Created
May 4, 2018 19:27
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Experiment with "_WorldSpaceCameraPos" in Unity3D
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| // based on this shader (https://assetstore.unity.com/packages/vfx/shaders/gem-shader-3) | |
| // Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld' | |
| // Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)' | |
| Shader "FX/Gem_CameraSpace" | |
| { | |
| Properties { | |
| [HDR] _Color ("Color", Color) = (1,1,1,1) | |
| _ReflectionStrength ("Reflection Strength", Range(0.0,2.0)) = 1.0 | |
| _EnvironmentLight ("Environment Light", Range(0.0,2.0)) = 1.0 | |
| _Emission ("Emission", Range(0.0,2.0)) = 0.0 | |
| [NoScaleOffset] _RefractTex ("Refraction Texture", Cube) = "" {} | |
| _Alpha ("Gem Alpha", Range(0.0, 1.0)) = 1.0 | |
| _Distance ("Gem Scale", Float) = 50.0 | |
| } | |
| SubShader { | |
| Tags { | |
| "Queue" = "Transparent" | |
| } | |
| // First pass - here we render the backfaces of the diamonds. Since those diamonds are more-or-less | |
| // convex objects, this is effectively rendering the inside of them. | |
| Pass { | |
| Cull Front | |
| Blend SrcAlpha OneMinusSrcAlpha | |
| ZWrite On//Off | |
| CGPROGRAM | |
| #pragma vertex vert | |
| #pragma fragment frag | |
| #include "UnityCG.cginc" | |
| struct v2f { | |
| float4 pos : SV_POSITION; | |
| float3 uv : TEXCOORD0; | |
| float3 worldPos : TEXCOORD1; | |
| }; | |
| v2f vert (float4 v : POSITION, float3 n : NORMAL) | |
| { | |
| v2f o; | |
| o.pos = UnityObjectToClipPos(v); | |
| o.worldPos = mul(unity_ObjectToWorld, v).xyz; | |
| // TexGen CubeReflect: | |
| // reflect view direction along the normal, in view space. | |
| float3 viewDir = normalize(ObjSpaceViewDir(v)); | |
| o.uv = -reflect(viewDir, n); | |
| o.uv = mul(unity_ObjectToWorld, float4(o.uv,0)); | |
| return o; | |
| } | |
| fixed4 _Color; | |
| samplerCUBE _RefractTex; | |
| half _EnvironmentLight; | |
| half _Emission; | |
| // alpha channel hack | |
| float _Alpha; | |
| float _Distance; | |
| half4 frag (v2f i) : SV_Target | |
| { | |
| float distance = length(i.worldPos.xyz - _WorldSpaceCameraPos.xyz) / _Distance; | |
| _EnvironmentLight = (distance > 1.5) ? 1.5 : distance; | |
| half3 refraction = texCUBE(_RefractTex, i.uv).rgb * _Color.rgb; | |
| half4 reflection = UNITY_SAMPLE_TEXCUBE(unity_SpecCube0, i.uv); | |
| reflection.rgb = DecodeHDR (reflection, unity_SpecCube0_HDR); | |
| half3 multiplier = reflection.rgb * _EnvironmentLight + _Emission; | |
| //return half4(refraction.rgb * multiplier.rgb, 1.0f); | |
| half4 BeforeAlphaCalcColor = half4(refraction.rgb * multiplier.rgb, 1.0f); | |
| _Alpha = (distance > 1.0) ? 1.0 : distance; | |
| BeforeAlphaCalcColor.a = _Alpha; | |
| return BeforeAlphaCalcColor; | |
| } | |
| ENDCG | |
| } | |
| // Second pass - here we render the front faces of the diamonds. | |
| Pass { | |
| ZWrite On | |
| Blend One One | |
| CGPROGRAM | |
| #pragma vertex vert | |
| #pragma fragment frag | |
| #include "UnityCG.cginc" | |
| struct v2f { | |
| float4 pos : SV_POSITION; | |
| float3 uv : TEXCOORD0; | |
| half fresnel : TEXCOORD1; | |
| float3 worldPos : TEXCOORD2; | |
| }; | |
| v2f vert (float4 v : POSITION, float3 n : NORMAL) | |
| { | |
| v2f o; | |
| o.pos = UnityObjectToClipPos(v); | |
| o.worldPos = mul(unity_ObjectToWorld, v).xyz; | |
| // TexGen CubeReflect: | |
| // reflect view direction along the normal, in view space. | |
| float3 viewDir = normalize(ObjSpaceViewDir(v)); | |
| o.uv = -reflect(viewDir, n); | |
| o.uv = mul(unity_ObjectToWorld, float4(o.uv,0)); | |
| o.fresnel = 1.0 - saturate(dot(n,viewDir)); | |
| return o; | |
| } | |
| fixed4 _Color; | |
| samplerCUBE _RefractTex; | |
| half _ReflectionStrength; | |
| half _EnvironmentLight; | |
| half _Emission; | |
| float _Distance; | |
| half4 frag (v2f i) : SV_Target | |
| { | |
| float distance = length(i.worldPos.xyz - _WorldSpaceCameraPos.xyz) / _Distance; | |
| _EnvironmentLight = (distance > 1.5) ? 1.5 : distance; | |
| _ReflectionStrength = (distance > 1.0) ? 1.0 : distance; | |
| half3 refraction = texCUBE(_RefractTex, i.uv).rgb * _Color.rgb; | |
| half4 reflection = UNITY_SAMPLE_TEXCUBE(unity_SpecCube0, i.uv); | |
| reflection.rgb = DecodeHDR (reflection, unity_SpecCube0_HDR); | |
| half3 reflection2 = reflection * _ReflectionStrength * i.fresnel; | |
| half3 multiplier = reflection.rgb * _EnvironmentLight + _Emission; | |
| return fixed4(reflection2 + refraction.rgb * multiplier, 1.0f); | |
| } | |
| ENDCG | |
| } | |
| // Shadow casting & depth texture support -- so that gems can | |
| // cast shadows | |
| UsePass "VertexLit/SHADOWCASTER" | |
| } | |
| } |
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