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  1. #1
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    Default How do I accomplish this rotation?

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    Hey guys, another quick one here.

    I'm trying to rotate objects around an ellipse. Here's a quick look at what I'm trying to do:



    I want to rotate that second box on the right so that it faces the center of the ellipse, yet remains connected to the first box at the front corner.

    Here's a close up:



    Basically I want to rotate around the point indicated by the blue circle, and end up where the red line is lined up with the ellipse's center.

    For the life of me, I can't get this to work. I start the ROTATE command, and select that point. Then I hit R for reference, then select two points on the red line, then select the center of the ellipse, but for some reason it only rotates enough as if the blue point were the reference point.

    In other words, this is what I get:



    Am I just totally borking the ROTATE command? Or is this even possible to do?

    Thanks for the help.
    Attached Images

  2. #2
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    Stop giving yourself a headache and download Lee Mac's custom lisp routine called Align Objects to Curve. The demo he provides will give you some idea of how it works. First, however, read the program description.

    http://lee-mac.com/objectalign.html
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  3. #3
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    Default

    EDIT: Augh, this isn't really what I wanted either. Nevermind. Mods please delete, I can't find the button for that...

  4. #4
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    Quote Originally Posted by ReMark View Post
    Stop giving yourself a headache and download Lee Mac's custom lisp routine called Align Objects to Curve. The demo he provides will give you some idea of how it works. First, however, read the program description.

    http://lee-mac.com/objectalign.html
    Holy smokes, very cool! I'll definitely check this out... I have a bunch of different shapes to align to this damn ellipse. This thread was good for something! Thanks!

  5. #5
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    Not what you wanted? Please explain what I missed and/or how Lee's Align Objects to Curve fails.
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  6. #6
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    Sorry, I mean aligning that red centerline with the center of the ellipse isn't what I wanted; the rotation is too extreme, which makes sense for an ellipse.

  7. #7
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    So if you were to rotate the box with the red line in it, and get it (the red line) passing through the center of the ellipse, a portion of the bottom of the box will be inside the ellipse. And that's an acceptable result?
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  8. #8
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    This is my attempt.

    First image is the "before" rotate. Second image is "after" rotate. Is the second image the result you are looking for?

    EllipseRotate1.JPG

    EllipseRotate2.JPG
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  9. #9
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    Yep, that's perfect, although after I made the thread I realized that's not exactly what I wanted to begin with. What I really want is to align the "front" face of the green box with the ellipse, which is just a matter of drawing a circle and rotating the box so that the other "front" corner intersects the ellipse. So you end up with an circular segment's worth of the green box that's inside the ellipse, but that's OK.

    But, this is more easily done with that LISP you posted earlier.

  10. #10
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    So you now have a workable solution to your problem?
    "I have only come here seeking knowledge. Things they wouldn't teach me of in college." The Police

    Eat brains...gain more knowledge!

    I'm now a full member of the Society for the Promotion of Mediocrity in CAD. Standards? We don't need no stinkin' standards! Take whatever advice I offer and do the opposite.

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