Simulate 'wrap' behaviour with physics

Hi,

I want to be able to simulate the 'wrap' behaviour for an object that is being moved using a physics force. I understand that teleporting objects by changing their position directly can cause problems with the physics routines so I am trying the following approach:

• when the object leaves the layout then

- store its current physics velocity in instance variables

- set its physics velocity to zero

- teleport the object to the other side of the layout by setting its position

• if the object has a stored physics velocity then

- set its physics velocity to the stored value

- set the stored value to zero

The problem I have is that including the step in bold above causes the physics velocity to be set to zero after the object has been teleported for some reason. If I disable this step then the object gets the correct velocity following the teleport but the event will keep firing and restoring the stored value.

Theres a simple capx showing my problem here.

As a small tip, you may want to check the ordering of your events and actions.

Thanks for the suggestion - I had already tried moving the events around but it didn't seem to have any effect.

I don't know why the velocity is changing back to zero but try this: capx (r94)

Sorry for the slow reply and thank-you very much for posting that capx.

I can see that you've added an additional test against the player's physics velocity being zero before setting it with the stored value. I can't really see why this is necessary (some quirk of the physics engine perhaps?) but I'm happy it's working.

It says in the manual:

he Physics behavior simulates physics separately to the Construct 2 layout. Construct 2 will try to keep the Physics and Construct 2 "worlds" synchronised if one changes but not the other, but this can be unpredictable.

When you set the physics velocity to 0 it's not updated the very next tick. It seems to take 2-3 ticks before the velocity is actually 0.