public HitLine3D(Vertex3D v1, Vertex3D v2, ItemType itemType, IItem item) : base(new Vertex2D(), itemType, item)
{
var vLine = v2.Clone().Sub(v1);
vLine.Normalize();
// Axis of rotation to make 3D cylinder a cylinder along the z-axis
var transAxis = new Vertex3D(vLine.Y, -vLine.X, 0);
var l = transAxis.LengthSq();
if (l <= 1e-6)
{
// line already points in z axis?
transAxis.Set(1, 0, 0); // choose arbitrary rotation vector
}
else
{
transAxis.DivideScalar(MathF.Sqrt(l));
}
// Angle to rotate the line into the z-axis
var dot = vLine.Z; //vLine.Dot(&vup);
Matrix.RotationAroundAxis(transAxis, -MathF.Sqrt(1 - dot * dot), dot);
var vTrans1 = v1.Clone().ApplyMatrix2D(Matrix);
var vTrans2 = v2.Clone().ApplyMatrix2D(Matrix);
var vTrans2Z = vTrans2.Z;
// set up HitLineZ parameters
Xy.Set(vTrans1.X, vTrans1.Y);
ZLow = MathF.Min(vTrans1.Z, vTrans2Z);
ZHigh = MathF.Max(vTrans1.Z, vTrans2Z);
V1 = v1;
V2 = v2;
HitBBox.Left = MathF.Min(v1.X, v2.X);
HitBBox.Right = MathF.Max(v1.X, v2.X);
HitBBox.Top = MathF.Min(v1.Y, v2.Y);
HitBBox.Bottom = MathF.Max(v1.Y, v2.Y);
HitBBox.ZLow = MathF.Min(v1.Z, v2.Z);
HitBBox.ZHigh = MathF.Max(v1.Z, v2.Z);
}