Mirror + Shadows shader.

Questions & Answers
1

I'm trying to make a floor with a wood texture and a reflection. It's works for my using the mirror reflection shader from Unity Community. But, i need to include shadows and i don't have idea how to do it. Thanks.

2

I got it, only modify the shader:

Shader "FX/Mirror Reflection" { 
Properties {
	_Color ("Main Color", Color) = (1,1,1,1)
	_ReflectColor ("Reflection Color", Color) = (1,1,1,0.5)
	_MainTex ("Base (RGB) RefStrength (A)", 2D) = "white" {} 
	_ReflectionTex ("Reflection", 2D) = "_Skybox" { TexGen ObjectLinear }
}
SubShader {
	LOD 200
	Tags { "RenderType"="Opaque" }
	Pass { 
		Name "BASE"
		Tags {"LightMode" = "Always"}
		CGPROGRAM
		#pragma vertex vert
		#pragma fragment frag
		#pragma fragmentoption ARB_fog_exp2
		#pragma fragmentoption ARB_precision_hint_fastest
		#include "UnityCG.cginc"

		struct v2f {
			V2F_POS_FOG;
			float2 uv : TEXCOORD0;
			float3 uv2 : TEXCOORD1;
		};

		uniform float4 _MainTex_ST;
		uniform float3x3 _ProjMatrix;

		v2f vert(appdata_tan v)
		{
			v2f o;
			PositionFog( v.vertex, o.pos, o.fog );
			float3 viewDir = ObjSpaceViewDir( v.vertex );
			o.uv2 = mul( _ProjMatrix, viewDir );
			o.uv = TRANSFORM_TEX(v.texcoord,_MainTex);
			return o; 
		}

		uniform sampler2D _MainTex;
		uniform sampler2D _ReflectionTex;
		uniform float4 _ReflectColor;

		half4 frag (v2f i) : COLOR
		{
			half4 texcol = tex2D (_MainTex, i.uv);
			half4 reflcol = tex2Dproj( _ReflectionTex, i.uv2 ) * 2;
			reflcol *= _ReflectColor.a;
			return reflcol * _ReflectColor;
		} 
		ENDCG
	}

	UsePass "Diffuse/PPL"
} 
FallBack "Reflective/VertexLit", 1

}

3

your shader doesnt seem to work like the original mirror shader does... I cant get it to reflect anything.

4

Same, it seems only my sky colour gets reflected.

Edit: I hacked this together from your mirror code and the water code that comes with unity pro, it seems to work well on my side.

Shader "FX/Mirror Reflection"
{
    Properties
    {
        _Color ("Main Color", Color) = (1,1,1,1)
        _ReflectColor ("Reflection Color", Color) = (1,1,1,0.5)
        _MainTex ("Base (RGB) RefStrength (A)", 2D) = "white" {} 
        _ReflDistort ("Reflection distort", Range (0,1.5)) = 0.44
        _ReflectionTex ("Reflection", 2D) = "white" { TexGen ObjectLinear }
    }

    SubShader
    {
        LOD 200
        Tags { "RenderType"="Opaque" }
        Pass { 
            Name "BASE"
            Tags {"LightMode" = "Always"}
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma fragmentoption ARB_fog_exp2
            #pragma fragmentoption ARB_precision_hint_fastest
            #include "UnityCG.cginc"

            uniform float4 _MainTex_ST;
            uniform float3x3 _ProjMatrix;

            struct appdata {
                float4 vertex : POSITION;
                float3 normal : NORMAL;
                float2 texcoord : TEXCOORD1;
            };            

            struct v2f {
                V2F_POS_FOG;
                float3 ref;
                float2 uv;
                float3 viewDir;
            };

            v2f vert(appdata v)
            {
                v2f o;
                PositionFog( v.vertex, o.pos, o.fog );

                // object space view direction (will normalize per pixel)
                o.viewDir.xzy = ObjSpaceViewDir(v.vertex);

                // calculate the reflection vector
                float3x4 mat = float3x4 (
                    0.5, 0, 0, 0.5,
                    0, 0.5 * _ProjectionParams.x, 0, 0.5,
                    0, 0, 0, 1
                );    
                o.ref = mul (mat, o.pos);
                o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);

                return o;
            }

            uniform sampler2D _MainTex;
            uniform sampler2D _ReflectionTex;
            uniform float4 _ReflectColor;
            uniform float _ReflDistort;

            half4 frag (v2f i) : COLOR
            {
                half4 texcol = tex2D (_MainTex, i.uv);

                float3 uv2 = i.ref; 
                half4 reflcol = tex2Dproj( _ReflectionTex, uv2 ) * 1;
                reflcol *= _ReflectColor.a;
                return reflcol * _ReflectColor;
            } 
            ENDCG
        }

        UsePass "Diffuse/PPL"
    }

    FallBack "Reflective/VertexLit", 1
}
5

I don’t know why this not work on my PC. Can you help me ?

6

Hello,
I would like to pass a matrix 4x4 to my shader from my csharp script.
In my shader I put in the CGPROGRAM part :

uniform float3x3 _ProjMatrix;

And in my script I put :

mat.SetMatrix( "_ProjMatrix", mtx );

If I use a shaderLab shader I can access it doing :

matrix [_ProjMatrix]

But in a vertex, fragment shader I cannot acces it.

Can you help me plase? In your shader, how do you supply _ProjMatrix?

Thanks.