Question by rustyruss1985 · Mar 28, 2020 at 04:09 PM · 2d shader transparency directional light point light

point light illuminates makes transparent object visible

Hello, i'm trying to implement shadows in a 2d game with an orthographic camera, so i did the following: 1) create a transparent sphere under each character's sprite 2) use directional light to cast shadows on the sphere (so the sphere is not visible, and it looks like the sprite is casting the shadow)

this works well (See figure without point light) but when i add a point light to my scene, the spheres become visible again.

does anyone know what i can do to stop the spheres from re-appearing when i use a point light? maybe some modifications to my shader (below)?

thanks!

 Shader "Custom/Transparent Shadow Receiver" {
     Properties{
     }
     SubShader{
         Tags {"Queue" = "AlphaTest" "IgnoreProjector" = "True" "RenderType" = "TransparentCutout"}
         LOD 200
         ZWrite Off
         Blend Zero SrcColor
     CGPROGRAM
     #pragma surface surf ShadowOnly alphatest:_Cutoff
     fixed4 _Color;
     struct Input {
         float2 uv_MainTex;
     };
     inline fixed4 LightingShadowOnly(SurfaceOutput s, fixed3 lightDir, fixed atten)
     {
         fixed4 c;
         c.rgb = s.Albedo * atten;
         c.a = s.Alpha;
         return c;
     }
     void surf(Input IN, inout SurfaceOutput o) {
         o.Albedo = 1;
         o.Alpha = 1;
     }
     ENDCG
     }
         Fallback "Transparent/Cutout/VertexLit"
 }

alt text