How do I pick multiple instances randomly ?

Hey !

i know that there is a lot of subjects about it but i didnt find my solution.

I have 4 towers who spawns bullets each second.

But i want to pick two of them at start of the game, randomly.

I tried to use " pick random instance " and duplicate it two times.

But sometimes, the same one is selected two times.

So, the game pick only one tower.

How can i force the game to pick two different ones ?

thanks !

You could have a variable on the tower to tag that it's been chosen then when you say pick a random instance set the variable to true, and each time pick a random instance where the variable is set to false.

Another way that is useful in some situations is:

For each sprite ordered by random(1)

— do stuff

— compare: loopindex=1

— — stop loop

Does the random(1) here mean that it will go through that loop twice? (Since it starts at 0) I didn’t know that there was embedded logic in the Pick Instance that carried loop counts, I would have though you had to call a loop for that

The random(1) expression causes the “for each ordered” to loop over the instances in a random order. The loopindex is 1 when it’s on the second instance.

Another way that is useful in some situations is:

For each sprite ordered by random(1)

— do stuff

— compare: loopindex=1

— — stop loop

i dont understand that as " event system "

compare what ?

if i compare is my boolean is true, when it picks randomly, it can pick the same one.

It doesnt spawn a sprite, but the same tower is picked

It’s system->compare two values

With loopindex as the first value and 1 as the second.

Play with random suggested by ROjO: dropbox.com/s/q9stpe76oip69yn/loop_random_slider.capx

[Warning ~ it will hipnotize your eyes]