Listing 3. Convert vertex object-space 3D coordinates into 2D screen coordinates.

33         v2f vert (appdata input)

34             {v2f output;

35             UNITY_SETUP_INSTANCE_ID(input);

36             UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);

37             output.position=UnityObjectToClipPos(input.vertex);

38             return output;}

39

40         fixed4 frag (v2f input) : SV_Target

41         {return fixed4(0.0, 0.0, 0.0, 0.0);}

42         ENDCG

43     }

44 }