Eclipse shadows get doubled

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Plummer

Eclipse shadows get doubled

Post #1by Plummer » 08.04.2002, 01:10

At the first I would like to mention that eclipses rendering gives a serious impact on my graphics card. Even when I show up such high polygon satellites as Mir, system gets less slower. I have 128M of memory and 16M Riva TNT2.

Another a real *bug* is eclipses rendering:
at this particular moment: 2593-03-02 03:22:09 UTC
when you will take a look at Jupiter, you will notice two shadows of a same satellite on night and day sides of the planet, which move into one point. At about 03:22 they collide and disappear. If you will run time back, you will see how the shadows appear from nothing and start moving on the planet surface.

Rassilon
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Post #2by Rassilon » 08.04.2002, 07:57

I was just about to post this bug as well...

I am getting the same thing with my GeForce 3 Ti200 under XP...Using Celestia ver 1.2.4...

Here is a sample clip I took to show well our problem...

http://cybermindtraveller.freewebspace.com/files/sample2.avi

^^ DivX rendered video for anyones interest...
I'm trying to teach the cavemen how to play scrabble, its uphill work. The only word they know is Uhh and they dont know how to spell it!

Matt McIrvin
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Ambient light

Post #3by Matt McIrvin » 10.04.2002, 23:35

You can only see the extra shadow if there is some ambient lighting. Since the ambient lighting is non-physical to begin with, I suppose it could be argued that there's technically no correct way for it to look.

On the other hand, in some cases ambient light could be seen as simulating backscatter from some other object. And if there's some easy way to get rid of the extra shadow-- say, by somehow applying ambient light after the eclipses have been computed-- that would be desirable.

Laahel
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Post #4by Laahel » 11.04.2002, 11:41

hello again people ...

it'seem you're talking about the "twin shadow" problem i spoke of time ago ( with the apearance of eclipses shadows ;p)

its like to appear with any graphic cards if you set an ambient light...

maybe chris can tell us more about that...

byyye

chris
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Post #5by chris » 11.04.2002, 17:52

Laahel wrote:hello again people ...

it'seem you're talking about the "twin shadow" problem i spoke of time ago ( with the apearance of eclipses shadows ;p)

its like to appear with any graphic cards if you set an ambient light...

maybe chris can tell us more about that...

byyye


Yes, this problem will occur with any graphics card when ambient light is enabled. I'll work on a fix for it once I solve the crashing bugs. Let me apologize again for not making much progress lately. I've been away from home for 10 days, and just started my new job at nVidia on Monday. I hope to find some time this weekend to fix the crashing bugs and release an official 1.2.4 version of Celestia.

--Chris

Rassilon
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Post #6by Rassilon » 11.04.2002, 19:40

chris wrote:
Laahel wrote:hello again people ...

it'seem you're talking about the "twin shadow" problem i spoke of time ago ( with the apearance of eclipses shadows ;p)

its like to appear with any graphic cards if you set an ambient light...

maybe chris can tell us more about that...

byyye

Yes, this problem will occur with any graphics card when ambient light is enabled. I'll work on a fix for it once I solve the crashing bugs. Let me apologize again for not making much progress lately. I've been away from home for 10 days, and just started my new job at nVidia on Monday. I hope to find some time this weekend to fix the crashing bugs and release an official 1.2.4 version of Celestia.

--Chris


Dude this is free software...I am glad I even have this for nothing...Take your time...I wait in anticipation to what new stuff your adding! :mrgreen:
I'm trying to teach the cavemen how to play scrabble, its uphill work. The only word they know is Uhh and they dont know how to spell it!

Matt McIrvin
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Joined: 04.03.2002
With us: 22 years 6 months

Congratulations

Post #7by Matt McIrvin » 13.04.2002, 02:42

chris wrote:I've been away from home for 10 days, and just started my new job at nVidia on Monday.


Congratulations on your new job!

Sum0
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Post #8by Sum0 » 13.04.2002, 08:11

I hope this doesn't mean that Celestia will only support nvidia cards? :D
"I have been asked, 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question."


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