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DarkBASIC Discussion / whats a decal?

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Zotoaster
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Posted: 31st Jul 2005 00:07
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in all the games that come with darkbasic they (iced and tank etc) they all have an array called decal or decallimit or something.. what do they mean? what are they for?

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NanoBrain
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Posted: 31st Jul 2005 02:02
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Zotoaster,

Decals are 3d planes, which set on the surface of an object, as to look like it has changed the objects texture somewhat. Ever seen bulletholes created when shooting a gun at a wall in an FPS? Those bulletholes are each a small 3d plane, setting up next to the surface of the object.

Decallimit might define how many decals can show at one time. A decal is an object, and eventually, if the number of decals to be shown were limitless, they would eventually hit the system performace, due to so many calculations needing to be made. Therefore, decal planes are looped. That, once the last decal is made visible, then the decal system loops, and the first decal in the array is displayed where the next bullet is shot, and so on.


+NanoBrain+
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Zotoaster
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Posted: 31st Jul 2005 02:19
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ahh, cool now i get it, thanks nanobrain

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Metrion
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Posted: 31st Jul 2005 02:55
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Actually, NanoBrain, I used bullet holes in my game and called them decals... about 200 decals, I made...

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NanoBrain
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Posted: 31st Jul 2005 04:43
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Metrion,

I never stated a specific limit. However, I did state that if the decal count was without limits, then eventually, differing from system to system, there would be a performance hit. I am sure that 200 decals are fine for most systems nowadays. But, this does depend on the amount of other calculations needed to run the game, also.


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blanky
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Posted: 2nd Aug 2005 23:03
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Also, the size of the texture being applied to the planes would affect performance, too. (A neat way to speed up your program if you need lots of decals).

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Uncle Sam
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Joined: 23rd Jul 2005
Location: West Coast, USA
Posted: 3rd Aug 2005 02:54
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So that's what they are!

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Uncle Sam
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