Lattice optimization without PolyNURBS

Hello everyone!
I am currently working on getting comfortable with all the features of Inspire for using it in a university class. Most things are really straightforward with good results, however I came to a point where I can't find relevant information in the Altair help:
I am currently recreating the Aircraft bracket challenge from GrabCAD: https://grabcad.com/challenges/airplane-bearing-bracket-challenge
The goal would be a lattice optimized bracket with a topology optimization applied beforehand to reduce the overall volume and mass. The optimization results in a shape, which is not really possible to use PolyNURBS on, so I'd like to skip this step and directly use the result of the topology optimization as a design space for the lattice optimization.
This is not possible within the same model since I can't select the result of the previous optimization as the design space. So far I've tried to export the result as STEP and STL. The STEP file does not include the optimization result and upon loading the STL in a nes Inspire file, I can't define it as the design space.
Is there something obvious that I may have overlooked? Or is there no possibility to achieve my desired workflow?
Thank you for your answers!
-Michael

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Thomas Quenaon_21507

Hi Michael Happl,

After the lattice Optimization, it's possible to select the lattice part and then go to Files/Save Selected. Thus you can directly save the lattice geometry to stl or OBJ file.

Is it what you want to achieve ?

BR-

Thomas

Michael Happl

Hi Michael Happl,

After the lattice Optimization, it's possible to select the lattice part and then go to Files/Save Selected. Thus you can directly save the lattice geometry to stl or OBJ file.

Is it what you want to achieve ?

BR-

Thomas

Sorry, I guess I have not been clear enough in my initial message:
I don't even get to run a lattice optimization, since I can't use the result of the topology optimization as the design space for the lattice optimization.

So I am looking for a way to do that, but without a PolyNurbs conversion after the topology optimization.
- Michael

Thomas Quenaon_21507

Sorry, I guess I have not been clear enough in my initial message:
I don't even get to run a lattice optimization, since I can't use the result of the topology optimization as the design space for the lattice optimization.

So I am looking for a way to do that, but without a PolyNurbs conversion after the topology optimization.
- Michael

Same can be done on the Topology result if you don't want to go through polynurbs or Fit Polynurbs option.

So Save topology result as stl and replace part with this STL in your model.

BR-

Thomas

Michael Happl

Same can be done on the Topology result if you don't want to go through polynurbs or Fit Polynurbs option.

So Save topology result as stl and replace part with this STL in your model.

BR-

Thomas

I have tried this, but I don't have the option to set the imported STL file as the design space, as it should be visible in the screenshot attached.

The STL has been checked for integrity, so it contains only one closed shell. No holes or other errors remain.

- Michael

STL import.PNG

Thomas Quenaon_21507

I have tried this, but I don't have the option to set the imported STL file as the design space, as it should be visible in the screenshot attached.

The STL has been checked for integrity, so it contains only one closed shell. No holes or other errors remain.

- Michael

Did you try with OBJ ?

BR-

Thomas

Michael Happl

Did you try with OBJ ?

BR-

Thomas

Thanks, looks like I can use it as the design space now, although it is now very slow. I will try to run an optimization and see if it works.

- Michael