Perspective view without depth distortion?

Rhino
1

Is there a way make perspective view (aka being able to rotate) without depth distortion?

For example in onshape in perspective view a box from the top looks like this:

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and with perspective view turned off same box looks like this:

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image669Ă—343 5.43 KB

Thank you.

2

Change it to a parallel view.

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3

Unfortunately, parallel doesn’t allow to rotate.

I’m trying find an angle where 3 non-planar curves would intersect at the same point. Unless I center it perfectly at the screen, parallel view moves everything away. So, I need a way view as in parallel and still be able to rotate in all axes.

4

I’m pretty sure i’m not understanding the workflow you’re trying to do.

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image1291Ă—644 102 KB

or

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image1599Ă—595 103 KB

5

Yes Parallel projection allows you to rotate the view.

6

Thanks! I had to hold CTRL+SHIFT to able rotate it with space mouse…not sure what’s the purpose for this “feature”, why restrict the rotation if you are in perspective view?

7

What are you talking about?

8

Hi vano -

Perhaps turning off the Always pan parallel views option in Rhino Options -> View -> Pan works better for you?
-wim

2 Likes
9

Thank you, that’s it, works perfectly now!

10

Is there a way create a hotkey to toggle between perspective/parallel projection?

I come up with this python script that works well, but maybe there is a better way?

import scriptcontext as sc
import Rhino


def toggle_projection():
	view = sc.doc.Views.ActiveView if sc.doc else None
	if not view:
		return

	viewport = view.ActiveViewport
	if viewport.IsPerspectiveProjection:
		viewport.ChangeToParallelProjection(True)
		mode = "Parallel"
	else:
		# RhinoCommon overload may require lens length as the second argument
		viewport.ChangeToPerspectiveProjection(True, 50.0)
		mode = "Perspective"

	view.Redraw()
	Rhino.RhinoApp.WriteLine("Projection: {0}".format(mode))

toggle_projection()
11

You should be able to run this macro:

-ViewportProperties Projection Toggle Enter Enter

You can make that run from an Fkey or create an alias or put it on a button.

1 Like
12

Perfect!
Thank you!