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Bullets,lead,pellets.how?

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Hi all it''s been awhile. And i''m back with another newbie question. *celebrations*. How are bullets in 3d games written? I mean it sounds simple enough but, is it and actual projectile with volocity and a collision check or is it just a vector that is writen: "if anything is in that line it would be hit" ?. I would much rather if someone that actually knows the answer to explain *not someone that think they know.*Or if there are any demos or tutorials on how this works plz point me to it. . Thx. If a turkey spots you in the middle of the night, HIT THE DIRT !!!

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Its a line with a timer if im not mistaken, a simple line would be hitting people who moved into that line after a real bullet would have passed, so as far as i know, the best way is with a line and a timer to determine where on the line it is

-Dan

Yes I realize im a n00b...

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Well, that is a hack that works, but not very accurate.

Bullets have different sizes, think of the difference between a rifle or a shotgun, or a lazer etc.

It''s not very hard to mimic a bullet, just make a sphere representing its'' size (smaller sphere for a rifle, larger for a shotgun) and make it travel along the initial position (usually the players position) + a velocity.

To figure the vector, you can do 2 different things.

1. If you want to look at the target, simply use the Look vector in your view.

2. For a sight of some sort that you move around, use that vector-position.

The velocity is based on how fast you want the bullet to travel.

A Bigger sphere has a higher chance of hitting the target(in the case of a shotgun) but has a smaller velocity.

One more thing to take into account is how far a bullet travels, You can do this with a simple multiplier, that shrinks over time.

FOR EXAMPLE HERE, say a bullet starts out at 500 feet/sec. and for every second it loses 100 feet/sec speed.

You would simply multiply that modifier by the velocity vector.

So finally you would have BulletPosition=Origin+(NormalizedVelocity*Speed);

NOw, sometimes you see in games where the "bullet" misses and sticks in the wall? THis is simply (usually) a texture overlay.

Hope this answered some questions!
-Rhone

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Yes. Thanks for these two replies. I just thought it was something I had to know. This question realy arised after playing unreal tornament with a sniper riffle. I made me wonder. lol. Well I have a few weeks off.. so my main goal is to try and learn dx or opengl and make a simple test scene with a target.I''m going to need alot of help with this. I''m looking into buying a couple of "new" books. but are there any with examples or tutorials of bullets. If not online? I checked here already but couldn''t find any on the topic. Any help would be greatly appreciated.
Oh and btw, have anyone played "Shadow force ''Razor Unit''? . Those bullet effects are awsome. The sounds are accurate and it makes a very cool suspence when you play. Anywho... that all i have to say now.

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