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przemyslawzaworskiprzemyslawzaworski
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‎volumetric_bunny.shader

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//source: https://www.shadertoy.com/view/ls2BRt
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//In Unity3D editor, add quad to Main Camera. Bind material with shader to the quad. Set quad position at (0.0,0.0,0.4) and camera position at (0.0,0.0,0.0). Play.
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Shader "Volumetric Bunny"
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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 vertex_shader
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#pragma fragment pixel_shader
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#pragma target 5.0
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static const uint packedBunny[1024] =
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{0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,917504u,917504u,917504u,0u,0u,0u,0u,0u,0u,0u,0u,
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0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,1966080u,12531712u,16742400u,16742400u,
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16723968u,16711680u,8323072u,4128768u,2031616u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,
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0u,0u,0u,0u,6144u,2063360u,16776704u,33553920u,33553920u,33553920u,33553920u,33520640u,16711680u,
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8323072u,8323072u,2031616u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,268435456u,402653184u,134217728u,201326592u,
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67108864u,0u,0u,7168u,2031104u,16776960u,33554176u,33554176u,33554304u,33554176u,33554176u,33554176u,
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33553920u,16744448u,8323072u,4128768u,1572864u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,805306368u,939524096u,402653184u,
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0u,805306368u,1056964608u,1056964608u,528482304u,528482304u,260046848u,260046848u,260046848u,130039296u,
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8330240u,4128768u,393216u,0u,0u,0u,0u,0u,0u,0u,0u,939524096u,1040187392u,1040187392u,520093696u,251658240u,
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251658240u,260046848u,125829120u,125829120u,130088704u,63045504u,33554375u,33554375u,33554375u,33554407u,
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33554407u,33554370u,33554370u,33554374u,33554310u,16776966u,4144642u,917504u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,
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0u,0u,0u,0u,0u,0u,15360u,130816u,262017u,4194247u,33554383u,67108847u,33554415u,33554407u,33554407u,33554375u,
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33554375u,33554318u,2031502u,32262u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,31744u,130816u,262019u,
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2097151u,134217727u,134217727u,67108863u,33554415u,33554407u,33554415u,33554383u,2097102u,982926u,32262u,0u,0u,
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0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,31744u,130816u,524263u,117964799u,127926271u,134217727u,67108863u,
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16777215u,4194303u,4194303u,2097151u,1048574u,65422u,16134u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,
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3u,31751u,130951u,524287u,252182527u,261095423u,261095423u,59768830u,2097150u,1048574u,1048575u,262143u,131070u,
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65534u,16134u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,7u,31751u,130959u,503840767u,520617982u,
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529530879u,261095423u,1048575u,1048574u,1048574u,524286u,524287u,131070u,65534u,16134u,0u,0u,0u,0u,0u,0u,0u,0u,
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0u,0u,0u,0u,0u,0u,0u,0u,3u,1799u,32527u,134348750u,1040449534u,1057488894u,520617982u,51380223u,1048575u,1048575u,
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524287u,524287u,524287u,131070u,65534u,15886u,6u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,1536u,3968u,8175u,
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65535u,1006764030u,1040449534u,1057488894u,50855934u,524286u,524286u,524287u,524287u,524286u,262142u,131070u,
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65534u,32270u,14u,6u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,3968u,8160u,8191u,805371903u,2080505854u,2114191358u,
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101187582u,34078718u,524286u,524286u,524286u,524286u,524286u,524286u,262142u,131070u,32766u,8078u,3590u,0u,0u,0u,
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0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,8128u,8176u,16383u,2013331455u,2080505854u,235143166u,101187582u,524286u,1048574u,
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1048574u,1048574u,1048574u,524286u,524286u,262142u,131070u,32766u,16382u,8070u,1024u,0u,0u,0u,0u,0u,0u,0u,0u,0u,
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0u,0u,0u,8160u,8184u,1879064574u,2013331455u,470024190u,67371006u,524286u,1048574u,1048574u,1048574u,1048574u,
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1048574u,1048574u,524286u,524286u,262142u,65534u,16382u,8160u,1024u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,8128u,
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8184u,805322750u,402718719u,134479870u,524286u,524286u,1048574u,1048574u,1048574u,1048574u,1048574u,1048574u,
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1048574u,524286u,262142u,65534u,16382u,16368u,1792u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,3968u,8184u,16382u,131071u,
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262142u,524286u,1048574u,1048574u,1048574u,1048574u,1048574u,1048574u,1048574u,1048574u,524286u,262142u,65534u,
