Yes, I know them as Level Points as that's what they used to be in the UK packs. For some reason they are now Elevation Points in the 2016 UK pack.

MASTERLEDspotMV

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Steps 4 and 5  are important and help it blend into the surface, especially when the trees are on a slope. This minimizes surface clean up after its added as a breakline.

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No need to create polygons, just use the donut command, convert them to featurelines, stepped offset to the inside and up to the top.

Thanks Joe, I was just working through this. Yes as part of the TIN. We are developing a 2-d hydraulic model for sediment transport and the cone screen, trees, bollards etc are flow obstructions....

Yep that works, Thanks. The donut commmand is a new one and useful. Once I realized that Level Points are "Elevation Points" I added those and it made a nice smooth cylinder. Thanks for the input!

I was under the impression that you cannot merge solid objects from the 3-d modelling workspace with TINs... maybe I need to reveisit this.

Don't know why you would want that other than rendering. >> 3d modeling Work space >> circle push pull, then set elevation

Just had success with this approach: Create polygon with 250 sides to approximate circle, set elevation. Slight offset, new elevation. Add as breaklines. I would rather use a FL but I have not seen a way to make a circular FL, Ive used 2 arcs but they do not give enough vertices.

Philips Showline SLLEDSPOT300

I am developing a surface for a hydraulic model and need to include vertical objects. I have a topo surface and need to add bollards and tree trunks (ie cylinders) to the topo surface. Ive already added walls and a building using feature lines.

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SPOTLED

The donut command creates a polyline with two half circles. When you convert them to featurelines, they lose their width.

Not sure if it's the same as what you want but I used this for developing complex ground models for overland flow modelling, where there are circular structures as obstructions.

Normally I would say you didn't nee to add extra Elevation Points, just use the Insert intermediate grade break points option when you do the elevations from surface. (This option automatically adds an elevation point anywhere where the featureline crosses a surface TIN line.) However, if your circle didn't cross any TIN lines, it would end up with just two elevations, and it really needs at least 3 elevation points to define the plane that it sits on.If I were you, I'd attack it this way:4) Add Elevation Points at two midpoints of the featureline. (You now have four points: two PIs and two Elevation Points)5) Assign elevations to FL from the surface, using the Insert intermediate grade break points option6) Use 'Stepped Offset' command to offset FL by 0.1 horizontally and 10 feet vertically to make the "top circle".7) For the top circle delete all elevation points (to make it clean)8) Add both Feature Lines to the surface, assigning a low Mid-ordinate distance.A mid-ordinate distance that is small enough will make the surface triangulate nicely around the circle. You'd have to play with it a little to find the right distance. Maybe 0.05'?