How to Densify a TIN Surface in BricsCAD

Quick answer: TIN Densify runs after a TIN surface has already been simplified. You specify the maximum elevation difference allowed between the simplified surface and its excluded input points, within a chosen area, and any excluded point that exceeds that difference gets added back.

How TIN Densify Works

1. The algorithm picks a random point from those excluded during simplification.
2. It checks whether that point exceeds your specified maximum elevation difference against the current surface.
3. If it does, the point gets added back, and the TIN surface updates immediately to include it.
4. The next excluded point is then checked against this newly updated surface, not the original simplified one, so each restored point can affect how later points are evaluated.
5. This repeats until every excluded point has been checked.

What This Achieves

The result is a surface with more points, and more accuracy, either across a specific area you select or the entire TIN surface, without simply reverting to the full, unsimplified point set everywhere.

Frequently Asked Questions

Does TIN Densify check every excluded point against the same original simplified surface? No, each point that gets added back updates the surface immediately, so later checks run against that updated version, not the original.

Can I run Densify on the whole surface, or only part of it? Either. You can specify a particular area to densify, or apply it across the entire TIN surface.

Do I need to simplify a TIN surface before I can densify it? Yes, Densify specifically restores points that were excluded during an earlier simplification step.

What determines whether an excluded point gets added back? Whether its elevation difference from the current surface exceeds the maximum value you specified.