68 lines
2.3 KiB
Plaintext
68 lines
2.3 KiB
Plaintext
// Original code from https://gist.github.com/josephbk117/a43f5335cea9b3e12a44f196dc81f30f
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Shader "Custom/InteriorImposterShader"
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{
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Properties
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{
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}
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SubShader
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{
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "UnityCG.cginc"
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struct appdata
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{
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float4 vertex : POSITION;
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float3 normal : NORMAL;
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};
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struct v2f
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{
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float3 worldPos : TEXCOORD0;
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float3 worldNormal : TEXCOORD1;
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float4 pos : SV_POSITION;
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};
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v2f vert (appdata v)
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{
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v2f o;
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o.pos = UnityObjectToClipPos(v.vertex);
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o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
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o.worldNormal = UnityObjectToWorldNormal(v.normal);
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return o;
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}
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// ChatGPT snippet
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float3 BoxProjectReflectionDir(float3 worldPos, float3 worldRefl)
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{
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// Calculate relative position within the box
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float3 boxMin = unity_SpecCube0_BoxMin.xyz;
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float3 boxMax = unity_SpecCube0_BoxMax.xyz;
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float3 boxCenter = 0.5 * (boxMin + boxMax);
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float3 boxSize = boxMax - boxMin;
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float3 localPos = worldPos - boxCenter;
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float3 absLocalRefl = abs(worldRefl);
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// Scale the reflection vector based on which side of the box it hits
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float3 scale = boxSize / absLocalRefl;
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float scaleMin = min(min(scale.x, scale.y), scale.z);
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return localPos + worldRefl * scaleMin;
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}
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fixed4 frag (v2f i) : SV_Target
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{
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half3 worldViewDir = normalize(UnityWorldSpaceViewDir(i.worldPos)); // Direction of ray from the camera towards the object surface
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half4 skyData = UNITY_SAMPLE_TEXCUBE(unity_SpecCube0, BoxProjectReflectionDir(i.worldPos, -worldViewDir));
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half3 skyColor = DecodeHDR(skyData, unity_SpecCube0_HDR); // This is done becasue the cubemap is stored HDR
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return half4(skyColor, 1.0);
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}
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ENDCG
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}
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}
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}
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