ChangeSpace doesn't move objects on the CPlane of the active detail view?

Rhino
, , , ,
1

Hi,

First of all, I have to say thank you for the ChangeSpace command. It is very useful!

But when using it and working with named views made from clipping planes etc… I realised that ChangeSpace doesn’t move the object to the CPlane of the active detail view. I don’t understand how ChangeSpace determines placement when moving the object in model space from a detail. Placements are not always made in the same way.

Wouldn’t it be useful to move the object to the relevant CPlane?

Below is an example of how this can be used, for example when working on a section. It would be great if objects could be moved directly to the CPlane of the view.


ChangeSpace.3dm (3.9 MB)

Best,
Pip

2

ChangeSpace moves geometry between model and layout spaces. It does not pay attention to construction planes. For that, use RemapCPlane.

— Dale

3

Dear Dale,

Thanks for having a look here.
RemapeCPlane will take into account the origin of the CPlane and I don’t think it will work from a Layout Viewport. It will move the object completely elsewhere. With the changes in scale between the two spaces, I don’t see how this command can place objects in the right place.
I’ve tried but I can’t get it to work from the layout.

I’m just looking for ChangeSpace but with a projection on the C plane after execution. I can do it manually.
It’s just that now, the positioning of the objects after the execution of ChangeSpace seems random, and if I have to repeat this operation several times in time, the objects always end up in another plane. I have the impression that this command could gain in consistency with the inclusion of a projection on the concerned C-plane.

Best,
Pip

4

Can you post a sample file that exhibits this random behavior?

5

That’s an example:

In the video, you can see a “building” with a section (clipping plane) :

  1. Named view saved from clipping plane with Set CPlane and parallel projection
  2. Go to layout create a New detail
  3. Set detail according to saved named view
  4. Draw an object in the layout (Video: text)
  5. ChangeSpace with this object and the detail
  6. Go back to the model

→ The object is in the model space. In terms of placement according to the “Section” CPlane: x and y are correct, but z seems to be related to the centre of the objects present in the model.

  1. To confirm this, create a new object in the model (Video: duplicate the house and move)
  2. Go to layout
  3. Create a second object
  4. ChangeSpace
  5. Go to model

→ The new created object is also good in x,y but has a different z than the previous object. It’s seems effectively to be related to a kind of center of all the objets presents in the model.

So I understand that the behaviour of ChangeSpace makes sense for details with views that aren’t linked to a CPlane (random views, perspective etc..).
It’s more confusing when using views with parallel projections and CPlane, such as plan, section and elevation.

I worked out something so that the objects are projected directly onto the section plane for this kind of views. I don’t know how well it’s done but it seems to work.

ChangeSpaceAndProjectToCPlane.py (2.5 KB)

1 Like