algorithmic modeling for Rhino

Extract transformation matrix from existing object

I'm mapping geometry from other software to Rhino and the other way around.

I wonder how to get from a python component the existing transformation matrix of a already created object (mesh and Brep). I mean it referenced to the world reference frame.

Thanks in advance

Replies to This Discussion

Permalink Reply by peter fotiadis on February 26, 2016 at 11:14pm

You mean using the RhinoObject.GetDynamicTransform Method? (same for InstanceObject)

Permalink Reply by Augusto Gandia on February 27, 2016 at 2:36am

Hi Peter, thanks for the quick feedback. That is a very interesting method. I will also use it later. But for using it, as well as many other methods, (as far as I understand) I need to already know the matrix(Transform) of the created geometry. (see Parameters) What I need is, after creating a Brep or a Mesh, to get its matrix in referece to the world reference frame.

Permalink Reply by peter fotiadis on February 27, 2016 at 2:59am

Er ... hmm ... this Method RETURNS the trans matrix: hence the out.

I use this frequently when working with instance definitions ... I mean ... InstanceObject types of objects (that are placed due to some trans Matrix applied to some instance definition).

Like:

This code in particular is used in order to manage nested instance definitions (what is referenced where, with what nesting depth, who owns what blah, blah).