static int ComputeConfiguration(WallGrid grid, int x, int y)
{
byte botLeft = grid[x, y];
byte botRight = grid[x + 1, y];
byte topRight = grid[x + 1, y + 1];
byte topLeft = grid[x, y + 1];
return(MarchingSquares.ComputeConfiguration(botLeft, botRight, topRight, topLeft));
}
void TriangulateSquare(int x, int y)
{
int configuration = ComputeConfiguration(grid, x, y);
if (configuration != 0)
{
int[] points = MarchingSquares.GetPoints(configuration);
SetVertexIndices(points, x, y);
AddTriangles(points.Length);
}
}
/// <summary>
/// Does the cave produced by this grid contain a floor at these world coordinates?
/// </summary>
public bool IsFloor(float x, float z)
{
if (x <= 0 || z <= 0 || xMax <= x || zMax <= z)
{
return(false);
}
x *= scaleReciprocal;
z *= scaleReciprocal;
int gridX = (int)x;
int gridZ = (int)z;
float fractionalX = x - gridX;
float fractionalZ = z - gridZ;
byte botLeft = grid[gridX, gridZ];
byte botRight = grid[gridX + 1, gridZ];
byte topRight = grid[gridX + 1, gridZ + 1];
byte topLeft = grid[gridX, gridZ + 1];
int configuration = MarchingSquares.ComputeConfiguration(botLeft, botRight, topRight, topLeft);
return(!MarchingSquares.IntersectsTriangle(new Vector2(fractionalX, fractionalZ), configuration));
}