Hi everyone,
I have a problem. I am working on but I did not find a solution.
How to find outer surface area the section ?
Ex I attached L Section profile. I want to outer 4 surface. Is it possible ?
Thank you so much.
It’s certainly possible, you just need to figure out how to do it. By that I only mean figure out how you can define those “external” surfaces. Why those surfaces? Why not the other surfaces? What makes them different? If you can’t logically separate the two cases then you’re left with a manual problem of selecting each face.
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@DynaGirlBIM why you need Dynamo for that? You can implement parameters within the family and calculate the Area value parametrically.
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Hi @Draxl_Andreas , I know this. But I want to automatic find the outer faces. 
Hi @Nick_Boyts you are absolutely right. I do not know how to this surfaces seperate other surfaces.
@tradelie yes, I know do this. But The surfaces I want are not all.
I don’t know if I can separate the outer surfaces
The point is that if you don’t know how to (logically) determine which surfaces are needed and which are not, then you won’t be able to tell a computer how to choose either.
For your specific example I would recommend something based on the centroid of the solid. The centroid should fall on the “inside” of the geometry, meaning that any surface that does not have a direct line of sight to the centroid would likely be on the “outside”.
@DynaGirlBIM Not really sure what you are after, it depends what you consider outer face and what is inner face; Otherwise using Labeled Dimensions will get any area value as long as you know what you want.