在着色器中对立方体贴图数组进行采样

下面是一个使用立方体贴图数组的着色器示例。

Shader "CubemapArrayShaderExample" {
Properties {
    _MainTex ("CubemapArray", CubeArray) = "" {}
    _Mip ("Mip", Float) = 0.0
    _Intensity ("Intensity", Float) = 1.0
    _SliceIndex ("Slice", Int) = 0
    _Exposure ("Exposure", Float) = 0.0
}

SubShader {
    Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "ForceSupported" = "True"}

    Pass {

        CGPROGRAM
        #pragma vertex vert
            #pragma fragment frag
            #pragma require sampleLOD
            #pragma require cubearray
            #include "UnityCG.cginc"
    
    
    
            struct appdata {
                float4 pos : POSITION;
                float3 nor : NORMAL;
            };
    
            struct v2f {
                float3 uv : TEXCOORD0;
                float4 pos : SV_POSITION;
            };
    
            uniform int _SliceIndex;
            float _Mip;
            half _Alpha;
            half _Intensity;
            float _Exposure;
    
           v2f vert (appdata v) {
                v2f o;
                o.pos = UnityObjectToClipPos(v.pos);
                float3 viewDir = -normalize(ObjSpaceViewDir(v.pos));
                o.uv = reflect(viewDir, v.nor);
                return o;
            }
    
            half4 _MainTex_HDR;
            UNITY_DECLARE_TEXCUBEARRAY(_MainTex);
            fixed4 frag (v2f i) : COLOR0
            {
                fixed4 c = UNITY_SAMPLE_TEXCUBEARRAY(_MainTex, float4(i.uv, _SliceIndex));
                fixed4 cmip = UNITY_SAMPLE_TEXCUBEARRAY_LOD(_MainTex, float4(i.uv, _SliceIndex), _Mip);
                if (_Mip >= 0.0)
                    c = cmip;
                c.rgb = DecodeHDR (c, _MainTex_HDR) * _Intensity;
                c.rgb *= exp2(_Exposure);
                c = lerp (c, c.aaaa, _Alpha);
                return c;
            }
            ENDCG
        }
    }
    Fallback Off
}

如果将此着色器与在创建立方体贴图数组页面的示例中创建的立方体贴图数组一起使用，则结果将如下所示：