240 lines
9.1 KiB
HLSL
240 lines
9.1 KiB
HLSL
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struct Cube
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{
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float3 min;
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float3 max;
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};
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float random(in float3 st)
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{
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return frac(cos(dot(st.xyz, float3(12.9898, 78.233, 123.691))) * 43758.5453123);
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}
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float _TriToCube;
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float _SpawnAlpha;
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float3 _LocalSpawnOffset;
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float3 _WorldSpawnOffset;
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float _Pieces;
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int _AssemblyMode;
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float3 _AssemblyBegin;
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float3 _AssemblyEnd;
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int _ExplodeMode;
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float _ExplodeFadeDistance;
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void assembleVert(float3 newPos, v2f i, float2 newUV, float alpha, inout v2f o)
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{
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float3 worldPos = lerp(i.worldPos, newPos, alpha);
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o.uv = lerp(i.uv, newUV, _TriToCube);
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o.pos = UnityWorldToClipPos(float4(worldPos, 1));
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o.worldPos = float4(worldPos, 1);
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}
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[maxvertexcount(18)]
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void geom(triangle v2f IN[3], inout TriangleStream < v2f > tristream)
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{
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float3 edgeA = IN[1].localPos - IN[0].localPos;
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float3 edgeB = IN[2].localPos - IN[0].localPos;
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float3 c = cross(edgeA, edgeB);
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float3 outDir = normalize(c);
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float4 center = (IN[0].worldPos + IN[1].worldPos + IN[2].worldPos) / 3;
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float2 uv = (IN[0].uv + IN[1].uv + IN[2].uv) / 3;
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Cube cube;
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v2f o;
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float rando = random(float3(IN[0].vertexId, IN[1].vertexId, IN[2].vertexId));
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//center += rando/50;
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// Calculate Cube Bounds
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cube.min = IN[0].worldPos;
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cube.max = IN[0].worldPos;
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for (int i = 1; i < 3; i ++)
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{
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cube.min = float3(min(IN[i].worldPos.x, cube.min.x), min(IN[i].worldPos.y, cube.min.y), min(IN[i].worldPos.z, cube.min.z));
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cube.max = float3(max(IN[i].worldPos.x, cube.max.x), max(IN[i].worldPos.y, cube.max.y), max(IN[i].worldPos.z, cube.max.z));
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}
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cube.min = lerp(cube.min, center, rando / 20);
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cube.max = lerp(cube.max, center, rando / 20);
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float4 offset = 0;
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if (_ExplodeMode == 0)
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{
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offset = float4(_WorldSpawnOffset, 0) + mul(unity_ObjectToWorld, _LocalSpawnOffset);
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}
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else if(_ExplodeMode == 1)
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{
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offset = float4(outDir * _ExplodeFadeDistance, 0);
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}
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float4 cameraExplodeOffset = 0;
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float spawnAlpha = 0;
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if(_AssemblyMode == 0) // Random
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{
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spawnAlpha = saturate((-rando) * _Pieces + (_SpawnAlpha * (_Pieces + 1)));
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}
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else if (_AssemblyMode == 1) // Building Blocks
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{
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float lineMagnitude = distance(_AssemblyBegin, _AssemblyEnd);
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float3 constructionLine = (_AssemblyEnd - _AssemblyBegin);
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float3 objectLine = (mul(unity_WorldToObject, center) - _AssemblyBegin);
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float progress = -1 + saturate(dot(constructionLine, objectLine) / (lineMagnitude * lineMagnitude));
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IN[0].localPos.z = progress;
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IN[1].localPos.z = progress;
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IN[2].localPos.z = progress;
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spawnAlpha = saturate((progress) * _Pieces + (_SpawnAlpha * (_Pieces + 1)));
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}
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cube.min = lerp(cube.min, center + offset, spawnAlpha);
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cube.max = lerp(cube.max, center + offset, spawnAlpha);
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// Construct Cubes
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float3 normal = float3(0, 0, 1);
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o = IN[0];
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o.uv = lerp(o.uv, uv, _TriToCube);
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IN[0].worldPos = lerp(IN[0].worldPos, center + offset, spawnAlpha);
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IN[1].worldPos = lerp(IN[1].worldPos, center + offset, spawnAlpha);
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IN[2].worldPos = lerp(IN[2].worldPos, center + offset, spawnAlpha);
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if (_TriToCube == 0)
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{
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for (int i = 0; i < 3; i ++)
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{
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IN[i].pos = UnityWorldToClipPos(IN[i].worldPos);
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tristream.Append(IN[i]);
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}
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tristream.RestartStrip();
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return;
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}
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float3 viewDirection = normalize(center - getCameraPosition());
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//Front
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o.normal = float3(0, 0, 1);
