Mon, 07/10/2023 - 16:52
Hi,
I have a few doubts regarding XCAFDoc_ShapeTool::GetShapes() and XCAFDoc_ShapeTool::GetFreeShapes().
As stated on XDE and XCAFDoc_ShapeTool documentation, GetFreeShapes returns a sequence of all top-level shapes which are free (i.e. not referred by any other).
Does that means that all those top-level shapes won't appear as references of any other shape?
And when GetShapes() documentation says Returns a sequence of all top-level shapes, means that those shapes where added as root but exists the possibility to appear as referenced in other shapes?
In my personal scenario I'm reading a basic primitive (a cube) as a STEP file. And both methods seems to return me the same simple shape. Does the result from GetShapes() also includes the result from GetFreeShapes()?
Regards!
Mon, 07/10/2023 - 17:36
Hello,
They look the same, but for assembly structure they return different result.
GetShapes collect each chape in 0:1 Label. So, if you have references, you will have a lot of dublicates.
As for a GetFreeShapes, you will recieve a roots.
To be honest, I don't see any reason for using GetShapes. I will initiate a process to make as deprecate this method, then we will remove it in the some release.
Best regards, Dmitrii.
Tue, 07/11/2023 - 09:39
Hi Dimitrii,
I want to share the differences using GetFreeShapes and GetShapes with you.
My actual scenario is a STEP file that contains two cubes, one of them is rotated (please see atached image).
When I use GetShapes:
Document
|
|__>Assembly
| |__>Ref to purple cube.
| |__>Ref to white cube.
|
|__>Simple Shape from purple cube.
|__> Simple shape from white cube.
Meanwhile when I use GetFreeShapes:
Document
|
|__>Assembly
| |__>Ref to purple cube.
| |__>Ref to white cube.
If you recommend me to use only GetFreeShapes, what should it be the best efficient way to store all the data of a STEP file that contains references?
My main idea was to use GetShapes in order to store the simple shapes that I get from the document. That way I won't need to visit those shapes again whenever I find a reference that its ¿entry? is equal to the simple shape that I have stored.
Best regards, Lorenzo.
Tue, 07/11/2023 - 11:35
Well, in this case you need to choose what are you need.
GetShapes returns you root of assembly, top-level reference(with location) and simple shapes. But you will lose parts of assembly(moved shapes).
GetFreeShapes returns only roots(it can be simple shapes, top-level references or assemblies). You will lose any shapes that have reference.
But you can use map of shape-labe - to use ShapeTool natively. It help to find out label by map.
Best regards, Dmitrii.
Tue, 07/11/2023 - 13:09
Please could you elaborate on that?
The previous image that I attached, one cube is a copy of the other. So I would expect that both would share (as a reference) same shape.
I'm using the following methods from TopoDS_Shape but all of them returns false.
shape.IsPartner(secondShape)shape.IsEqual(secondShape)shape.IsSame(secondShape)Any Idea why is that?
Best regards, Lorenzo