[ Feature ] import of layer added

[bernd]

The import of layer was added with git commit c3ba041 I tested with files exported from Allplan and ArchiCAD. Would be good if you guys out there could test this with other CAD exports and give feedback.

cheers bernd

Screenshot_20191107_081107.png (73.32 KiB) Viewed 1310 times

[Roy_043]

In other CAD programs every graphical object has a layer property. This is not the case in FreeCAD where a layer is really a group. How do you deal with this fundamental difference?

[chrisb]

I'm not familiar with layers in other CAD programs - I know them only from Gimp, but I imagine that the Std Part container can very well serve as a 3D layer with its own visibility and its own placement.

[bernd]

it is just a question of which direction is the link set.

Does the object has a layer property and links to the layer and the programm needs to take care each obj with the same property have the same layer

or

has the layer a link to all its childs.

The second is much easier to code in FreeCAD.

BTW: It should not be to difficault to add the information to each object which shows to which layer an object belongs to. For the user it would look like any other CAD than.

BTW2: In ifc the layer knows his childs, and the child knows hid layer due to inverse property.

[petit_chat_noir]

You should have a look on WoodFrame workbench.
I added attributes system, this sounds like what you are talking to.
It could be easy to add an IFC-Layer attribute on the object
So with that you can select/hide objects by group/Material/sub-group and more

[yorik]

If an object can have one and only one layer, then it doesn't really matter having the object to hold a layer property, or the layer to hold a list of children (like it is now). The result will be the same.

It is more a matter of how we want to construct the dependency tree...

[bernd]

It is more a matter of how we want to construct the dependency tree...

Nice to see on the difference between materials and layer. The material is a link from the object to the material, the layer is a link from the layer to the object.