Strange effect with a bsp

Blitz3D Forums/Blitz3D Programming/Strange effect with a bsp

Knotz(Posted 2003) [#1]
Hi,

I've noticed that when i walk through our bsp levels and looking from a specific place and angle we get strange 'ghost' walls. Any idea what may the cause of this?

With 'ghost' walls:
[img]http://www.interstudio.nl/temp/bsp_artifact1.jpg[/img]
Without:
[img]http://www.interstudio.nl/temp/bsp_artifact2.jpg[/img]

Thanks in advance.

Steven


Rob(Posted 2003) [#2]
You do not need any tags to show an image. Also, I cannot see from the screenshots what the problem is because they are too small.

If you mean it completely dissapears then it's probably a bug.


Beaker(Posted 2003) [#3]
Maybe you are too close to the wall. If so, make your CameraRange smaller (if its currently 1,1000 then set it to 0.1,100) OR your collision sphere larger.


Knotz(Posted 2003) [#4]
If you look at (the small) screenshots you'll see that one shows a very large grey polygon in the right in the of the viewport. This is what i call the 'ghost' wall. If i rotate around my axis on that specific place in the level it appears and disappears. It's not something we put into the level geometry.


Beaker(Posted 2003) [#5]
Very mysterious.




simonh(Posted 2003) [#6]
It looks like part of the level is being hidden when it shouldn't be, this might be a bug with either Blitz or with the BSP file itself. Try removing that thin wall in front, that looks as if it could be confusing matters.


Stuart Morgan(Posted 2003) [#7]
I have seen this "effect" or "bug" happen in commercial games.


Knotz(Posted 2003) [#8]
my best guess for the moment is that we make not enough use of detail brushes and a bug in q2map2 (the bsp compiler). On the other hand the 'ghost' walls don't appear when cruising the levels using worldspin...