2D Sprite can't receive Shadows

Unity Engine
1

hi guys, i have a problem with shadows receiving on sprite
well i have some cute shadow-cast shader:

Shader "Sprites/Diffuse/Shadows"
{
    Properties
    {
        [PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
        _Color("Tint", Color) = (1,1,1,1)
        [MaterialToggle] PixelSnap("Pixel snap", Float) = 0
        _Cutoff("Shadow alpha cutoff", Range(0,1)) = 0.5
    }

        SubShader
    {
        Tags
    {
        "Queue" = "Transparent"
        "IgnoreProjector" = "True"
        "RenderType" = "Transparent"
        "PreviewType" = "Plane"
        "CanUseSpriteAtlas" = "True"
    }

        Cull Off
        Lighting Off
        ZWrite Off
        Blend One OneMinusSrcAlpha

        CGPROGRAM
#pragma surface surf Lambert vertex:vert nofog keepalpha addshadow
#pragma multi_compile _ PIXELSNAP_ON


    sampler2D _MainTex;
    fixed4 _Color;

    struct Input
    {
        float2 uv_MainTex;
        fixed4 color;
    };

    void vert(inout appdata_full v, out Input o)
    {
#if defined(PIXELSNAP_ON)
        v.vertex = UnityPixelSnap(v.vertex);
#endif

        UNITY_INITIALIZE_OUTPUT(Input, o);
        o.color = v.color * _Color;
     
    }


    fixed _Cutoff;
    void surf(Input IN, inout SurfaceOutput o)
    {
        fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * IN.color;
        o.Albedo = c.rgb;
        o.Alpha = c.a;
        clip(o.Alpha - _Cutoff);
    }


    ENDCG
    }
        Fallback "Transparent/Cutout/VertexLit"
}

this shader allows my sprites to cast some shadows but they cant be received by them.
how can i add the possibility of receiving shadows in this shader?
spriteRenderer.receiveShadows is ON
spriteRenderer.castShadows is ON too.

P.S. yes, i know that meshRenderer could receive any shadow, but i need to attach this possibility to sprites.
please help!)

2

if you are using desktop then this shader is built into unity? see standard shader drop down for blend modes like Transparent, Fade, Cutout…

3

did anyone received shadow by sprite?

4

Anything with a transparency queue will not receive shadows.

Try “Queue”=“AlphaTest” “RenderType”=“TransparentCutout” ZWrite On and remove the blend line.

5

i tried now, it does not work :X
here is some explanation about my problem:

bg is mesh with standart shader, it receive shadows easily
if sprite’s shadow comes on other sprite, it isnt receiving by it
i turned off bg “receiveShadows”:

which part of standart(specular) shader allows it to receive shadows?
must i mix it with my shader or something?

1 Like
6

You might try adding fullforwardshadows to the #pragma surface line, along with replacing keepalpha with alphatest:_Cutoff

7

nope :frowning:
which code allows to receive shadows in Unity?

8

OK, i found the solution
if someone needed, you can get it from my github:

9

Hi @anlev ,

Could you please show me how to use your shader in version 5.4 of Unity? You have a sample project? I’m having trouble playing shadows on my sprite object :frowning:

Please!

10

This shader will create shadows for Sprites, but it will disable partial transparency on the Sprite.