Randomly rotate a non-moving actor

Fang

Hey all

I'm having a bit of trouble again (and I bet the solution is really simple again, but I can't seem to figure anything out).
I have an actor that I want to rotate counterclockwise at a speed that changes to a random(200,400) every second. I also want other actors to be able to collide with it.
For the rotation, it needs to be movable. But if it's movable, and another actor collides with it, it slides away.
How do I make it so that it can rotate, but doesn't move on collide?

Thanks,
~ Fang

gyroscope

Hi, I had trouble with this in one of my projects: still the rotating actor moved with collision, no matter how high its Density/Friction/Drag was, zero restitution as well.

A workaround is the following (which I haven't tested yet though, but can't see why it shouldn't work): two integer attributes, one has the x value of the actor, the other the y value, called Actor1 x and Actor 1 y. A third and fourth real attributes, lets call them A1 ConX and A1 ConY; in Rules, Two constrain behaviours to the rotating actor. and Rules: when A1 ConX does not equal Actor1 x, change attribute Actor1.position.X to Actor1 X. Same for Y.

Yarik

even if the difference in densiti 1000000, actor still slightly shifted

create an additional actor ...actorX (invisible or behind the scenes)
actorX rotates as you want
constrail actorX.Rotation to game.actorXRotation
and constrail game.actorXRotation to self.Rotation fixed actor

Fang

@Yarik
Your method seems easiest, thanks a bunch.

But is there really no simpler solution? Find it kind of odd that disabling actor movement also disables rotation, seeing as how rotating doesn't change its location...

Yarik

really strange, because there are 2 separate attribute (Fihed Rotation And Movable)

always happy to help

Fang

@Yarik: but that's the whole point: it won't rotate unless movable is checked, and thus it moves when it collides with another actor.