them bleeding colours

Blitz3D Forums/Blitz3D Programming/them bleeding colours

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I am trying to do something like "create a grid" by "Matty".
http://www.blitzbasic.com/codearcs/codearcs.php?code=950

(You create a tiled, single surface mesh, using one texture.)

But the colours of the adjacent tiles are bleeding in.
All the tiles should be of one colour, but it looks as if they are outlined.
Is there a way to prevent this?