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    Need help creating a curved face

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    • BoxB Offline
      Box
      last edited by

      Carsten is showing you an excellent way of working with this, but it sort of highlights how simple and complex your question is. There is a simple answer to making the curve but that answer doesn't work for every situation. Much like anything, learning as much as possible about the different ways to do things will help you look around the corner to see how the wall is constructed.

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      • Dave RD Offline
        Dave R
        last edited by

        How about something like this for the method?

        Twist.png

        -Draw a curve for the centerline of the path of the airplane. I used a Bezier curve with 90 segments.
        -Use the Polygon tool to draw a triangle. The upper two corners represent the airplane's wing tips.
        -Select the curve and the face of the triangle.
        -Run Follow and Rotate. I set the angle to -2.0 and left the scale at 1.0. So that creates a roll to the right of 2 degrees per segment for a total roll of 180 degrees along the length of the path. If you wanted a full 360 degree roll you might make the curve with 180 segments and with 2 degrees of roll per segment.
        -Open the resulting group for editing.
        -Select all of the geometry and use Soften/Smooth.
        -Correct the face orientation as needed.
        -Delete the two unneeded surfaces and their shared curve leaving the twisted ribbon.

        Etaoin Shrdlu

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        • cottyC Offline
          cotty
          last edited by

          Nice and elegant solution, but it will have the same problem with transparent colors.

          my SketchUp gallery

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          • Dave RD Offline
            Dave R
            last edited by

            What problem with transparent colors? I don't see why the color being darker when you're looking through two faces is a problem. It seems appropriate to me.
            Twist.png

            Etaoin Shrdlu

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            • cottyC Offline
              cotty
              last edited by

              I've marked the problematic part with a red circle in your image πŸ˜‰


              trans_prob.jpg

              my SketchUp gallery

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              • Dave RD Offline
                Dave R
                last edited by

                What's wrong with that? Why is that a problem? In a 3D world, there should be a darker area where you are looking through two surfaces. In a 2D image it's a visual cue that this is a 3D shape. There are a couple of alternatives that come to mind. Eliminate the surface so you only have the edges or draw it in 2D to begin with.

                Twist.png

                Etaoin Shrdlu

                %

                (THERE'S NO PLACE LIKE)

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                • cottyC Offline
                  cotty
                  last edited by

                  Don't you get the unwanted effect from the second image if you zoom in?

                  my SketchUp gallery

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                  • BoxB Offline
                    Box
                    last edited by

                    I think you'll find the unwanted effect is caused by too few segments in too tight a curve. You have to be realistic about what the geometry can cope with.

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                    • Dave RD Offline
                      Dave R
                      last edited by

                      @unknownuser said:

                      Don't you get the unwanted effect from the second image if you zoom in?

                      No.

                      And there isn't a line where your red dot is. πŸ˜‰
                      Twist.png

                      If you turn off Profiles, you don't get those edges.

                      With Profiles on you get those edges but with enough segments in the curves...

                      2014-06-27_08-07-18.png

                      Etaoin Shrdlu

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                      • cottyC Offline
                        cotty
                        last edited by

                        πŸ‘

                        my SketchUp gallery

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