Random only up and down direction actor

aitor010

Hi!
How is possible make an actor that can use random up and down direction every 0,5 seconds???
I make an Time every 0,5 seconds but in directions what have I put (is a behavior "Move")?

Thanks in advance!

KevinCross

Move, Change Attribute, Constrain Attribute or Interpolate would all work

Socks

Direction: (left and right)

Random (0,1) * 180


. . . . . . . . . .

Direction: (up and down)

(Random (0,1) * 180) + 90

. . . . . . . . . .

aitor010

hi!
Thanks by reply @KevinCross and @Socks , I have this:
http://s2.subirimagenes.com/imagen/previo/thump_869535420131113-18.png
And not run... What I do bad?

tatiang

So surprised you didn't use sin/cos, Mr. @Socks.

aitor010

@tatiang how can I do the good expression?

KevinCross

That expression in your screenshot is meant to go in the direction box, not the speed one.

aitor010

Gamesalad show me an error in screen when run the game: http://s2.subirimagenes.com/imagen/previo/thump_869540120131113-19.png

The expression is: (Random (0,1) * 180) + 90

I change the expression of sped to direction (was a wrong)

KevinCross

Remove the space between random and the brackets, and maybe make it lower case, although it may not be case sensitive

aitor010

same error I test with: (Random(0,1)*180)+90

KevinCross

Like I said try lower case r, and also make sure you're typing it in the black expression window by pressing the e button, and not straight in the text box.

It also helps if you understand what it's doing before you put in someone's suggestion as you'll never learn, and will never be able to modify it without breaking it.

aitor010

ok, problem solved, not show error display but my actor not move.... I write expression type to type click on random and after the numerics.... but not run....

tatiang

I noticed that if I put the random expression in the Direction field, the actor doesn't move but if I use a separate attribute it works. Try this:

Socks

So surprised you didn't use sin/cos, Mr. @Socks.

@tatiang

I was very tempted to ! In fact if I wanted an actor to move randomly up and down I'd use sin/cos simply because you can get a nice dampening effect when you change direction, rather than a sudden sharp direction change.

Socks

I noticed that if I put the random expression in the Direction field, the actor doesn't move but if I use a separate attribute it works. Try this:

Yep, that works perfectly.

I don't think you need the initial change attribute (direction to 270°) it works fine without that ?

tatiang

@Socks, the initial change attribute is simply because by default the value of that attribute is 0, which moves the actor to the right instead of up or down.

Socks

@tatiang

@Socks, the initial change attribute is simply because by default the value of that attribute is 0, which moves the actor to the right instead of up or down.

Ah! I understand now !

(I quickly copied your set up, but I just entered 90° as the initial attribute value)