Center point axis for 3dObject how can I find it? 2

[GregCost]

I want to rotate an object using 3d-object directly on one of the faces of the object (used as an axis). I’ve tried to approximate the 3d coordinates or center point of the rotation axis for 3d orbit and move the object to that point. I have also tried placing the UCS to the face I want the rotation to occur. ... All I really want to do is rotate the object without having it disappear off the screen by taking an elliptical orbit. There must be a very easy way to do this but I can’t find it in the doc. Thanks

 

[rKeyTek]

Have you tried to type in (when prompt to choose your BASE point)
'CAL
<enter key>
MEE
<enter key>


This should grab the MIDPOINT between 2 enpoints automatically.
You only need to be sure of those 2 points for the midpoint of your mass.

Hope that helps.
Rich

Happy Holidays

 

[GregCost]

Ok, I tried a couple of things and found two ways to do it.

Option 1:
Figure out what point of the 3D object you want to use as the center of the 3DCORBIT. If you know the size of the drawing plane half the X,Y value is the center when Z = zero, You can then move the 3D objects point to half the value of X and Y and then rotate the object. You can verify this by using the Compass visual aid during rotation.

Option 2:
If you have a single object you can simply turn on 3DCORBIT and turn on COMPASS and then from the menu bar select VIEW>3D VIEW> then select any of the views top, bot, SW, NE etc. The object automatically becomes centered and will rotate on a center point. With multiple 3D objects you’ll need to select that object (highlight) so when you turn on 3DCOTBIT on that object shows up in the viewport and then follow the same procedure and that object will automatically be centered for rotation.

There is probably an easier way to select a 3D object point and rotate the 3D object on that point (unfortunately I’m a little light on autocad experience) But I’m getting there.

If anyone know of an easier way to do this please respond. Thanks GregCost Have a great Holiday!

 

[GregCost]

Ok, I found an easier way to do it with single or multiple 3D objects.

With multiple 3D objects you’ll need to select that object (highlight, click it) so when you turn on 3DCOTBIT only that object shows up in the viewport. Do a right mouse button click for 3dcorbit options; select more and then select “zoom extents” this will automatically center the selected 3D object for you.