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☖ Forums → Cog Forum → Position checking?
Position checking?
2003-01-10, 7:44 AM #1
I posted this before, aboud 3 years ago, and I got a good answer from Mohican... I don't expect he's still around, but maybe someone else remembers what I'm talking about. I actually implemented this in a cog and got it work, but I can't find that cog and the forums have been cleaned up since then [http://forums.massassi.net/html/frown.gif]

I want to check if a world position (a point vector) is to the left or to the right of the player's position (anopther point vector, if you will). I vaguely remember something like this... getting the cross product of the player's forward vector with <another vector>, and checking whether that vector's Z value is > 0.26 (don't ask me why).

Any help?
Dreams of a dreamer from afar to a fardreamer.
2003-01-10, 7:58 AM #2
Gethingrvec();
And when the moment is right, I'm gonna fly a kite.
2003-01-10, 8:00 AM #3
I beg your pardon? [http://forums.massassi.net/html/confused.gif]

And explain the math so I won't forget it this ime
Dreams of a dreamer from afar to a fardreamer.
2003-01-10, 8:11 AM #4
Frm the Datamaster:

Quote:
<font face="Verdana, Arial" size="2">
Returns a normalized lookvector looking to the right of the thing's real lookvector. Syntax:

lvec = GetThingRVec(thing);
</font>



On second though, hmm, maybe that wouldnt help you. Someone who is better with vector math should answer this. [http://forums.massassi.net/html/frown.gif]
And when the moment is right, I'm gonna fly a kite.
2003-01-10, 8:28 AM #5
No, that wouldn't help me much [http://forums.massassi.net/html/smile.gif]
Dreams of a dreamer from afar to a fardreamer.
2003-01-10, 11:16 AM #6
Did you see this:

http://forums.massassi.net/html/Forum4/HTML/002089.html

Its an old post of yours. It looks like you figured out HOW to do it, but you just didnt understand why it worked.
- Wisdom is 99% experience, 1% knowledge. -
2003-01-10, 11:41 AM #7
RAAHAA! Thank you! I've been searching for it for the whole day! It never occured to me to search for my own posts, though [http://forums.massassi.net/html/smile.gif]

Thanks!
Dreams of a dreamer from afar to a fardreamer.
2003-01-10, 12:20 PM #8
Code: 
symbols
message    startup
message    pulse
vector     pos
flex       dummy
end

Startup:
   SetPulse(.5);
   Return();

Pulse:
   dummy = VectorX(GetThingPos(GetLocalPlayerThing())) - VectorX(pos);
   If(dummy > 0) Print("left of pos");
   Else Print("right of pos");
   Return();
end

this level cog only relates, if your looking down from above. ie only based on the X axis.

------------------
The Sniper Missions. Current project, The Sniper Missions

The Magician Saber System.
Major projects working on:
SATNRT, JK Pistol Mod, Aliens TC, Firearms

Completed
Judgement Day (HLP), My level pack
2003-01-10, 12:54 PM #9
No, that will work only along the global x axis. If I look along the x (1, 0, 0) standing at (0, 0, 0) then I could have points that are directly in front or behind me but according to your math they'd be on my left/right: (-0.5, 0, 0) and (1.2, 0, 0) for example.

Check yer math [http://forums.massassi.net/html/smile.gif]
Dreams of a dreamer from afar to a fardreamer.

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