// build the "physical" mesh for display
// build the "physical" mesh for display
public static Node[] BuildWorld(int sideLength, out TriangleGrid[] segment)
{
Node[] map;
// make twenty segments, which are each a grid of triangles
segment = new TriangleGrid[20];
// this part is somewhat complicated
// luckily there are 'only' 20 of them
segment[0] = new TriangleGrid(sideLength);
segment[1] = new TriangleGrid(sideLength, rightEdge: segment[0].LeftEdge(), startIndex: segment[0].lastVertex);
segment[2] = new TriangleGrid(sideLength, rightEdge: segment[1].LeftEdge(), startIndex: segment[1].lastVertex);
segment[3] = new TriangleGrid(sideLength, rightEdge: segment[2].LeftEdge(), startIndex: segment[2].lastVertex);
segment[4] = new TriangleGrid(sideLength, rightEdge: segment[3].LeftEdge(), leftEdge: segment[0].RightEdge(), startIndex: segment[3].lastVertex);
// middle segment
segment[5] = new TriangleGrid(sideLength, bottomEdge: Reversed(segment[4].BottomEdge()), startIndex: segment[4].lastVertex);
segment[6] = new TriangleGrid(sideLength, bottomEdge: Reversed(segment[3].BottomEdge()), startIndex: segment[5].lastVertex);
segment[7] = new TriangleGrid(sideLength, bottomEdge: Reversed(segment[2].BottomEdge()), startIndex: segment[6].lastVertex);
segment[8] = new TriangleGrid(sideLength, bottomEdge: Reversed(segment[1].BottomEdge()), startIndex: segment[7].lastVertex);
segment[9] = new TriangleGrid(sideLength, bottomEdge: Reversed(segment[0].BottomEdge()), startIndex: segment[8].lastVertex);
// second middle segment
segment[10] = new TriangleGrid(sideLength, rightEdge: segment[5].LeftEdge(),
bottomEdge: Reversed(segment[6].RightEdge()), startIndex: segment[9].lastVertex);
segment[11] = new TriangleGrid(sideLength, rightEdge: segment[6].LeftEdge(),
bottomEdge: Reversed(segment[7].RightEdge()), startIndex: segment[10].lastVertex);
segment[12] = new TriangleGrid(sideLength, rightEdge: segment[7].LeftEdge(),
bottomEdge: Reversed(segment[8].RightEdge()), startIndex: segment[11].lastVertex);
segment[13] = new TriangleGrid(sideLength, rightEdge: segment[8].LeftEdge(),
bottomEdge: Reversed(segment[9].RightEdge()), startIndex: segment[12].lastVertex);
segment[14] = new TriangleGrid(sideLength, rightEdge: segment[9].LeftEdge(),
bottomEdge: Reversed(segment[5].RightEdge()), startIndex: segment[13].lastVertex);
// bottom segment
segment[15] = new TriangleGrid(sideLength, leftEdge: Reversed(segment[10].LeftEdge()), startIndex: segment[14].lastVertex);
segment[16] = new TriangleGrid(sideLength, leftEdge: Reversed(segment[11].LeftEdge()),
bottomEdge: Reversed(segment[15].RightEdge()), startIndex: segment[15].lastVertex);
segment[17] = new TriangleGrid(sideLength, leftEdge: Reversed(segment[12].LeftEdge()),
bottomEdge: Reversed(segment[16].RightEdge()), startIndex: segment[16].lastVertex);
segment[18] = new TriangleGrid(sideLength, leftEdge: Reversed(segment[13].LeftEdge()),
bottomEdge: Reversed(segment[17].RightEdge()), startIndex: segment[17].lastVertex);
segment[19] = new TriangleGrid(sideLength, leftEdge: Reversed(segment[14].LeftEdge()),
rightEdge: Reversed(segment[15].BottomEdge()), bottomEdge: Reversed(segment[18].RightEdge()),
startIndex: segment[18].lastVertex);
for (int n = 0; n < 20; n++)
{
segment[n].index = n;
}
// how many is that?
