Sample a cubemap array in a shader
Sample a cubemap array in High-level Shader Language (HLSL).
Read time 1 minuteLast updated a month ago
Here is an example of a shader that uses a cubemap array.
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 { HLSLPROGRAM #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); half4 frag (v2f i) : COLOR0 { half4 c = UNITY_SAMPLE_TEXCUBEARRAY(_MainTex, float4(i.uv, _SliceIndex)); half4 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; } ENDHLSL } } Fallback Off}
If you use this shader with the Cubemap Array created in the example on the Create a cubemap array page, the result looks like this:
A sphere with the rainbow color pattern the shader draws.