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- Date: Wed, 18 Feb 1998 07:21:51 +0800
- From: FRICK Christopher <christopher.frick@WRC.WA.GOV.AU>
-
- Hello all,
-
- I have a problem with the OLDBRIC texture in IFW. If the camera is
- facing the wall with this texture it looks great but as the camera moves
- around and the camera angle becomes more oblique to the wall, the
- texture develops different strobe or flare patterns(which term is
- correct) with different angles; like a striped shirt on television.
-
- Consequently the AVI file looks horrible. This in not a TACKING problem.
- Anyone got any ideas of how to over come this?
-
- ----------------------------------
-
- Date: Wed, 18 Feb 1998 09:50:19 +0100
- From: Torgeir Holm <torgeir@UNION.NO>
-
- What you're experiencing is Moirée, or interference. This happens when
- patterns or lines get really small.. what you need to do is to really crank
- up the Anti aliasing.
-
- ----------------------------------
-
- Date: Wed, 18 Feb 1998 14:31:34 -0800
- From: Edgar Kraft <kraft@CIPS01.PHYSIK.UNI-BONN.DE>
-
- Hi Chris,
-
- as Torgeir mentioned the moirie problem you encountered is exactly what
- happens in TV with the striped shirt: the resolution is too low for the
- alternating details of the brickpattern when it lies in a certain
- distance. So the renderer sometime "sees" the mortar and then (just one
- pixel away) the brick. This gives the strange patterns you encountered.
- Apart form turning up the antialiasing (which doesen't remove these
- pattern entirely - at least with me) you could render at a higher
- resolution instead (e.g. twice-four times the resolution you want) with
- antialiasing turned completely off. Apply Gaussing Blur (with an image
- processing program) at a radius of about half the times you overscaled
- (i.e. 1 pixel if you rendered double resolution) and scale the pic down
- to the resolution your wanted.
- This most often worked with me, gives a nice decent antialiasing and
- could be even faster than rendering with full (second-type)
- antialiasing. -Though it might be a problem with rendering animations...
- You could also try (black) fog or lightning with lightsources that fall
- off in distance. What won't get no light won't flicker.
-
- ----------------------------------
-
- Date: Wed, 18 Feb 1998 14:39:08 +0100
- From: Torgeir Holm <torgeir@UNION.NO>
-
- I remember reading about Real 3D 3.0 or something on the amiga a few years
- ago. It was supposed to have some anti moirée routines in the renderer.
- Have never seen how they work though, maybe someone else on the list knows.
-
- ----------------------------------
-
- Date: Wed, 18 Feb 1998 21:45:35 EST
- From: Phil Cook <Philcook@AOL.COM>
-
- Or render larger and then resize down accomplishing finer antialliasing. I do
- this all the time now when out-putting photo-real animations for video.
- Render at 1280 by 960 then resize to 640 by 480 and at a touch of blur.
- Everything starts to look like original photography. For more realism add a
- touch of grain.
-
- ----------------------------------
-
- Date: Thu, 19 Feb 1998 00:19:13 -0500
- From: Collins <collins@ACCUCOMM.NET>
-
- It will happen on any texture that creates small lines like this, not
- just oldbrick. Upping the AA will help, but you can also try having less
- contrast between the colors of the brick and the mortar, or make the
- bricks larger, or render a larger animation, screen size-wise.
-
- ----------------------------------
-
-