First commit.

Author: przemyslawzaworski

Diff for: orthogonal_sphere.shader

@@ -0,0 +1,62 @@
+Shader "Orthogonal sphere"
+{
+	Properties
+	{
+		_lightcolor("Light Color", Color) = (0.0,1.0,0.0,1.0) 
+		_lightposition("Light Position", Vector) = (8.0,0.0,10.0,1.0)
+	}
+	Subshader
+	{
+		Pass
+		{
+			CGPROGRAM
+			#pragma vertex vertex_shader
+			#pragma fragment pixel_shader
+			#pragma target 2.0
+
+			float4 _lightcolor, _lightposition;
+			
+			struct type
+			{
+				float4 vertex : SV_POSITION;
+				float2 uv : TEXCOORD0;
+			};
+	
+			float3 sphere (float2 p, float s)
+			{
+				float z = sqrt(abs(s*s-dot(p,p)));
+				return float3(p,z);
+			}
+
+			float3 map (float2 p)
+			{
+				return sphere(p,0.5);
+			}
+
+			float4 lighting (float2 p)
+			{
+				float3 AmbientLight = float3 (0.0,0.0,0.0);
+				float3 LightDirection = normalize(_lightposition);
+				float3 NormalDirection = normalize(map(p));
+				float3 LightColor = _lightcolor.xyz;
+				float3 DiffuseColor = max(dot(NormalDirection,LightDirection),0.0)*LightColor+AmbientLight;
+				return float4(DiffuseColor,1.0); 
+			}
+
+			type vertex_shader (float4 vertex:POSITION, float2 uv:TEXCOORD0)
+			{
+				type vs;
+				vs.vertex = mul(UNITY_MATRIX_MVP,vertex);
+				vs.uv = uv;
+				return vs;
+			}
+
+			float4 pixel_shader (type ps) : SV_TARGET
+			{
+				float2 uv = 2.0*ps.uv.xy-1.0;
+				return lighting(uv);	
+			}
+			ENDCG
+		}
+	}
+}