CSG Substraction in blitz with a b3d file

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Panno (Posted 2004) [#1]

hi there how to csg substraction in blitz on a b3d file ?(maplet)

Panno (Posted 2004) [#2]

solved ! its too slow for realtime

UByte (Posted 2004) [#3]

I would be interested in how you achieved this. I'm doing a map editor. It's at the conceptual stage and relies on boolean operations but am at a loss as to how to implement it. Any clues?

jfk EO-11110 (Posted 2004) [#4]

There is a nice example in the code archives, by Markus Rauch if I remember right.

UByte (Posted 2004) [#5]

Just checked it out, thanks. Excellent stuff but I'd hate to just rip it off directly without understanding it. Can anyone reccomend any good articles/tutorials online covering the implementation of at least the subtract/carve operation?

jfk EO-11110 (Posted 2004) [#6]

Sorry, not me :) , but I got to mention that the CSG example sometimes leaves strange gaps etc behind (probably due to rounding errors), so it's a good idea to weld the vertices after every csg operation (actually only raster their positions) and still before to UV-Mappingt takes place.

poopla (Posted 2004) [#7]

Aye, it leaves seams. You'll need to run a weld routing over the resultant mesh.