Model to world Transformation 4 x 4

In lisp you could get the 4 x 4 model to world tranformation matrix for blocks using the "NENTSELP" command inside of lisp. How or can you get that same 4 x 4 matrix using VBA.

 

Since it's been a few days and no one has an answer for you, I just wanted
to follow up, since the geometry questions are the more interesting ones.
Are you intent on getting that matrix, or is your true goal to transform
something to/from the block's coordinate system, and this is just one way
that you're researching.


I'm sure you've seen that blockreferences have the following properties
which should fully define the transformation matrix. If you're trying to
transform coordinates from WCS into block OCS, though, it may be easier
(even if not as fun) to apply these as individual transforms than to come up
with the matrix.
InsertionPoint, Normal, Rotation,
XScaleFactor, YScaleFactor, ZScaleFactor

This thread may be helpful; Mr. Fleming seems to have this coded in LISP
already.
http://groups.google.com/groups?threadm=485DA4F61E38C602A006984F8E39FA80@in.
WebX.maYIadrTaRb

As usual, I like to jot down my Google searches to cut re-work:
http://groups.google.com/groups?q=create+transformation+matrix+autocad

HTH,

James

 

oops... I meant to draft the previous msg and not send it for a couple of
days, in case someone had a more helpful answer....

Another thought... How about using USER variables to save the matrix on the
LISP side (by sending LISP commands from VBA) and reading them on the VBA
side. It'd take four rounds, one for each row of the matrix, but it seems
straightforward. You can use "(handent)" and Object.Handle to tell LISP
which object you want to select.

James

 

Look at the GetSubEntity method of the Utilities object.


--
R. Robert Bell, MCSE
www.AcadX.com


| In lisp you could get the 4 x 4 model to world tranformation matrix for
blocks using the "NENTSELP" command inside of lisp. How or can you get that
same 4 x 4 matrix using VBA.