sighttrace command and other

Tropheus · Post by **Tropheus** » Wed Sep 24, 2003 10:37 pm

Hello everybody !
Sorry for this stupid questions. but i have seen on bjarne tutorial this sighttrace command. But i don't anderstand what it means. I have looked at your others topics, but i didn't anderstand anymore.

If somebody could explain me how can i use it. what are its effects on game.

Secondly
when bjarne speak about self object in his tutorial.

Automatically started scripts
self is NULL for level scripts. Self is the character for animation scripts.

How do you think i can translate "character" in french ?

Thanks for your answers.

Tropheus

Alcoholic · Post by **Alcoholic** » Wed Sep 24, 2003 11:07 pm

Hmm, don't know french, but character is like the guy we are talking about, for example, if I made a story, and I was the leader of a group of men in the book, I could be the 'main' character.

nuggets · Post by **nuggets** » Thu Sep 25, 2003 12:10 am

sighttrace follows a players position

when using self it talks about the entity using the thread

so if

$player thread test

test:
self action //not a real command

the $player (who is self) would perform the action

The Jackal · Post by **The Jackal** » Thu Sep 25, 2003 5:13 am

So what would be the difference, if I were to do it like this:

Code: Select all

$player thread test

test:

$player action

Wouldn't it be the same? Why would SELF be needed?

PLease expand upon this somemore.

tltrude · Post by **tltrude** » Thu Sep 25, 2003 5:26 am

"self" is used as a common name for multiple entities. You would only need to make one thread/script instead of many. It is used a lot in the global scripts.

In your little example, you can leave the first "$player" out and it would still work. But, what if you wanted more than one targetnamed entity (character) to do that same action?

Post by **jv_map** » Thu Sep 25, 2003 5:56 am

The sighttrace command is used to check visibility between two given positions, and will return 1 when the first position can be seen from the second (or vice versa

) and will return 0 otherwise. The final parameter sets the number of entities ignored in the sighttrace (awkward

).

Anyway, here is a usage example:

Code: Select all

local.cansee = sighttrace (0 0 0) $player.origin 128
if(local.cansee == 1)
  iprintln "Player cansee (0 0 0) !"

Or:

Code: Select all

if(sighttrace (0 0 0) $player.origin 128)
  iprintln "Player cansee (0 0 0) !"

Tropheus · Post by **Tropheus** » Thu Sep 25, 2003 7:21 pm

Hi everybody !

Thanks a lot for your answers.

For the "self" expression i understand.
it looks like a variable wich can works for several entity as differents elevators working with the same thread.

For "character" is the "AI german soldier for example" because in french, you can translate it by "alphanumeric signe" as "a" "b" "1" and so on.

But for the sighttrace commande it looks like very difficult to use.
In fact i think to understand that is the way between 2 positions. the first entity can seing another one!
Is it the command used in normandy map to order the plane to bomb the flak when you get the binoculars?
But what is the real interest to use this command ?
Do you use it in multiplayer or solo maps ?
How do you define the number of entities ignored ???

Is it really an important command ???

Sorry for these stupid questions ?

Tropheus

Tropheus

Post by **jv_map** » Fri Sep 26, 2003 6:08 am

Binoculars work a little different but internally use the same concept basically.

You can for example use sighttrace when you're scripting a tank and want to know whether the tank can hit you or not.

Anyway it's generally better to decide what you want to script first and then find a suitable command, rather than the other way around