以下是一些UnityShader变体优化的实践案例：案例一：材质纹理切换原始实现：#ifUSE_TEXTURE1sampler2Dtex1;#elsesampler2Dtex2;#endifvoidmain(){#ifUSE_TEXTURE1color=tex2D(tex1,uv);#elsecolor=tex2D(tex2,uv);