int totalVertices = segment[19].lastVertex;
map = new Node[totalVertices];
// assemble mesh- and map-vertices together into single arrays
for (int i = 0; i < 20; i++)
{
foreach (Node n in segment[i].nodes)
{
// map vertex. there's a one-to-one correspondence
map[n.index] = n;
}
}
// put the triangles together as well
List <int> mapTriangles = new List <int>();
for (int i = 0; i < 20; i++)
{
mapTriangles.AddRange(segment[i].triangles);
}
return(map);
}
public TriangleGrid[] Split(int subGrids = 1)
{
// the grid needs to divide correctly for this to work
if (vertsPerSide % subGrids != 1)
{
return(null);
}
int i = 0;
TriangleGrid[] subs = new TriangleGrid[subGrids * subGrids];
// split into multiple grids
int vertsPerSub = vertsPerSide / subGrids;
for (int x = 0; x < subGrids; x++)
{
for (int y = 0; y <= x; y++)
{
// x2 and y2 are the coordinates within the sub-grid
int x2 = 0, y2 = 0;
// x1 and y1 are coordinates within the major grid,
// while x and y designate the current sub-grid
int z = 0;
// z is the index of the current mapvertex within the sub-grid
// here we construct a sub-grid, which will become a map region
subs[i] = new TriangleGrid(vertsPerSub + 1);
for (int x1 = x * vertsPerSub; x1 <= (x + 1) * vertsPerSub; x1++)
{
for (int y1 = y * vertsPerSub; y1 <= y * vertsPerSub + x2; y1++)
{
// this works for "up-facing" grid segments
subs[i].nodes[z] = nodes[IndexOf(x1, y1)];
// add any triangles connected to this vertex
// any triangles that should be anchored here
if (y2 > 0)
{
// one triangle
subs[i].triangles.Add(z);
subs[i].triangles.Add(z - x2 - 1);
subs[i].triangles.Add(z - 1);
// in most cases, there are two triangles per vertex
// but if it's on the right edge, where y = x, there's only one
if (x2 > y2)
{
// another one
subs[i].triangles.Add(z);
subs[i].triangles.Add(z - x2);
subs[i].triangles.Add(z - x2 - 1);
}
}
// increment mapvertex index
z += 1;
// increment y coordinate
y2 += 1;
}
x2 += 1;
y2 = 0;
}
// count last index
subs[i].lastVertex = z - 1;
// increment sub-grid index
i += 1;
if (y < x)
{
// here we'll do a "down pointing" region
// again, x2 and y2 are the coordinates within the sub-grid
x2 = 0; y2 = 0;
// x1 and y1 are coordinates within the major grid,
// while x and y designate the current sub-grid
z = 0;
// and z is the index of the current mapvertex within the sub-grid
// initialize sub-grid
subs[i] = new TriangleGrid(vertsPerSub + 1);
for (int x1 = x * vertsPerSub; x1 <= (x + 1) * vertsPerSub; x1++)
{
for (int y1 = y * vertsPerSub + x2; y1 <= (y + 1) * vertsPerSub; y1++)
{
subs[i].nodes[z] = nodes[IndexOf(x1, y1)];
// add any triangles connected to this vertex
// any triangles that should be anchored here
if (x2 > 0)
{
// one triangle
subs[i].triangles.Add(z);
subs[i].triangles.Add(z - vertsPerSub + x2 - 1);
subs[i].triangles.Add(z - vertsPerSub + x2 - 2);
// do a second triangle sometimes
if (y2 > 0)
{
subs[i].triangles.Add(z);
subs[i].triangles.Add(z - vertsPerSub + x2 - 2);
subs[i].triangles.Add(z - 1);
}
}
// increment mapvertex index
z += 1;
// increment y coordinate
y2 += 1;
}
x2 += 1;
y2 = 0;
}
// count last index
subs[i].lastVertex = z - 1;
// increment sub-grid index
i += 1;
}
}
}
return(subs);
}
