Hello,
I’m using a movie for ‘emission’ map
Ideally, I would like to be able to use a ‘unlit’ shader (so that the screen is always perfectly displayed) AND use a meta pass with a intensity slider to be able to boost emission power over 1 !
Is this possible or is it a total non sense? (shader noob here 
)
Thanks!!
simple way, you could use a unlit shader to render your TV and use a second mesh to render your emission. The second mesh would be in a layer that is not rendered by your camera, this way you can crank up the emission and the TV would not change, only the light emitted.
more complex way, make a custom shader that changes the value only in the meta pass, look at the built in standard shader, it has a meta pass you could use.
Probably the best way, yeah.
Unfortunately, I’m new to all this (including Unity ;)) I’ve already this piece of code, just missing a slider to boost emission power over 1 ! (as one can do for ‘emission’ power in the standard shader)
Shader "Custom/metaPassShader"{
Properties {
_Color ("Color", Color)=(1,1,1,1)
_MainTex ("Albedo (RGB)",2D)="white"{}
_Glossiness ("Smoothness", Range(0,1))=0.5
_Metallic ("Metallic", Range(0,1))=0.0
_GIAlbedoColor ("Color Albedo (GI)", Color)=(1,1,1,1)
_GIAlbedoTex ("Albedo (GI)",2D)="white"{}
}
SubShader {
// ------------------------------------------------------------------
// Extracts information for lightmapping, GI (emission, albedo, ...)
// This pass is not used during regular rendering.
Pass
{
Name "META"
Tags {"LightMode"="Meta"}
Cull Off
CGPROGRAM
#include"UnityStandardMeta.cginc"
sampler2D _GIAlbedoTex;
fixed4 _GIAlbedoColor;
float4 frag_meta2 (v2f_meta i): SV_Target
{
// We're interested in diffuse & specular colors
// and surface roughness to produce final albedo.
FragmentCommonData data = UNITY_SETUP_BRDF_INPUT (i.uv);
UnityMetaInput o;
UNITY_INITIALIZE_OUTPUT(UnityMetaInput, o);
fixed4 c = tex2D (_GIAlbedoTex, i.uv);
o.Albedo = fixed3(c.rgb * _GIAlbedoColor.rgb);
o.Emission = Emission(i.uv.xy);
return UnityMetaFragment(o);
}
#pragma vertex vert_meta
#pragma fragment frag_meta2
#pragma shader_feature _EMISSION
#pragma shader_feature _METALLICGLOSSMAP
#pragma shader_feature ___ _DETAIL_MULX2
ENDCG
}
Tags {"IgnoreProjector"="True" "RenderType"="Opaque"}
LOD 200
CGPROGRAM
// Physically-based Standard lighting model, and enable shadows on all light types
#pragma surface surf Standard fullforwardshadows nometa
// Use Shader model 3.0 target, to get nicer looking lighting
#pragma target 3.0
sampler2D _MainTex;
struct Input {
float2 uv_MainTex;
};
half _Glossiness;
half _Metallic;
fixed4 _Color;
void surf (Input IN,inout SurfaceOutputStandard o){
// Albedo comes from a texture tinted by color
fixed4 c = tex2D (_MainTex, IN.uv_MainTex)* _Color;
o.Albedo = c.rgb;
// Metallic and smoothness come from slider variables
o.Metallic = _Metallic;
o.Smoothness = _Glossiness;
o.Alpha = c.a;
}
ENDCG
}
FallBack "Diffuse"
}
is replacing
o.Emission = Emission(i.uv.xy);
by
o.Emission = Emission(i.uv.xy) * _SomeFloatValue;
and setting the _SomeFloatValue to somthing higher than 1 works?
YanVerde, thanks for your reply!
No, it doesn’t!