[MBDyn-users] Blender Objects and CAD

Tomislav Maric tomislav.maric at fsb.hr
Mon Feb 23 19:34:42 CET 2009

Thank you very much for the advice, now I have some guidelines regarding
the geometry. It seems I have a lot to learn. :)

Thank you again for blender/MbDyn scripts!


On Mon, 2009-02-23 at 11:45 -0500, Douglas Baldwin wrote:
> > From what I've found out so far, CAD is mostly imported in blender (.stl
> > is commonly used). I was wondering is it possible to calculate inertial
> > properties, center of mass, etc. within blender on geometry built in
> > blender.
> No, but...
> > Would that be efficient?
> Probably not.  Blender only knows about the object location and the
> verts/faces that make up the object.  In theory, one could write a Python
> script to calculate centroid, etc. about the object location based on the
> verts/faces.  However, CAD is by far superior, since Blender would have no
> convenient access to mass properties, density, etc.
>  For now, I wrote a small python script
> > that generates airfoil geometry within Salome CAD, I calculate
> > everything there, and I'll try to import the geom. in Blender for
> > preprocessing and animation. Is this the best way to work?
> For precise rendered geometry, yes.  However, I have found that the rendered
> objects do not need to precisely represent the geometry.  What Blender and
> MBDyn provide together is the ability to accurately represent the dynamics
> and then artistically represent this behavior.  In the case of a simple wing
> panel, you will notice that in the video tutorial the wing geometry is
> automatically generated based on parameters.  The geometry represented is
> not for any specific airfoil, but visually one would not be able to notice
> the airfoil in any rendered images.  As long as the MBDyn imput file has the
> correct airfoil data the dynamics will be accurate (within the capabilities
> of MBDyn).
> Also, once you become proficient with Blender textures and shading, you may
> find it more convenient after importing the STL to then create a simpler
> object using Blender modeling capabilities that approximately matches the
> STL shape.
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