Distance between 2 objects. - GameCreators Forum

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Butter fingers

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Joined: 20th Mar 2006

Location: Mecca

Posted: 28th Jun 2007 22:17

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Hey, I'm trying to get the distance between 2 objects. I know I could raycast it, but I'm using about 30 enemies, and so having them constantly raycasting to test the distance between them and the player isn't going to work.

THe enemies only have melee attack, and therefore don't need to find range, as they freeroam until the player is too close.

I'm currently using

+ Code Snippet

function enemydistancometer(num)
for i=100 to 100+num
   oldx# = object position x(i)
   oldy# = object position y(i)
   oldz# = object position z(i)
   Ooldx# = object position x(2)
   Ooldy# = object position y(2)
   Ooldz# = object position z(2)

   if oldx#<Ooldx+5 and oldz#<Ooldz+5 and oldx#>Ooldx-5 and oldz#>Ooldz-5 then enemy_state(i-99)=3
next i

object i is the enemies and object 2 is the player.

Any ideas?! Help would be greatly appreciated.

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Gil Galvanti

19

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Joined: 22nd Dec 2004

Location: Texas, United States

Posted: 28th Jun 2007 22:23

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Distance formula? It might be slow, but it's all I can think of.
sqrt( (x2-x1)^2 + (y2-y1)^2 + (z2-z1)^2 )

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Code Dragon

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Joined: 21st Aug 2006

Location: Everywhere

Posted: 28th Jun 2007 23:52

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If you square the value you're checking the distance against instead of square rooting the result of the calculation you will gain a lot of speed.

You never really know a person until you look at their google autocomplete entries.

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Johaness

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Posted: 29th Jun 2007 00:47

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http://forum.thegamecreators.com/?m=forum_view&t=83409&b=1

The link is to a function collection thread. Riidii has some nice distance calculation functions.

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Brain111

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Joined: 5th Feb 2007

Location: In my own little world.

Posted: 29th Jun 2007 07:05

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to approximate distance, alot of times I use:

distance# = abs(x1 - x2) + abs(y1 - y2) + abs(z1 - z2)

If accuracy isn't super important, you can use this because it's pretty much the fastest that measures in 3 dimensions.

If you're using a code like "if distance# < whatever....", this produces an octahedron(i think thats what those are called) rather than a sphere. I use it if I have to make a ton of calculations in one loop so I don't lose any speed.

Anarchy Burger - hold the Government!

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Daemon

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Joined: 16th Dec 2005

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Posted: 29th Jun 2007 23:01

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I can't test this because I don't have DBP on this computer. But I use something like this.

+ Code Snippet

null=make vector3(1)
null=make vector3(2)
`You would do all of the making objects and stuff here.

set vector3 1,object position x(player),object position y(player),object position z(player)

for i=firstenemyobject to lastenemyobject
   set vector3 2,object position x(i),object position y(i),object position z(i)
   subtract vector3 2,1,2
   dist#=length vector3(2)
   `And now dist# should be the distance from the player to the current enemy
next i

[center]Insanity is just a state of mind.

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