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if (dot(viewDirection, o.normal) < 0)
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{
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assembleVert(float3(cube.min.x, cube.min.y, cube.max.z), IN[0], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.max.x, cube.min.y, cube.max.z), IN[1], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.min.x, cube.max.y, cube.max.z), IN[2], uv, _TriToCube, o);
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tristream.Append(o);
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tristream.RestartStrip();
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assembleVert(float3(cube.max.x, cube.max.y, cube.max.z), IN[0], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.min.x, cube.max.y, cube.max.z), IN[1], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.max.x, cube.min.y, cube.max.z), IN[2], uv, _TriToCube, o);
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tristream.Append(o);
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tristream.RestartStrip();
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}
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//Back
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o.normal = float3(0, 0, -1);
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if (dot(viewDirection, o.normal) < 0)
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{
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assembleVert(float3(cube.min.x, cube.max.y, cube.min.z), IN[0], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.max.x, cube.min.y, cube.min.z), IN[1], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.min.x, cube.min.y, cube.min.z), IN[2], uv, _TriToCube, o);
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tristream.Append(o);
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tristream.RestartStrip();
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assembleVert(float3(cube.max.x, cube.min.y, cube.min.z), IN[0], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.min.x, cube.max.y, cube.min.z), IN[1], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.max.x, cube.max.y, cube.min.z), IN[2], uv, _TriToCube, o);
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tristream.Append(o);
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tristream.RestartStrip();
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}
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//-x
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o.normal = float3(1, 0, 0);
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if (dot(viewDirection, o.normal) < 0)
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{
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assembleVert(float3(cube.max.x, cube.max.y, cube.min.z), IN[0], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.max.x, cube.min.y, cube.max.z), IN[1], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.max.x, cube.min.y, cube.min.z), IN[2], uv, _TriToCube, o);
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tristream.Append(o);
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tristream.RestartStrip();
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assembleVert(float3(cube.max.x, cube.min.y, cube.max.z), IN[0], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.max.x, cube.max.y, cube.min.z), IN[1], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.max.x, cube.max.y, cube.max.z), IN[2], uv, _TriToCube, o);
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tristream.Append(o);
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tristream.RestartStrip();
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}
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//+x
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o.normal = float3(-1, 0, 0);
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if (dot(viewDirection, o.normal) < 0)
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{
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assembleVert(float3(cube.min.x, cube.min.y, cube.min.z), IN[0], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.min.x, cube.min.y, cube.max.z), IN[1], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.min.x, cube.max.y, cube.min.z), IN[2], uv, _TriToCube, o);
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tristream.Append(o);
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tristream.RestartStrip();
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assembleVert(float3(cube.min.x, cube.max.y, cube.max.z), IN[0], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.min.x, cube.max.y, cube.min.z), IN[1], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.min.x, cube.min.y, cube.max.z), IN[2], uv, _TriToCube, o);
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tristream.Append(o);
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tristream.RestartStrip();
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}
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//up
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o.normal = float3(0, 1, 0);
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if (dot(viewDirection, o.normal) < 0)
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{
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assembleVert(float3(cube.min.x, cube.max.y, cube.max.z), IN[0], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.max.x, cube.max.y, cube.min.z), IN[1], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.min.x, cube.max.y, cube.min.z), IN[2], uv, _TriToCube, o);
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tristream.Append(o);
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tristream.RestartStrip();
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assembleVert(float3(cube.max.x, cube.max.y, cube.min.z), IN[0], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.min.x, cube.max.y, cube.max.z), IN[1], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.max.x, cube.max.y, cube.max.z), IN[2], uv, _TriToCube, o);
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tristream.Append(o);
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tristream.RestartStrip();
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}
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//down
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o.normal = float3(0, -1, 0);
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if (dot(viewDirection, o.normal) < 0)
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{
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assembleVert(float3(cube.min.x, cube.min.y, cube.min.z), IN[0], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.max.x, cube.min.y, cube.min.z), IN[1], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.min.x, cube.min.y, cube.max.z), IN[2], uv, _TriToCube, o);
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tristream.Append(o);
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tristream.RestartStrip();
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assembleVert(float3(cube.max.x, cube.min.y, cube.max.z), IN[0], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.min.x, cube.min.y, cube.max.z), IN[1], uv, _TriToCube, o);
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tristream.Append(o);
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assembleVert(float3(cube.max.x, cube.min.y, cube.min.z), IN[2], uv, _TriToCube, o);
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tristream.Append(o);
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tristream.RestartStrip();
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}
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/*
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for (int i = 0; i < 3; i ++)
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{
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IN[i].uv = uv;
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tristream.Append(IN[i]);
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}
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*/
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}
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