Jump to content
Andy Broomell

What is the Perspective Distance value?

Recommended Posts

I use Perspective Distance all the time in Vectorworks to change the amount of perspective in my view. I understand its function, but it just occurred to me that I don't understand what the value actually is. Does it relate to something in a physical camera?

 

1104958512_ScreenShot2019-09-12at9_44_33PM.thumb.png.a4461dfe983aec770b48ebbbcca600c4.png

 

For RW Cameras there's the "Field of View" parameter which alters the exact same thing, but in that case it's easier to understand what the number is referencing.

 

Just curious 🙂

  • Like 1

Share this post


Link to post

The distance is the distance between the center of projection and the view plane, if that helps.  What you see will depend on layer scale and crop rect, if that is on.

 

Share this post


Link to post

I'm once again curious what the "Perspective Distance" value actually relates to in real life. What is the 'view plane' referred to above (in Vectorworks I mean)? If the view plane were visible or measurable that answer would make more sense to me. Also, I'm not sure what layer scale has to do with it. I'd be thankful for additional explanation there.

 

I realize this parameter changes the amount of perspective, but is it referring to a measurable distance? Or is it a scale factor of some sort? Or is it an arbitrary number? (that's a valid answer).

 

With some playing around, it seems that there's a relationship of 1:1.111 between the Perspective Distance and the width of the camera view at that distance. For example, if I set the Perspective Distance to 10, then 10" away from my camera's origin the width happens to be 11.111" wide. This ratio seems to hold true for any distance and also in other units, though I'm not sure what conclusion can be drawn from this, haha.

625927842_ScreenShot2020-06-25at4_15_18PM.thumb.png.eb01da2397f3186c9327972ff6c690ec.png 1099300092_ScreenShot2020-06-25at4_15_24PM.thumb.png.c72765bbb7657600ffcf4618665b5f76.png

 

 

I'm down the rabbit hole a bit, and at the end of the day it's just curiosity and not crucial. Currently when students ask what that number is I simply say it's arbitrary and there's no reasoning behind it. Hopefully I'm wrong.

Share this post


Link to post

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


 

7150 Riverwood Drive, Columbia, Maryland 21046, USA   |   Contact Us:   410-290-5114

 

© 2018 Vectorworks, Inc. All Rights Reserved. Vectorworks, Inc. is part of the Nemetschek Group.

×
×
  • Create New...