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Fences and Moiree-effects

A

AFTRS

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spain
Got a special fence with "Streckgitter" (Translation could be: meshed metal baffle, or expanded metal). On the top a sloped barbwire. (Wasn´t that easy to get the edges done :) )

fence.jpg


OK, definition, etc, also the framerates look good. So no technical problem. The fence is more or less defined in alpha channel technology.

What I do not like: it tends to appear to flicker because it has "Moiree-Effects".

Any advice on how to deal with that?
 
Loosen up the "weave" of the fence wire. IOW, make the XXX weave larger.
 
Yes, this is what I already did.
Changed the texturing and did enhance the polygons.
If I would again change the resolution then it wouldn´t look anyhow good if You are are to narrow.
(I didn´t want to show it from the point of the aircraft´s parking position)
The effect itself will not change by this action.
Tried to get ride of it by some of the non documented material names. None of those I know did work.
This might be one of the, from my point of view, possible ways indicated.
From the texturing point of view, or the point of polygons, I think I have done everything I know.
 
Ensure that you have saved the texture with MIPmaps.

Also, if you have tiled / "overmapped" the UVW's to save polygons whis will exacerbate the moire, as the MIPs will not switch out as early, enhancing the conflicting moire pattern.

If this is the case, consdier adding more polys and remapping the textures less aggressively.
 
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I had good luck with a shimmering fence in FS9 by saving the fence texture as DXT1 w/alpha. Don't know if that works in every case or in FSX, but it solved the shimmering problem in my case and also a draw order problem where objects appearing behind the fence wouldn't show through the fence.

Jim
 
Changed the MipMaps!
That did help a lot.

Want to give a positive feedback and many thanks to the community. All of these hints got me on the right track in the end.
 
Another thing I have found to be helpful: on the alpha channel of the fence texture do not use pure black for the 'holes' between the wires. Instead use something like 100,100,100. It will cut the shimmer a lot, even without mip maps, and your eye will not notice the difference until you are very close.

cheers.
 
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