On Thursday 17 July 2003 15:03, Norman Vine wrote:
> Erik Hofman writes:
> > 
> > http://www.a1.nl/~ehofman/fgfs/gallery/fokker/
> > 
> > It's starting to look quite good now.
> 
> Coming along nicely
> 
> < nit >
> It is hard to tell but it almost looks as if there is 
> something going on with the normals on the wing
> panels.  ie the shaddowing doesn't quite seem  
> consistant with that on the fusalage.
> 
> FWIW - these same kind of anomalies seem to 
> appear on most of the AC3D model esp on the flaps.
> 
> don't know if this is from the modeller or PLIB loader 
> though
> < /nit >
> 
> Norman

Just as Jim says, the main cause of these problems are smoothing artifacts.

Another thing to watch out for though is where there are polys with > 3 sides.  
These get triangulated before rendering and sometimes the solution is less 
than optimal.  When this happens you have to manually triangulate those polys 
yourself.

I had just this problem with an early version of the YF-23.   At some lighting 
angles there was an obvious artifact on the upper right wing that wasn't 
present on the left, despite the right side being a mirrored copy of the 
left.  What had happened was that a > 3 sided poly had been triangulated 
differently on each side and once I did it manually, so that they were both 
the same (as the left side) the glitch disappeared.

LeeE


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