seantanst Posted November 13, 2011 Posted November 13, 2011 I'm trying to find a way to inscribe an ellipse into a triangle (not an equilateral triangle), i.e. the ellipse touches the 3 inside sides of the triangle. Does anyone know how to do this? Quote
eldon Posted November 13, 2011 Posted November 13, 2011 Inscribing a circle into a triangle has an unique solution, but I would think that an ellipse would have too many variables to be able to offer a general solution. If the ellipse size is fixed then it is easier to draw a triangle to enclose the ellipse, by using the Tangent Osnap. Perhaps if you had some definite sizes in mind, please post them and someone might find a solution. Quote
JD Mather Posted November 13, 2011 Posted November 13, 2011 Attach what you have tried so far. Are you familiar with geometry constraints? Quote
seantanst Posted November 13, 2011 Author Posted November 13, 2011 I don't have a specific example to show you, but I'm looking for a general way to do it. I'm relatively new to autocad since I'm a student learning at the moment. My lecturer was talking about using projection lines and true shapes to draw the ellipses which got me thinking: there must be an easier way to do it, right? @JD Mather: is it possible with geometric constraints? I'm not familiar with it... Thanks for both your help Quote
JD Mather Posted November 13, 2011 Posted November 13, 2011 @JD Mather: is it possible with geometric constraints? I'm not familiar with it... Uhmmm, can't you see the picture? Drag any of the lines and the ellipse updates to remain tangent. Ask your lecturer to show you how to use geometry constraints on the Parametric tab. So Easy! I think a bit more information would be needed though on the design intent. Quote
seantanst Posted November 13, 2011 Author Posted November 13, 2011 Thanks heap JD Mather. You're a star! Quote
JD Mather Posted November 14, 2011 Posted November 14, 2011 There are an infinite number of ellipses that can be tangent to any triangle. Your lecturer should demonstrate the desired solution for this particular problem. Quote
eldon Posted November 14, 2011 Posted November 14, 2011 (edited) Of course, if you just want to draw an ellipse inside a triangle, first draw a circle inside the triangle, and then rotate3d, about any 2point axis to suit even though the circle will still be a circle, but it will look like an ellipse. P.S. If you now flatten this rotated circle, it changes into an ellipse Edited November 15, 2011 by eldon more information Quote
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