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11991 Posts in 1587 Topics- by 3509 Members - Latest Member: lioneltenel

27. May 2012, 02:47:57 am
Xith3D CommunityGeneral CategorySupport (Moderator: Marvin Fröhlich)Image Projection Bug?
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kukanani
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« on: 10. January 2008, 02:17:59 am »
This may be due to my strange Graphics card.  The ProjectiveTexturesTest looks great, it will work well for me.  The only problem is that when I increase the spread angle past, say, 18, I start to see some odd blackness, in the vague form of a circle, but it seems multi-layered - certain parts are darker than others.  Look at the screenie.  Again, I think that this is just my graphics card, and I'll live, but is this a bug?

EDIT: Actually, I just realized that this behavior also shows up when my view is very close to the ridged plane.  Look at screenshot 2, where the spread angle is set back down, but the behavior still is there.

EDIT 2:  I have found out that it is directly affected by the distance to the plane.  When I am far away, the behavior does not appear, even with the spread angle very high.

EDIT 3: Whoops, forgot the screenshots  Undecided
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Marvin Fröhlich
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« Reply #1 on: 10. January 2008, 03:10:42 pm »
I guess, this is a bug in your driver or your card again. It works perfectly for me for any view position. Of course the final judgment can only be made after others have proven the testcase.

Marvin
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Mancer
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« Reply #2 on: 10. January 2008, 06:09:07 pm »
Hi !

Just a very very little bug in the testcase...

The "main" function launches the MultitextureTest  Grin
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Marvin Fröhlich
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« Reply #3 on: 10. January 2008, 06:13:08 pm »
Quote from: Mancer on 10. January 2008, 06:09:07 pm
Just a very very little bug in the testcase...

The "main" function launches the MultitextureTest  Grin

Thanks. I have fixed this. Do you know the Xith3DTestLauncher btw.? (Not that this is an excuse for the bug Wink).

Does the testcase work for you? Or do you get the same behavior as kukanani does?

Marvin
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Mancer
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« Reply #4 on: 11. January 2008, 08:58:59 am »
It seems I have the same behaviour than kukanani.

There is some black/grey zones if you are very close or if the angle is changed.
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Marvin Fröhlich
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« Reply #5 on: 11. January 2008, 02:59:42 pm »
Quote from: Mancer on 11. January 2008, 08:58:59 am
It seems I have the same behaviour than kukanani.

There is some black/grey zones if you are very close or if the angle is changed.

What graphics board do you have? Are you sure, you have installed the latest drivers? I hate to ask this, but we need to make this sure.

Marvin
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Mancer
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« Reply #6 on: 11. January 2008, 04:03:48 pm »
My video card is NVidia GeForce 7950GT 512Mo RAM with the latest drivers (169.21)

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I hate to ask this, but we need to make this sure.
No problem!  Wink
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Marvin Fröhlich
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« Reply #7 on: 11. January 2008, 07:18:11 pm »
Quote from: Mancer on 11. January 2008, 04:03:48 pm
My video card is NVidia GeForce 7950GT 512Mo RAM with the latest drivers (169.21)

Well, this card should be sufficient Wink. It is almost the same as my own card. I will test the texture projection code on Windows tomorrow. Maybe this makes the difference.

Marvin
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Marvin Fröhlich
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« Reply #8 on: 12. January 2008, 12:12:48 am »
I have tested the texture projection on Windows. And it looks as you describe. I will try to fix this now.

Marvin
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Marvin Fröhlich
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« Reply #9 on: 12. January 2008, 12:49:35 am »
Projective textures are fixed now.

Marvin
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kukanani
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« Reply #10 on: 12. January 2008, 02:57:58 am »
Yay, they work  Grin.

Thanks, Marvin.
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« Reply #11 on: 12. January 2008, 11:24:32 am »
Looks fine now !  Cool

Thanks again.
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'n ddrylliog
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« Reply #12 on: 12. January 2008, 04:09:48 pm »
What was the problem ?
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Marvin Fröhlich
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« Reply #13 on: 12. January 2008, 04:52:23 pm »
Quote from: Amos Wenger on 12. January 2008, 04:09:48 pm
What was the problem ?

The projected texture had to have the CLAMP_TO_EGDE boundary modes instead of the CLAMP one.

Marvin
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