public static RtTuple Subtract(RtTuple a, RtTuple b)
{
return(new RtTuple(a.X - b.X,
a.Y - b.Y,
a.Z - b.Z,
a.W - b.W));
}
public RtTuple Add(RtTuple addTuple)
{
return(new RtTuple(this.X + addTuple.X,
this.Y + addTuple.Y,
this.Z + addTuple.Z,
this.W + addTuple.W));
}
public RtTuple Multiply(RtTuple tuple)
{
var result = new double[RowCount];
var tupleValues = tuple.AsArray();
for (var row = 0; row < this.RowCount; row++)
{
double rowValue = 0;
for (var col = 0; col < this.ColCount; col++)
{
rowValue += Get(row, col) * tupleValues[col];
}
result[row] = rowValue;
}
return(new RtTuple(result[0], result[1], result[2], result[3]));
}
public RtTuple Negate()
{
var zeroTuple = new RtTuple(0, 0, 0, 0);
return(zeroTuple.Subtract(this));
}
public RtTuple Subtract(RtTuple subTuple)
{
return(Subtract(this, subTuple));
}
public RtTuple Cross(RtTuple other)
{
return(new Vector(Y * other.Z - Z * other.Y,
Z * other.X - X * other.Z,
X * other.Y - Y * other.X));
}
public double Dot(RtTuple other)
{
return((X * other.X) + (Y * other.Y) + (Z * other.Z) + (W * other.W));
}