"Material doesn't have a ... property" 使用超过 3 个 2D 纹理时

Question

我写了多个fixed function Shaders。我注意到一旦着色器包含超过 3 个 2D 纹理，着色器就会中断并统一报告每个属性的 Material doesn't have a ... property... material 有。例如：

Shader "Custom/JustAnotherShader" {
    Properties{
        _MainTex("Base (RGB)", 2D) = "white" { }
        _TexA("Another Texture", 2D) = "black" { }
        _TexB("Yet Another Texture", 2D) = "" { }
        _TexC("One More Another Texture", 2D) = "" { }
    }

    SubShader {
        Pass {
            SetTexture[_MainTex] { combine texture }
            SetTexture[_TexA] { combine texture * previous }
            SetTexture[_TexB] { combine texture + previous }
            SetTexture[_TexC] { combine texture - previous }
        }
    }

    Fallback Off
}

此代码将为 _MainTex、_TexA、_TexB 和 _TexC 报告此错误。这似乎是一个错误。如何解决这个问题？

Answer 1

经过一些研究，我现在可以得出结论，我正在使用的着色器编译目标不支持三个以上的纹理。（不幸的是，我丢失了描述此限制的文档的 link。）

"Material doesn't have a ... property" 使用超过 3 个 2D 纹理时

"Material doesn't have a ... property" when using more than 3 2D Textures

shader

unity3d