

@@ -1 +1 @@
 vertex_program glow_vs cg
 {
-        source vs_glow.cg
-        entry_point main
-        profiles vs_1_1 arbvp1
+        source vs_glow.cg
+        entry_point main
+        profiles vs_1_1 arbvp1
 }
 
 fragment_program glow_ps cg
 {
-        source ps_glow.cg
-        entry_point main
-        profiles ps_2_0 arbfp1  
+        source ps_glow.cg
+        entry_point main
+        profiles ps_2_0 arbfp1  
 }
-
 
 material glow
 {
-        technique
-        {
-                pass
-                {
-                        scene_blend alpha_blend
-                        depth_check on
-                        lighting off
-                        emissive 0.5 0.9 1.0 0.0
-                        
-                        vertex_program_ref glow_vs
-                        {
-                                param_named_auto worldViewProjMatrix worldviewproj_matrix
-                                param_named size_value float 0.3
-                                param_named_auto time time_0_x 50
-                        }
-                        
-                        fragment_program_ref glow_ps
-                        {
-                                param_named alpha_value float 0.4
-                                param_named_auto time time_0_x 50
-                                param_named_auto color surface_emissive_colour
-                        }
-                }
-                
-        }
+        technique
+        {
+                pass
+                {
+                        scene_blend alpha_blend
+                        depth_check on
+                        depth_func less_equal
+                        lighting off
+                        emissive 0.5 0.9 1.0 0.0 //what color should the glow be, emissive light can be changed through ogre as well
+                        
+                        vertex_program_ref glow_vs
+                        {
+                                param_named_auto iWorldTMatrix inverse_transpose_world_matrix //don't worry about auto parameters here, they are given
+                                param_named_auto iViewMatrix inverse_view_matrix
+                                param_named_auto worldMatrix   world_matrix
+                                param_named_auto viewProjMatrix viewproj_matrix
+                                param_named inflate float 0.05 //how much should the glow expand from the model, usually a small value
+                        }
+                        
+                        fragment_program_ref glow_ps
+                        {
+                                param_named alphaValue float 0.5 //base alpha value of glow
+                                param_named cutoffAngle float 70.0 //from which view to surface normal angle on should the intensity of the glow decrease
+                                param_named exponent float 2.5 //by which exponent should the intensity decrease
+                                param_named_auto time time_0_x 50 //how fast should the light pulsate
+                                param_named_auto color surface_emissive_colour //don't worry about this one, it makes sure we use the emissive color value
+                        }
+                }
+                
+        }
 }
 
@@ -67 +71 @@
                         vertex_program_ref glow_vs
                         {
-                                param_named_auto worldViewProjMatrix worldviewproj_matrix
-                                param_named size_value float 0.2
-                                param_named_auto time time_0_x 50
+                                param_named_auto iWorldTMatrix inverse_transpose_world_matrix
+                                param_named_auto iViewMatrix inverse_view_matrix
+                                param_named_auto worldMatrix   world_matrix
+                                param_named_auto viewProjMatrix viewproj_matrix
+                                param_named inflate float 0.2
                         }
                         
                         fragment_program_ref glow_ps
                         {
-                                param_named alpha_value float 0.4
+                                param_named alphaValue float 0.4
+                                param_named cutoffAngle float 70.0
+                                param_named exponent float 2.5
                                 param_named_auto time time_0_x 50
                                 param_named_auto color surface_emissive_colour

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;
 }
-