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Find Projected Area of a 3D model

Anonymous

Find Projected Area of a 3D model

Anonymous
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I have a 3D model of a chimney and to calculate the wind force on it I need to know its projected area. What would the best way to do that be?

 

I'm trying to integrate this into a VBA script but if anyone can tell me how to do it manually hopefully I'll be able to work out how to code it.

 

I'm using AutoCAD 2017 and the 3D model is in .dwg format

 

Thanks!

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john.vellek
Alumni
Alumni

Hi @Anonymous,

 

Please forgive my ignorance but what do you mean by projected area? Is there an example on how you would normally calculate this manually? If so, perhaps I can show you how it might be calculated in AutoCAD.

 

Perhaps you can also attach your drawing so I can get a clearer picture of what you are trying to do.

 

 


John Vellek


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Anonymous
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Hi, sorry for not making it clear. By projected area, I mean the area you see when you look at the 3D model from a given view, which is equal to the area you would see in an elevation drawing of the object.

 

For example, the projected area of a sphere would always be circular as you see a circle from whatever direction you look at it. The projected area of a cylinder would be a circle if you looked at it from below or above and a rectangle if you looked directly at it from one side. The projected area is relevant to me as it is the area the wind 'sees' as it hits the chimney so the wind force is the wind pressure times this projected area.

 

Thanks,

Tom

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john.vellek
Alumni
Alumni

HI @Anonymous,

 

I suspect that Flatshot is what you are looking for.  Here is a thread on converting from 3D to 2D that will show additional options as well.

 

Please select the Accept as Solution button if my post solves your issue or answers your question.


John Vellek


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Anonymous
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Hi, thanks for that, it was very helpful. One last question, is there any command that will measure the area of that shape - something like MASSPROP but for 2D drawings? I know I could use the area command and draw a shape to find the area but my chimney has a complicated curved geometry so that would be quite time consuming.

 

Thanks,

Tom

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john.vellek
Alumni
Alumni
Solución aceptada

Hi @Anonymous,

 

Once you have 2D geometry it is usually fairly easy to measure the area.  If you can isolate the perimeter then just use Boundary. Once you have done that look at it's properties. One of the fields will list the area of the shape.

 

Please select the Accept as Solution button if my post solves your issue or answers your question.


John Vellek


Join the Autodesk Customer Council - Interact with developers, provide feedback on current and future software releases, and beta test the latest software!

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