Keywords and UsePass

Unity Engine
1

So I’m trying to build a shader that extends the Standard shader a little bit, adding a simple color overlay. So I wrote this shader:

Shader "EncounterMapLayer" {
    Properties {
        _Color("Color", Color) = (1,1,1,1)
        _MainTex("Albedo", 2D) = "white" {}
      
        _Cutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5

        _Glossiness("Smoothness", Range(0.0, 1.0)) = 0.5
        [Gamma] _Metallic("Metallic", Range(0.0, 1.0)) = 0.0
        _MetallicGlossMap("Metallic", 2D) = "white" {}

        _BumpScale("Scale", Float) = 1.0
        _BumpMap("Normal Map", 2D) = "bump" {}

        _Parallax ("Height Scale", Range (0.005, 0.08)) = 0.02
        _ParallaxMap ("Height Map", 2D) = "black" {}

        _OcclusionStrength("Strength", Range(0.0, 1.0)) = 1.0
        _OcclusionMap("Occlusion", 2D) = "white" {}

        _EmissionColor("Color", Color) = (0,0,0)
        _EmissionMap("Emission", 2D) = "white" {}
      
        _DetailMask("Detail Mask", 2D) = "white" {}

        _DetailAlbedoMap("Detail Albedo x2", 2D) = "grey" {}
        _DetailNormalMapScale("Scale", Float) = 1.0
        _DetailNormalMap("Normal Map", 2D) = "bump" {}

        [Enum(UV0,0,UV1,1)] _UVSec ("UV Set for secondary textures", Float) = 0

        // UI-only data
        [HideInInspector] _EmissionScaleUI("Scale", Float) = 0.0
        [HideInInspector] _EmissionColorUI("Color", Color) = (1,1,1)

        // Blending state
        [HideInInspector] _Mode ("__mode", Float) = 0.0
        [HideInInspector] _SrcBlend ("__src", Float) = 1.0
        [HideInInspector] _DstBlend ("__dst", Float) = 0.0
        [HideInInspector] _ZWrite ("__zw", Float) = 1.0

        // Extra color map
        [HideInInspector] _TileColorMap("Tile Color", 2D) = "white" {}
    }

    CGINCLUDE
        #define UNITY_SETUP_BRDF_INPUT MetallicSetup
    ENDCG

    SubShader {
        Tags { "RenderType"="Opaque" "PerformanceChecks"="False" }
        LOD 300

        UsePass "Standard/FORWARD"
        UsePass "Standard/FORWARD_DELTA"
        UsePass "Standard/ShadowCaster"
        UsePass "Standard/DEFERRED"

        Pass {
            Blend DstColor Zero
            SetTexture [_TileColorMap] { combine texture }
        }
    }

    SubShader {
        Tags { "RenderType"="Opaque" "PerformanceChecks"="False" }
        LOD 150

        UsePass "Standard/FORWARD"
        UsePass "Standard/FORWARD_DELTA"
        UsePass "Standard/ShadowCaster"

        Pass {
            Blend DstColor Zero
            SetTexture [_TileColorMap] { combine texture }
        }
    }

    FallBack "VertexLit"
    CustomEditor "StandardShaderGUI"
}

I use the UsePass to avoid duplicating any more of the Standard Shader than I have to. Unfortunately, when I do this, the normal mapping turns off. My best guess as to why is that the “_NORMALMAP” keyword somehow doesn’t propagate through UsePass.

If I copy all of the passes into my shader directly, instead of using UsePass, then the normal mapping starts working again. That’ll work, but I’d rather not do that if I don’t have to.

2

This is an old post, but I came across something that may be relevant here and it seems to be the only post that I can find which is related to this issue, so I figured I would post here…

So, it seems if you change “Standard/ShadowCaster” to “Standard/SHADOWCASTER” it suddenly starts to work the exact same as the Standard shader. So it seems it is an issue related to capitalization even though this is not documented anywhere (that I can find) and it is NOT even capitalized in the Standard shader code where it is defined.

Anyway, that is just something I discovered. Hope it might help someone else.

1 Like
3

UsePass requires you to use ALL CAPS when specifying the pass name, no matter the casing of the actual pass. This quirk is barely documented at the bottom of its manual page:

Note that internally all pass names are uppercased, so UsePass must refer to the name in uppercase.

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