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☖ Forums → Cog Forum → A question about ThingViewDot
A question about ThingViewDot
2001-04-05, 12:41 PM #1
When ThingViewDot(a, b) = 0, it means that thing a is facing 90 degrees away from thing b. But it doesn't help me determine which side of thing a thing b is! I'll be more specific: assuming thing a is the player, if 1 is returned, I know the player is facing the thing. If -1 is returned, I know the player has his back to the thing. But if it's 0, I don't know whether the thing is on his right or on his left!

Any ideas how I could check which side things are on?
Dreams of a dreamer from afar to a fardreamer.
2001-04-05, 1:17 PM #2
Check Sniper Arena. It has whether the bullet hit the left part or the right part of the body, meaning if the bullet is existing to the right/left of the body.

Mohican made me this script before.

Code: 
	look = VectorNorm(GetThingLVec(player));
	velocity = VectorNorm(GetThingVel(bullet));
	cross = VectorCross(look, velocity);
	zComponent = VectorZ(cross);

	if(zComponent < -0.6) RArmShot = 1;
	else
	if(zComponent >  0.6) LArmShot = 1;


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http://millennium.massassi.net/ - Millennium
2001-04-06, 12:19 PM #3
Thanks...

Well, I'm sure it works, but could you please explain to me how it works? I like knowing what sort of stuff I put in my cogs... [http://forums.massassi.net/html/wink.gif]

[This message has been edited by Fardreamer (edited April 06, 2001).]
Dreams of a dreamer from afar to a fardreamer.
2001-04-06, 4:26 PM #4
1. Get the normal for the player's look vector (normal is perpendicular line; if player was looking at a wall, it would be parallel)

2. Get the normal for the bullet's look vector.

3. No idea what the crossing vectors does.. I know this is where the 'calculations' occur, which decides whether it's on the left or the right.

4. Get the Z vector of #3's cross.

5,6,7. Basic if: statesments, deciding if the Z vector is large/smaller and sending off the regional damage message or whatever.

Hope that helped a little, maybe Hideki can clear things up (and I didn't make too big a fool out of myself!) [http://forums.massassi.net/html/smile.gif]

-Jipe
2001-04-06, 5:39 PM #5
Jipe thanks!
Actually I don't even still know what the heck was happeining in that part of the cog [http://forums.massassi.net/html/biggrin.gif]

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http://millennium.massassi.net/ - Millennium
2001-04-06, 11:55 PM #6
Thanks Jipe! Actually I used to think the cross vector function returns a shared position, i.e. common point, but that wouldn't make sense, because two vectors don't always cross.

Maybe Mohican can explain... ?
Dreams of a dreamer from afar to a fardreamer.

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