/// <summary>
/// Create a Vector3 for the point specified by a given co-ordinate.
///
/// This function will also translate the point as necessary to ensure
/// that the landscape is symmetric about the origin.
///
/// Assuming that the height translates to the y-value.
/// </summary>
/// <param name="coord"></param>
/// <returns></returns>
private Vector3 getVector(Tuple coord)
{
return new Vector3(
coord.i - (size / 2),
heightMap[coord.i, coord.j],
coord.j - (size / 2)
);
}
/// <summary>
/// Does the given tuple specify a valid (i, j) co-ordinate for the
/// current height map?
/// </summary>
private bool validCoord(Tuple coord)
{
return coord.i >= 0 && coord.i < size &&
coord.j >= 0 && coord.j < size;
}
/// <summary>
/// Generate the two triangles that describe the square whose bottom-left corner is the given coordinate.
/// </summary>
/// <param name="coord">The coordinates of the bottom-left corner of the square.</param>
/// <returns></returns>
private Vector3[] getTriangleVertices(Tuple coord)
{
// if the bottom-left coordinate is at the right or top borders, then there are no triangles here
if(coord.i == size - 1 || coord.j == size - 1)
{
// return an empty array
return new Vector3[0];
}
// otherwise, return vertices for the two triangles within that square
return new Vector3[] {
// the first (upper) triangle
getVector(new Tuple(coord.i, coord.j)),
getVector(new Tuple(coord.i, coord.j + 1)),
getVector(new Tuple(coord.i + 1, coord.j + 1)),
// the second (lower) triangle
getVector(new Tuple(coord.i, coord.j)),
getVector(new Tuple(coord.i + 1, coord.j + 1)),
getVector(new Tuple(coord.i + 1, coord.j))
};
}