Non-closed multipatch

Question

I have a collection of building polygons with height attributes. I hoped to convert these to multipatch, union them to aggregate parts of buildings together, and then calculate surface area and volume. I am able to create the multipatch, but for some reason many of the buildings are unclosed, leaving me unable to union or add z information. Why would 3d analyst create unclosed features from an extruded polygon? Is there any way to close the features?

Thanks,
Patrick Sewell

YCLai · Answer

I'm having the same problem here.
I made a ground body by several steps, it turns out the multipatch isn't closed.(confirmed by "is closed 3d"). These are my steps,
1. use "Raster to tin" to create a ground surface tin from my dem raster.
2. Build a rectangular tin at certain elevation by using "create tin"(add in a rectangular polygon with z value and set sf_type as "hardreplace").
3. Use "extrude between", tin 1 is the ground surface tin, tin 2 is the rectangular tin. Feature class is a rectangular polygon bigger then tin 1 but smaller then tin 2.

I can successfully create the ground body I want (here). But the multipatch is not closed hence i can use those 3d analyst tools like intersect 3D.
Is there anyway to "close" the multipatch? Or there's other way that I can create a closed ground body I want?

JakubSisak · Answer

II am trying to create 3D spheres from center points and intersect them to calculate volumes occupied by both spheres.

@Dan - What method are you using?  I just replied to Patric's post and included a link to a discussion that shows how I can intersect spheres and calculate volume....

JakubSisak · Answer

I am able to create the multipatch, but for some reason many of the buildings are unclosed

@Patric - could you post a screen capture of multipatches that are not closed?  I don't seem to be having this issue. I can symbolize points to shperes and extrude polygons then create multipatches that are closed.  See here