I have 2 tracktrains, first is moving a straight line, second should be moving to first tracktrain. But I am facing a problem were path_tracks don't parent to a moving object, instead, second tracktrain moves to the middle of the map ( the center of the map ).

// From Valves wiki, path_track doesn't parent to a movable object.
Is there a way around this or I am busted with this?

Like you read, it's not possible to parent the path_tracks. I remember I even tried one time disabling the SmartEdit and adding the keyvalue "parentname" to no avail.

I'm not sure exactly about what you are attempting to achieve, but if I think in 2 dimensions I can always make it by making the 2nd train to follow up a diagonal line (but at a higher speed than the first train) like so:

What you could alternatively do is this:

• Make your second moving thingie (brush, entity, whatever...)
• Parent it to a func_door entity. Make the func_door brush the size you wish according to the movement you want your moving thing to describe.
• Parent the func_door to your first tracktrain, and make the door to open whenever you want.

Example:

I hope that helped.

This is the full plan I want:
I am trying to make a horror map with similar expects of the games monster SCP-173. While the player doesn't look at the object, it gets closer to player.
As npcs don't work in Portal 2 as well they don't move so fast. I tried making a tracktrain mechanism and it almost working... just the part where actually going to a player doesn't.
I though point_teleport might solve my problem by teleporting path_track to a player in some periods of time, but... point_teleport doesn't parent as well...

Hmmmm... if I got your meaning right, the only real way to achieve what you want is Vscripting, since you need to update every once in a while your moving object position in accordance to the player's position.

I might feel capable of giving you a hand on it despite of my limited scripting knowledge... if you allow me a reasonable time (I'm top busy lately). Basicly the idea would be:

• You get the player's position, a vector.
• You get your moving object's initial position, another vector.
• You set as the new position for your moving object some point between its original position and the players' position X units away from any of them and every X seconds, only when the player is not looking at the moving object. This can be made by means of a trigger_look parented to the moving object and a basic script.