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Commented 6 years ago2013-11-09 06:38:42 UTC in wiki page: Tutorial: Tetrahedron Terrain Comment #100865
Hello, I'd like to comment on this:

quote start

Most importantly, however, using them instead of wedges will usually cut down wpoly/clipnode/leaf counts by 20-30%.

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I checked out your test maps with RipEnt and in-game, and most of your claims appear to be false.

First of all, the clipnode and (world)leaf counts aren't lower at all when using tetrahedrons instead of triangular prisms -- they're higher.
http://i.imgur.com/NKYmppj.png

The wpoly count is slightly better when using tetrahedrons though, I'll give you that.
Summary of most important findings:
http://i.imgur.com/Jlchjb6.png

I would like to advise everybody to stick to good ol' triangular prisms ( http://i.imgur.com/Vv4CiCx.png ). The slightly higher wpoly count can easily be optimized by using VHLT's "SOLIDHINT" texture anyway.