[Wish] select curve's control point(s) as sub-object(s) without turn on

[user454]

Hi friends,

I can select control points of surface/brep and so on by using Ctrl+Shift+mouse.

But I can’t select control points of curve(s) by using Ctrl+Shift+mouse.

This is kinds of counter-intuitive,isn’t it?

In fact,it would be very useful if we can do in this way.We don’t have to press F10 to turn on all the control points firstly and many time would be saved.

Plus:I found similar topics:

@keithscadservices

but not polylines. But I swear I was able to select polyline vertexes this way.

Interesting! He swear it can be achieved in the past.I am not very sure about this.More testimony is needed.

[user454]

@wim

I suppose there might be a reason that I don’t know about. I’ve search this forum and the issues database to find reports about this behavior but didn’t find anything. You might be the first to notice.
At any rate - I’ve put it on the list and we’ll see what the developer says…
RH-70279 Subobject Selection: Doesn’t work on points of curves
-wim

Interesting ! This question was logged more than 3 years ago.

[Rhino_Bulgaria (Bobi)]

Have you tried these options at the bottom?

[user454]

Yes,my settings here is the same as yours.

Wait,why you say this?You mean you can select curve(s)’s CPs without turning on them first?

[Rhino_Bulgaria (Bobi)]

Yes, you can. You can also select curves and surfaces whose control points are on.

[davidcockey]

@user454

I can select control points of surface/brep and so on by using Ctrl+Shift+mouse.

But I can’t select control points of curve(s) by using Ctrl+Shift+mouse.

This is kinds of counter-intuitive,isn’t it?

I think I know what is going on.

You are not selecting “control points” of the surface and polysurface. Control points are specific type of entities directly tied to the NURBS representations of surfaces and curves.

Instead you are selecting a different type of grip which are located at the corners of surfaces including surfaces joined into polysurfaces and solids. These grips can be turned on, and made visible and selectable using the command SolidPtOn.

SolidPtOn

Toolbar	Menu

Solid Tools|Solid

Solid Edit Tools >

Turn On Points|

The SolidPtOn command turns on grips at the ends of surface and joined polysurface edges, including closed solids.

Curves do not have this type of grip. Curves have “control points” and “edit points” (also known as Greville points.). Edit points are fundamentally different than surface “solid points”.

Ctrl+Shift+mouse works only on the surface “solid point” types of grips.

Note that the control points of polysurfaces and solids cannot be turned on. Only the “solid points” can be turned on.

[user454]

How could you select multiple curves’ CPs without turning on them firstly?Could you show me the steps?

[user454]

Thanks for this clarification,and it really make sense .

I agree with you that these child-objects is not Control Points ,the reason is that once CP is unchecked in the filter window,these points can still be selected .I think their real name should be “Vertex” .

Now the question is why not make curve’s CP equal to “Vertex” of Brep ?

[Rhino_Bulgaria (Bobi)]

You simply have to check these tickboxes in the Rhino options and try how the selection works. It’s great for a few quick adjustments, but if you are going to adjust the control points of a single curve multiple times, it’s better to simply turn on its control points the traditional way.