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โš ๏ธ Libfredo 15.4b | Minor release with bugfixes and improvements Update

Forming faces on curved surfaces?

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  • C Offline
    cdde
    last edited by 18 Dec 2008, 04:38

    Hello... again.

    Probably another obvious mistake I'm making, but I can't figure out what the issue is...

    I'm trying to draw a curved roof for a castle tower... If I just draw straight from one point to another, no problem! I get this:
    http://img361.imageshack.us/img361/7146/picture2bt3.png

    But if I use the Arc tool, no surfaces will form:
    http://img384.imageshack.us/img384/6973/picture1ae0.png

    I had a cross on the upper square that I aligned the arc's with, so they should all be even. Should I not use the arc tool? Is there something else I can do to accomplish the same goal? Maybe I need to explain what I did more clearly? Help please!

    Thank you!

    /Craig

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    • S Offline
      solo
      last edited by 18 Dec 2008, 04:50

      Try this, using the follow me tool:

      http://img381.imageshack.us/img381/8370/roofrs9.gif

      http://www.solos-art.com

      If you see a toilet in your dreams do not use it.

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      • G Offline
        Gaieus
        last edited by 18 Dec 2008, 05:03

        Hi Craig,

        It is natural tghat you cannot get a surface from these arcs ince that surface would not be "coplanar" (i.e. the edges of the arcs and the top and bottom lines are not on the same plane which is needed for a face to be created).

        If you hover over the arc with the line tool, you will see green inferences" and tooltips saying "Endpoint". Now what you would need is to "hand stitch the respective endpoints between two arcs and at the end, soften the edges.

        Another way would be to form curved surfaces first, copy rotate them around the centre and intersect them with each other. After intersecting, you can delete unwanted geometry.

        A third (probably easiest) way would be to draw the 2d section of the roof vertically on the top of the tower and use the follow me tool (see an example file added)
        LatheRoof.skp
        In your model, just connect the ends of two arcs diagonally on the opposite corner (a face should be created), select the edges of the top square and click on the diagonal face with the follow me tool

        Gai...

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        • G Offline
          Gaieus
          last edited by 18 Dec 2008, 05:04

          Darn, Pete, you beat me... ๐Ÿ˜ 

          Gai...

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          • C Offline
            cdde
            last edited by 18 Dec 2008, 06:55

            Oh man! You guys are both awesome! I would of never expected an answer of such high quality... Animated gifs and everything!

            Thank you guys!

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            • C Offline
              Chris Fullmer
              last edited by 18 Dec 2008, 07:11

              @cdde said:

              Oh man! You guys are both awesome! I would of never expected an answer of such high quality... Animated gifs and everything!

              Thank you guys!

              Ha! welcome to the SketchUcation forums. We often go out of our way and over the top to help people ๐Ÿ˜„

              Chris

              Lately you've been tan, suspicious for the winter.
              All my Plugins I've written

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              • C Offline
                cdde
                last edited by 19 Dec 2008, 01:03

                SketchUp must not like me...

                I can't even get a face to form by doing what appears to be the exact same thing Pete is doing.

                If I just draw the roof like what Pete showed... I get this:
                http://img522.imageshack.us/img522/8094/picture4pr2.png

                If I draw a straight line from point to point... I get a face:
                http://img522.imageshack.us/img522/350/picture5xk3.png

                BUT!! If I delete the original lines, the straight edge and the arc will form a face:
                http://img249.imageshack.us/img249/2720/picture6rq7.png

                AND!! If I undo that delete and delete the arc, the face will stay intact:
                http://img228.imageshack.us/img228/5797/picture7wi2.png

                For the life of me, this makes no sense... One side of the arc will allow a face to form, but not the other. I've deleted everything and started over to make sure everything was on the right plane... still nothing.

                This doesn't seem like it should be this hard... but I'm at a loss.

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                • S Offline
                  solo
                  last edited by 19 Dec 2008, 01:14

                  Here is the .skp of roof before 'follow me'.

                  follow me roof.skp

                  http://www.solos-art.com

                  If you see a toilet in your dreams do not use it.

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                  • C Offline
                    Chris Fullmer
                    last edited by 19 Dec 2008, 01:22

                    The order to draw the shape for me would be:

                    draw the line down first. Then the flat line, then a straight line to connect and make a flat face. Then draw the arc, and make sure its not too big or too arched. if its too arched, it can overlap the line going straight down, which will result in problems - like faces not closing.

                    Chris

                    Lately you've been tan, suspicious for the winter.
                    All my Plugins I've written

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                    • C Offline
                      cdde
                      last edited by 19 Dec 2008, 01:32

                      OK... Yes. If I delete your work, I have no problem reproducing it. As I suspected... user error.

                      I don't know why, but following the blue axis down was what was giving me the problem. Make's me think there is something wrong with the model somewhere. Ohhh well! I have the curved roof now! Thank you for your patience and help.

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                      • N Offline
                        neng83
                        last edited by 19 Dec 2008, 16:19

                        Hi cdde!

                        you probably don't need this any more, but I just thought it might be a good idea to share the infor.

                        here is how I do it on my model: see attach

                        Cheers ๐Ÿ˜„


                        Curve roof with Followme tool.skp

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