public void SetPosition(Line2D line, Plane plane)
{
Line3D line3d = new Line3D(new Vector3D(line.v1, plane.GetZ(line.v1)), new Vector3D(line.v2, plane.GetZ(line.v2)));
// This vector is perpendicular to the line, with a 90° angle between it and the plane normal
Vector3D perpendicularvector = Vector3D.CrossProduct(line3d.GetDelta().GetNormal(), plane.Normal) * (-1);
// This vector is on the plane, with a 90° angle to the perpendicular vector (so effectively
// it's on the line, but in 3D
Vector3D linevector = Vector3D.CrossProduct(plane.Normal, perpendicularvector) * (-1);
Matrix m = Matrix.Null;
m.M11 = linevector.x;
m.M12 = linevector.y;
m.M13 = linevector.z;
m.M21 = perpendicularvector.x;
m.M22 = perpendicularvector.y;
m.M23 = perpendicularvector.z;
m.M31 = plane.Normal.x;
m.M32 = plane.Normal.y;
m.M33 = plane.Normal.z;
m.M44 = 1.0f;
// The matrix is at the 0,0 origin, so move it to the start vertex of the line
Vector3D tp = new Vector3D(line.v1, plane.GetZ(line.v1));
position = Matrix.Multiply(m, Matrix.Translation(RenderDevice.V3(tp)));
}
/// <summary>
/// This sets the position to use for the thing geometry.
/// </summary>
public void SetPosition(Vector3D pos)
{
position_v3 = RenderDevice.V3(pos); //mxd
position = Matrix.Translation(position_v3);
updategeo = true;
updatecage = true; //mxd
//mxd. update bounding box?
if (lightType != null && lightRadius > thing.Size)
{
UpdateBoundingBox(lightRadius, lightRadius * 2);
}
}
