public void CreateFromColumnsTest()
{
Vector3 column0 = new Vector3(1, 4, 7);
Vector3 column1 = new Vector3(2, 5, 8);
Vector3 column2 = new Vector3(3, 6, 9);
Matrix3x3 matrix = Matrix3x3.CreateFromColumns(column0, column1, column2);
float[] array = matrix.ToArray();
for (int i = 0; i < 9; i++)
{
Assert.AreEqual(array[i], (float)(i + 1));
}
Assert.AreEqual(column0, matrix.GetColumn(0));
Assert.AreEqual(column1, matrix.GetColumn(1));
Assert.AreEqual(column2, matrix.GetColumn(2));
Assert.ThrowsException <ArgumentException>(() =>
{
matrix.GetColumn(-1);
}
);
Assert.ThrowsException <ArgumentException>(() =>
{
matrix.GetColumn(3);
}
);
}
private Vector3 CalculateBarycentric(int x, int y, FilledTriangle triangle)
{
var d = new Vector3(x, y, 1);
var w = triangle.A.Determinant;
var wx = Matrix3x3.CreateFromColumns(d, triangle.VB, triangle.VC).Determinant;
var wy = Matrix3x3.CreateFromColumns(triangle.VA, d, triangle.VC).Determinant;
var wz = Matrix3x3.CreateFromColumns(triangle.VA, triangle.VB, d).Determinant;
var xA = wx / w;
var xB = wy / w;
var xC = wz / w;
return(new Vector3(xA, xB, xC));
}