/// <summary>
/// Create a matrix given 4 vectors
/// </summary>
/// <param name="v1"></param>
/// <param name="v2"></param>
/// <param name="v3"></param>
/// <param name="v4"></param>
public ASMATRIX4(ASVECTOR4 v1, ASVECTOR4 v2, ASVECTOR4 v3, ASVECTOR4 v4)
{
Matrix[0] = v1;
Matrix[1] = v2;
Matrix[2] = v3;
Matrix[3] = v4;
}
/// <summary>
/// Builds an identity matrix and returns it to the caller
/// </summary>
/// <returns></returns>
public void CreateIdentityMatrix()
{
Matrix[0] = new ASVECTOR4(1, 0, 0, 0);
Matrix[1] = new ASVECTOR4(0, 1, 0, 0);
Matrix[2] = new ASVECTOR4(0, 0, 1, 0);
Matrix[3] = new ASVECTOR4(0, 0, 0, 1);
}
/// <summary>
/// Empty constructor to initialise the points structure to be all 0
/// </summary>
public ASFace()
{
for (var i = 0; i < 3; i++)
{
m_points[i] = new ASVECTOR4();
}
}
/// <summary>
/// Initialise a new vector with a vector
/// </summary>
/// <param name="vec"></param>
public ASVECTOR4(ASVECTOR4 vec)
{
Points[0] = vec.Points[0];
Points[1] = vec.Points[1];
Points[2] = vec.Points[2];
Points[3] = vec.Points[3];
}
// OPERATOR OVERLOADS
/// <summary>
/// Minus the components of vector A from vector B to get edge 3
/// </summary>
/// <param name="v1"></param>
/// <param name="v2"></param>
/// <returns></returns>
public static ASVECTOR4 operator -(ASVECTOR4 v1, ASVECTOR4 v2)
{
var newVec = new ASVECTOR4(v1.Points[0] - v2.Points[0], v1.Points[1] - v2.Points[1],
v1.Points[2] - v2.Points[2]);
return(newVec);
}
/// <summary>
/// Rescales the point to a valid unit so we can draw it to the screen
/// </summary>
/// <returns></returns>
public ASVECTOR4 Rescale()
{
var newPoint = new ASVECTOR4();
for (var i = 0; i < 4; i++)
{
newPoint.Points[i] = Points[i] / Points[3];
}
return(newPoint);
}
/// <summary>
/// Computes the normals for this face, these will be stored as
/// U, X, V in the vector, the W parameter will be 1 as we don't
/// have a ASVECTOR3 object (no need for it when we can just use VEC4)
/// </summary>
/// <returns></returns>
public ASVECTOR4 ComputeFaceNormals()
{
// Get the UV edges of our triangle, we can then calculate the face
// normals from these values.
var vecA = new ASVECTOR4();
vecA.Points[0] = m_points[0].Points[0] - m_points[1].Points[0];
vecA.Points[1] = m_points[0].Points[1] - m_points[1].Points[1];
vecA.Points[2] = m_points[0].Points[2] - m_points[1].Points[2];
var vecB = new ASVECTOR4();
vecB.Points[0] = m_points[1].Points[0] - m_points[2].Points[0];
vecB.Points[1] = m_points[1].Points[1] - m_points[2].Points[1];
vecB.Points[2] = m_points[1].Points[2] - m_points[2].Points[2];
// Get the cross product of the two vectors
var norm = (vecA * vecB).Normalise();
// Normalise the vector to get the unit lenght
return(norm);
}
/// <summary>
/// Creates a new ASFace array object to hold each point
/// </summary>
/// <param name="pointA"></param>
/// <param name="pointB"></param>
/// <param name="pointC"></param>
public ASFace(ASVECTOR4 pointA, ASVECTOR4 pointB, ASVECTOR4 pointC)
{
m_points[0] = pointA;
m_points[1] = pointB;
m_points[2] = pointC;
}
/// <summary>
/// Returns the product of vector A and B
/// </summary>
/// <param name="v"></param>
/// <returns></returns>
public double ScalarProduct(ASVECTOR4 v)
{
return(Points[0] * v.Points[0] + Points[1] * v.Points[1] + Points[2] * v.Points[2]);
}
/// <summary>
/// Multiplies the x,y,z components of vectors together
/// </summary>
/// <param name="vecB"></param>
public void MultiplyVector(ASVECTOR4 vecB)
{
Points[0] *= vecB.Points[0];
Points[1] *= vecB.Points[1];
Points[2] *= vecB.Points[2];
}
/// <summary>
/// Divides the x,y,z components of two vectors by eachother
/// </summary>
/// <param name="vecB"></param>
public void DivideVector(ASVECTOR4 vecB)
{
Points[0] /= vecB.Points[0];
Points[1] /= vecB.Points[1];
Points[2] /= vecB.Points[2];
}
/// <summary>
/// Substracts the x,y,z components of two vectors from one another
/// </summary>
/// <param name="vecB"></param>
public void MinusFromVector(ASVECTOR4 vecB)
{
Points[0] -= vecB.Points[0];
Points[1] -= vecB.Points[1];
Points[2] -= vecB.Points[2];
}
/// <summary>
/// Adds the x,y,z components of two vectors together
/// </summary>
/// <param name="vecB"></param>
public void AddToVector(ASVECTOR4 vecB)
{
Points[0] += vecB.Points[0];
Points[1] += vecB.Points[1];
Points[2] += vecB.Points[2];
}
