/// <summary>
/// builds a flattened 2D array of vertices like the following:
///
/// 15--16--17--18--19
/// | | | | |
/// 10--11--12--13--14
/// | | | | |
/// 5---6---7---8---9
/// | | | | |
/// 0---1---2---3---4
///
/// NOTE: <see cref="AddNeighbors"/> must be called after this method to
/// ensure that we properly detect the correct neighbors
/// </summary>
private void GenerateVertices()
{
// start from the passed in _bottomLeft Vector3 and build list of QuadVerts
int rows = Subdivisions + 2;
int cols = rows;
float colVertOffset = 0F;
float rowVertOffset = 0F;
colVertOffset = Size / (Subdivisions + 1F);
rowVertOffset = Size / (Subdivisions + 1F);
float uvScalar = 1 / (4 * Face.Size);
float xBottomLeftOffset = -Size / 2F;
float yBottomLeftOffset = -Size / 2F;
float zBottomLeftOffset = 0F;
Vector3 bottomLeftCorner = new Vector3(xBottomLeftOffset, yBottomLeftOffset, zBottomLeftOffset);
for (int row = 0; row < rows; row++)
{
for (int col = 0; col < cols; col++)
{
int index = FlatArray.GetIndexFromRowCol(row, col, cols);
Vector3 v = new Vector3((col * colVertOffset) + bottomLeftCorner.x, (row * rowVertOffset) + bottomLeftCorner.y, bottomLeftCorner.z);
if (index == 0)
{
BottomLeft = v.Clone();
}
if (index == FlatArray.GetBottomRightIndex(cols))
{
BottomRight = v.Clone();
}
if (index == FlatArray.GetTopLeftIndex(rows, cols))
{
TopLeft = v.Clone();
}
if (index == FlatArray.GetTopRightIndex(rows, cols))
{
TopRight = v.Clone();
}
Vector3 scaledUV = Face.ToLocalVert(ToWorldVert(v)) * uvScalar;
var uvOffset = Face.GetUVOffset();
Vector2 uv = new Vector2(uvOffset.x + scaledUV.x, uvOffset.y + scaledUV.y);
// set elevation
v = GetInverseOffsetFromRoot(Face.ApplyElevation(GetOffsetFromRoot(v), uv));
Vertices[index] = v;
UVs[index] = uv;
}
}
DistanceTestCentre = GetInverseOffsetFromRoot(Face.ApplyElevation(GetOffsetFromRoot(CentrePoint), Face.GetUVOffset()));
}
/// <summary>
/// draw a fan of triangles like the following, leaving edges empty
/// | | |
/// ---------
/// |\|/|
/// ---------
/// |/|\|
/// ---------
/// | | |
/// </summary>
private void GenerateCentreTriangles()
{
if (_centreTriangleCache == null)
{
List <int> tris = new List <int>();
int rows = _pointsOnSide - 4; // stop before last 2 rows of verts
int cols = rows; // stop before last 2 columns of verts
// skip the edge triangles as they are special case and just generate the centre triangle fans
for (int row = 2; row < rows; row += 2)
{
for (int col = 2; col < cols; col += 2)
{
tris.AddRange(GetTriangleFan(
FlatArray.GetIndexFromRowCol(row, col, _pointsOnSide),
true, true, true, true));
}
}
_centreTriangleCache = tris.ToArray();
}
}
private void GenerateCase(int caseId, bool topActive, bool bottomActive, bool leftActive, bool rightActive)
{
int rows = _pointsOnSide - 4;
int cols = _pointsOnSide - 4;
List <int> tris = new List <int>(_centreTriangleCache);
if (rows > 0)
{
// bottom left
tris.AddRange(GetTriangleFan(0, bottomActive, true, true, leftActive));
// bottom
for (int col = 2; col < cols; col += 2)
{
tris.AddRange(GetTriangleFan(col, bottomActive, true, true, true));
}
// bottom right
tris.AddRange(GetTriangleFan(_pointsOnSide - 3, bottomActive, rightActive, true, true));
// right
for (int row = 2; row < rows; row += 2)
{
tris.AddRange(GetTriangleFan(FlatArray.GetIndexFromRowCol(row, _pointsOnSide - 3, _pointsOnSide), true, rightActive, true, true));
}
// top right
tris.AddRange(GetTriangleFan(FlatArray.GetIndexFromRowCol(_pointsOnSide - 3, _pointsOnSide - 3, _pointsOnSide), true, rightActive, topActive, true));
// top
for (int col = 2; col < cols; col += 2)
{
tris.AddRange(GetTriangleFan(FlatArray.GetIndexFromRowCol(_pointsOnSide - 3, col, _pointsOnSide), true, true, topActive, true));
}
// top left
tris.AddRange(GetTriangleFan(FlatArray.GetIndexFromRowCol(_pointsOnSide - 3, 0, _pointsOnSide), true, true, topActive, leftActive));
// left
for (int row = 2; row < rows; row += 2)
{
tris.AddRange(GetTriangleFan(FlatArray.GetIndexFromRowCol(row, 0, _pointsOnSide), true, true, true, leftActive));
}
}
else if (rows == 0)
{
// bottom left
tris.AddRange(GetTriangleFan(0, bottomActive, true, true, leftActive));
// bottom right
tris.AddRange(GetTriangleFan(_pointsOnSide - 3, bottomActive, rightActive, true, true));
// top right
tris.AddRange(GetTriangleFan(FlatArray.GetIndexFromRowCol(_pointsOnSide - 3, _pointsOnSide - 3, _pointsOnSide), true, rightActive, topActive, true));
// top left
tris.AddRange(GetTriangleFan(FlatArray.GetIndexFromRowCol(_pointsOnSide - 3, 0, _pointsOnSide), true, true, topActive, leftActive));
}
else
{
tris.AddRange(GetTriangleFan(0, bottomActive, rightActive, topActive, leftActive));
}
_triangleCache[caseId] = tris.ToArray();
}