Jump to content

Recommended Posts

I want to create a lens that is 4.66" in diameter and 1" tall. 

 

The way I created it was:

  1. Create a flat circle with target diameter
  2. Create a hemisphere (diameter doesn't really matter, just needs to be a lot bigger than the flat circle)
  3. Align the flat circle vertically so it matches the diameter at a specific height of the hemisphere
  4. Use the split tool to create a solid section
  5. Take that new almost-there lens and convert it to NURBS
  6. Adjust the height to 1"

 

image.thumb.png.80bef05a9a2471942ba8f7cae900fb9c.png

 

If I instead:

  1. Create a hemisphere at 4.66" in diameter
  2. Convert to NURBS
  3. Adjust the height to 1"

 

I end up with more of Pancake shape (V2) then a lens shape (V1):

image.thumb.png.769055547fe921ea6489b19a4ac758f7.png

 

Does anyone have a recommended workflow for this?

 

 

Share this post


Link to post
Posted (edited)

Have you tried the Sweep command? 

 

The other command which I think may give you better results is the Revolve with rail command from the 3D Powerpack. That will give you a Nurbs Surface

 

If you want to then put a cap on the bottom, then use the extract tool to get the bottom ring and convert the resulting Nurbs curve into a Nurbs Surface and Add the Solids together (Add Solids command) 

Edited by markdd

Share this post


Link to post

@markdd using the sweep command works like a charm and gives you the right flexibility to control the arc type for the lens (I.e., V1 vs V2 from previous post). 

 

Revolve with rail works too, but the base shape (I.e., the lens arc) is harder to modify after you've done the action. If you double click the new NURB "lens" it gives  you individual control of each point:

image.thumb.png.110313136413746ce19c972b7fc2ec37.png

 

Ideally you can revise that arc if you need to and it seems like you can really only do that intelligently using the sweep command:

image.thumb.png.cb8ff4660ac93ccfa4d71d1145982dad.png

 

 

I'm also seeing this extended geometry with the Revolve command and I'm not really sure what that means. 

 

image.thumb.png.7d3cd63e9827bf00616b40c384361b21.png

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...