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16382u,16368u,1792u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,1792u,8184u,16380u,65535u,262143u,524286u,524286u,
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1048574u,1048574u,1048575u,1048574u,1048574u,1048574u,1048574u,524286u,262142u,65534u,16376u,16368u,1792u,0u,
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0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,8176u,16376u,32767u,262143u,524286u,1048574u,1048574u,1048575u,1048575u,
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1048575u,1048575u,1048574u,1048574u,524286u,262142u,32766u,16376u,8176u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,
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0u,0u,4032u,8184u,32766u,262142u,524286u,524286u,1048575u,1048574u,1048574u,1048574u,1048574u,1048574u,
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1048574u,524286u,262142u,32766u,16376u,8176u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,384u,8184u,32766u,
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131070u,262142u,524286u,1048575u,1048574u,1048574u,1048574u,1048574u,1048574u,524286u,524286u,131070u,32766u,
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16368u,1920u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,4080u,32764u,65534u,262142u,524286u,524286u,524286u,
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1048574u,1048574u,524286u,524286u,524286u,262142u,131070u,32764u,8160u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,
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0u,0u,0u,256u,16376u,32760u,131068u,262140u,262142u,524286u,524286u,524286u,524286u,524286u,262142u,131070u,65532u,
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16368u,3840u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,3968u,32752u,65528u,131068u,262142u,262142u,
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262142u,262142u,262142u,262142u,262140u,131064u,32752u,7936u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,
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0u,0u,0u,8064u,32736u,65528u,131070u,131070u,131070u,131070u,131070u,131070u,65532u,32752u,8160u,0u,0u,0u,0u,
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0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,3456u,16376u,32764u,65534u,65534u,65534u,32766u,32764u,16380u,
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4048u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,48u,2680u,8188u,8188u,8188u,8188u,4092u,
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120u,16u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,120u,248u,508u,508u,508u,248u,
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240u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,96u,240u,504u,504u,504u,240u,96u,
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0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,0u,224u,224u,224u,0u,0u,0u,0u,0u,
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0u,0u,0u,0u,0u,0u,0u,0u,0u,0u};
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float voxelB(float x,float y,float z)
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{
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return float((packedBunny[int(x)+int(y)*32 ] >> int(z) ) % 2u );
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}
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#define rot(a) float2x2(cos(a),-sin(a),sin(a),cos(a))
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float voxel(float x, float y, float z)
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{
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int ix = int(x), iy = int(y), iz = int(z);
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if (min(ix,min(iy,iz)) < 0 || max(ix,max(iy,iz)) > 30 ) return 0.0;
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return lerp( lerp( lerp( voxelB(ix,iy ,iz ), voxelB(ix+1,iy,iz), frac(x)),
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lerp( voxelB(ix,iy+1,iz ), voxelB(ix+1,iy+1,iz ), frac(x) ), frac(y)),
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lerp( lerp( voxelB(ix,iy ,iz+1), voxelB(ix+1,iy ,iz+1), frac(x)),
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lerp( voxelB(ix,iy+1,iz+1),voxelB(ix+1,iy+1,iz+1),frac(x)),frac(y)),frac(z));
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}
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float4 vertex_shader (float4 vertex : POSITION) : SV_POSITION
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{
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return UnityObjectToClipPos (vertex);
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}
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float4 pixel_shader (float4 vertex:SV_POSITION) : SV_TARGET
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{
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float2 V = 1.7* ((2.0*vertex.xy - _ScreenParams.xy) / _ScreenParams.y);
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float4 O = float4(0,0,0,0);
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for (float i=-1.; i<1.; i+=1./16.)
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{
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float3 P = float3( V, i);
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P.yz = mul(rot(.78),P.yz);
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P.xz = mul(rot(-_Time.g),P.xz);
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float3 A = abs(P);
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if (max(A.x,max(A.y,A.z))>1.) continue;
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P = 16.*(P+1.);
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O +=(1.-O.a)*voxel(P.x,P.z,P.y)*float4(float3(.5-.5*i,.5-.5*i,.5-.5*i),1);
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}
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return O;
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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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