97 lines
2.8 KiB
JavaScript
97 lines
2.8 KiB
JavaScript
export const Region =
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{
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I(inX, inY, inZ)
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{
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return inX + inY*16 + inZ*256;
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},
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XYZ(inI)
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{
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let zWhole = Math.floor(inI / 256);
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let zPart = inI % 256;
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let yWhole = Math.floor(zPart / 16);
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let yPart = zPart % 16;
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return [yPart, yWhole, zWhole];
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},
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Surface(inVoxels)
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{
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function Vert(a)
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{
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var vertPointer = voxPointVert[a]
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if(vertPointer === undefined)
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{
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let vert = Region.XYZ(a);
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vertPointer = vertices.length;
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voxPointVert[a] = vertPointer;
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vertPointNeighbors.push([]);
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vertices.push(vert);
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}
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return vertPointer;
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}
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function Face(a, b, c, d)
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{
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let p1 = Vert(a);
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let p2 = Vert(b);
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let p3 = Vert(c);
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let p4 = Vert(d);
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triPointVert.push(p1, p2, p3, p3, p4, p1);
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vertPointNeighbors[p1].push(p2);
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vertPointNeighbors[p2].push(p1);
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vertPointNeighbors[p2].push(p3);
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vertPointNeighbors[p3].push(p2);
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vertPointNeighbors[p3].push(p4);
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vertPointNeighbors[p4].push(p3);
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vertPointNeighbors[p4].push(p1);
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vertPointNeighbors[p1].push(p2);
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}
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var vertices = [];
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var voxPointVert = [];
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var triPointVert = [];
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var vertPointNeighbors = [];
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var i;
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var BA, BU, BC, BR, TA, TU, TC, TR, CL, CD, CB;
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for(i=0; i<inVoxels.length; i++)
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{
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if(inVoxels[i])
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{
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let [x, y, z] = Region.XYZ(i);
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console.log("at", x, y, z);
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// bottom: at, "up", corner, right
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BA = i;
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BU = Region.I(x, y+1, z );
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BC = Region.I(x+1, y+1, z );
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BR = Region.I(x+1, y, z );
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// top: at, "up" corner, right
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TA = Region.I(x, y, z+1);
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TU = Region.I(x, y+1, z+1);
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TC = Region.I(x+1, y+1, z+1);
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TR = Region.I(x+1, y, z+1);
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// check: left, "down", below
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CL = Region.I(x-1, y, z );
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CD = Region.I(x, y-1, z );
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CB = Region.I(x, y, z-1);
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if(!inVoxels[BU]){ Face(BU, BC, TC, TU); }
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if(!inVoxels[BR]){ Face(BC, BR, TR, TC); }
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if(!inVoxels[TA]){ Face(TA, TU, TC, TR); }
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if(!inVoxels[CL]){ Face(BA, BU, TU, TA); }
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if(!inVoxels[CD]){ Face(BR, BA, TA, TR); }
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if(!inVoxels[CB]){ Face(BA, BU, BC, BR); }
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}
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}
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return {vert:new Float32Array(vertices.flat()), voxPointVert, triPointVert, vertPointNeighbors};
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}
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};
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