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Thread: Parabola

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    Default Parabola

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    I needed to get a parabola.. Didnt know how to do it.. typed in parabola, and found that it worked! Selected 3 points and it drew me one that fits perfectly, but it still has the three points and slashed line. How do I make it the line I want ( layer ) and make the rest disappear? I cant find how to do either.

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    I have moved your question to the Civil 3D section since standard Autocad does not have the Parabola command.

    Take a look at this link for information on creating Parabolas in Civil 3D: https://knowledge.autodesk.com/suppo...A31C3-htm.html
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    Not sure about question points disappear once you tick the green arrow Civ3d creates 3 Aecc cogo points there is no doubt a parabola "style" as well. The only thing is parabola can have multiple formulas
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    Let's assume that the axis of symmetry of the parabola is vertical (parallel to the y axis) and that you know where the slope is zero (parallel to the x axis, point A in the drawing). You can then create an exact parabola using 3 CV (Control Vertex) points as follows.

    Determine points C and D where C is the midpoint of AB and D is at the intersection of a vertical line through C and a horizontal line through A.

    Draw a spline using the CV method and points A, D, and B.

    parabola1.JPG

    Since only 3 CV's are used the resulting spline will be degree 2 (not 3) and will be an exact parabola.

    Code:
    Command: SPLINE
    Current settings: Method=CV   Degree=3
    Specify first point or [Method/Degree/Object]: m
    Enter spline creation method [Fit/CV] <Fit>: cv
    Current settings: Method=CV   Degree=3
    Specify first point or [Method/Degree/Object]:
    Enter next point:
    Enter next point or [Undo]:
    Enter next point or [Close/Undo]:

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