# Need help with pl dynamic´s

##### L1: Registered
I'm working on a payload map which will have a Bridge rotate 90 degrees and go upward to the next level when the cart is at a certain point. Basically, I have no clue what I'm doing with the bridge to make it dynamic, as its just 4 brushes grouped together right now.
thanks!

##### L1: Registered
Or maybe if you give me a link to a tutorial...

#### Davekillerish

aa
Can we see what your talking about? Pictures would help in a case like this

##### L1: Registered
This is the bridge that i want to move.

#### Crowbar

##### Spiritual preprocessor
aa
We do realize what 4 brushes are, thanks.
As for moving it, you'll need func_tracktrain brobably

##### L1: Registered
I see...
And the rotation?

#### Diva Dan

##### hello!
aa
pl_barnblitz has a turning object similar to the one you are thinking of. I recommend you download the decompiled version of it and study the logic. That's all I can think of! It would be a good place to start

#### Crowbar

##### Spiritual preprocessor
aa
If no rotation and such was required, I would suggest a way like func_door. But the move you want to make is complex, so that's why you will need the tracktrain.

##### L1: Registered
Ok thanks
I will look into both of you solutions.

#### killohurtz

##### Distinction in Applied Carving
aa
If you need both rotation and vertical movement, I'd suggest trying a func_platrot. You can tie selected brushes to an entity with Ctrl+T.

#### Crowbar

##### Spiritual preprocessor
aa
Platrot rotates as it moves afaik, while he might need first rotating, then moving (or the other way around), for which a func_tracktrain is good.

##### L1: Registered
Real stupid question. How do I activate the Platrot?

#### killohurtz

##### Distinction in Applied Carving
aa
Platrot rotates as it moves afaik, while he might need first rotating, then moving (or the other way around), for which a func_tracktrain is good.
Even then, a func_door_rotating paired with a func_door/func_movelinear would probably be better. A tracktrain seems too complex and inefficient for the situation.

Real stupid question. How do I activate the Platrot?
You have to send it an input to start moving. For example, if you want the bridge to move when the cart reaches a specific path_track, create an output (OnPass) from that path_track that targets the platrot and tells it to start.