Grid shader

Author: przemyslawzaworski

wireframe.shader

@@ -0,0 +1,52 @@
+//Shader uses screen-space partial derivatives, works the best with terrain meshes.
+
+Shader "Wireframe"
+{
+	Properties
+	{
+		[Header(Settings)] [Toggle] _transparency ("Transparency", Float) = 1					
+	}
+	Subshader
+	{
+		Pass
+		{
+			Cull Off
+			CGPROGRAM
+			#pragma vertex vertex_shader
+			#pragma fragment pixel_shader
+			#pragma target 3.0
+			
+			struct structure
+			{
+				float4 gl_Position : SV_POSITION;
+				float3 vertex : TEXCOORD0;
+			};
+
+			float _transparency;
+			
+			structure vertex_shader (float4 vertex:POSITION) 
+			{
+				structure vs;
+				vs.gl_Position = UnityObjectToClipPos (vertex);
+				vs.vertex = vertex;
+				return vs;
+			}
+
+			float4 pixel_shader (structure ps) : COLOR
+			{
+				float2 p = ps.vertex.xz;
+				float2 g = abs(frac(p - 0.5) - 0.5) / fwidth(p);
+				float s = min(g.x, g.y);
+				float4 c =  float4(s,s,s, 1.0);	
+				if (c.r<1.0)
+					return 1.0-c;
+				else
+				{
+					if (_transparency==1) discard;
+					return 0;
+				}
+			}
+			ENDCG
+		}
+	}
+}