You previously did:

Transformation t = new Transformation();

t.Translate(10, 0, 0);
t.Rotate(30, Vector3D.yAxis); // t now contains a combination of translation and rotation

Point3D p = new (10, 20, 30);

t.Apply(ref p); // transforms the point p

What you need to do in Eyeshot 2.0:

Translation tra = new Translation(10, 0, 0);

Rotation rot = new Rotation(Math.PI/6, Vector3D.yAxis); // angle in radians

Transformation combined = tra * rot; // combines the two transformations (order matters)

Point3D pt = new Point3D(10, 20, 30);

Point3D newPt = combined * p; // transforms the point pt

You previously did:

Dim t As Transformation = New Transformation()

t.Translate(10, 0, 0)
t.Rotate(30, Vector3D.yAxis) ' t now contains a combination of translation and rotation

Dim p As Point3D = New Point3D(10, 20, 30)

t.Apply(p) ' transforms the point p

What you need to do in Eyeshot 2.0:

Dim tra As Translation = New Translation(10, 0, 0)

Dim rot As Rotation = New Rotation(Math.PI/6, Vector3D.AxisY) ' angle in radians

Dim combined As Transformation = tra * rot ' combines the two transformations (order matters)

Dim pt As Point3D = New Point3D(10, 20, 30)

Dim newPt As Point3D = combined * p ' transforms the point pt