I’ve spent the last couple hours digging into why one of our custom shaders isn’t allowing us to bake a lightmap with it casting shadows as well as receiving the lightmap, but I’ve come at an impasse and I don’t know what to do. I’ve hobbled together what I could figure out from other threads, but I can’t seem to figure it out past this point.
Current Shader:
Default Unlit/Transparent Cutout:
Desired (achieved by reverting to my shader after performing a lightmap with Transparent Cutout turned on):
Current Code
//Unlit
//Lightmap support
//Texture
//Alpha
Shader "FFG/Lightmap/Unlit-Cutout" {
Properties {
_MainTex ("Base", 2D) = "white" {}
_Cutoff ("Cutoff Alpha", Range(0,1)) = 0.5
}
SubShader
{
Tags { "Queue"="AlphaTest" "IgnoreProjector" = "True" "RenderType"="TransparentCutout" }
Cull Off
Blend SrcAlpha OneMinusSrcAlpha
Pass {
Name "ForwardBase"
Tags { "LightMode" = "ForwardBase" }
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_fwdbase
#pragma multi_compile LIGHTMAP_ON LIGHTMAP_OFF
#include "UnityCG.cginc"
struct v2f
{
fixed4 pos : SV_POSITION;
fixed2 lmap : TEXCOORD1;
fixed2 pack0 : TEXCOORD0;
};
uniform sampler2D _MainTex;
uniform fixed4 _MainTex_ST;
uniform float _Cutoff;
#ifdef LIGHTMAP_ON
sampler2D unity_Lightmap;
fixed4 unity_LightmapST;
#endif
v2f vert(appdata_full v)
{
v2f o;
o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
o.pack0.xy = TRANSFORM_TEX(v.texcoord, _MainTex);
#ifdef LIGHTMAP_ON
o.lmap.xy = v.texcoord1.xy * unity_LightmapST.xy + unity_LightmapST.zw;
#endif
return o;
}
fixed4 frag(v2f i) : COLOR
{
fixed4 c = tex2D(_MainTex, i.pack0);
if(c.a <= _Cutoff) {
discard;
}
#ifdef LIGHTMAP_ON
c.rgb *= DecodeLightmap(tex2D(unity_Lightmap, i.lmap));
#endif
return c;
}
ENDCG
}
Pass {
Name "ShadowCollector"
Tags { "LightMode" = "ShadowCollector" }
Fog {Mode Off}
ZWrite On ZTest LEqual
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_shadowcollector
#define SHADOW_COLLECTOR_PASS
#include "UnityCG.cginc"
#include "AutoLight.cginc"
struct v2f {
V2F_SHADOW_COLLECTOR;
float2 uv : TEXCOORD5;
};
uniform float4 _MainTex_ST;
v2f vert (appdata_base v)
{
v2f o;
TRANSFER_SHADOW_COLLECTOR(o)
o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
return o;
}
uniform sampler2D _MainTex;
uniform fixed _Cutoff;
fixed4 frag (v2f i) : SV_Target
{
fixed4 texcol = tex2D( _MainTex, i.uv );
clip(texcol.a - _Cutoff );
SHADOW_COLLECTOR_FRAGMENT(i)
}
ENDCG
}
// Pass to render object as a shadow caster
Pass {
Name "ShadowCaster"
Tags { "LightMode" = "ShadowCaster" }
Offset 1, 1
Fog {Mode Off}
ZWrite On ZTest LEqual Cull Off
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_shadowcaster
#include "UnityCG.cginc"
#include "AutoLight.cginc"
struct v2f {
V2F_SHADOW_CASTER;
float2 uv : TEXCOORD1;
};
uniform float4 _MainTex_ST;
v2f vert( appdata_base v )
{
v2f o;
TRANSFER_SHADOW_CASTER(o)
o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
return o;
}
uniform sampler2D _MainTex;
uniform fixed _Cutoff;
float4 frag( v2f i ) : SV_Target
{
fixed4 texcol = tex2D( _MainTex, i.uv );
clip(texcol.a - _Cutoff );
SHADOW_CASTER_FRAGMENT(i)
}
ENDCG
}
}
}
Any assistance would be much appreciated!
I should mention that I grabbed the shader source for Unlit/Transparent Cutout and put it into a shader with a different name and it stops casting shadows properly. So is Unity hard coded to have different rendering settings with the default shaders based on their name?
