Can't force "Create TIN" to make use of hardlines the way i want

[StanislawPolanski]

Hello. I'm studying mining surveying, I have to count mass volumes etc. I'm creating TIN from masspoints, but when I apply hardlines to the TIN it doesn't work as I want. I have two feature classes, one is masspoints, the second are the edges of scarp:

http://i61.tinypic.com/25g5k4x.jpg

I can't set hardlines to fixed heights, because the masspoints on the edge varies a bit. The TIN looks this way:

http://i59.tinypic.com/2a5hxua.jpg

I want these blue lines to stay at approx. the same height. It has to look like this:

http://i62.tinypic.com/15k6j4.jpg

What am I doing wrong?

[XanderBakker]

Are you aware that you can include and/or attach images in/to your thread? Please do so to avoid people to go to a site that is bumped with adds...

[StanislawPolanski]

I'm sorry, here're the images:

[XanderBakker · Accepted solution]

Thanks for adding the images.

From the examples I see that the hardline do not have z values, or at least you are not using them. In case of using hardlines without elevation, they become sequences of one or more triangle edges, but you are not forcing a certain elevation. In case you have elevation information on the edges of scarp (or can simulate them), add them to the hardlines. That way you will enforce the edge. See also: Fundamentals of creating TIN surfaces

Kind regards, Xander

[StanislawPolanski]

Thank you for an advice and explanation. That is exactly what I wanted to do.