Angle of direction and rotation? Am i correct?

RHRH Member Posts: 1,079
edited November -1 in Working with GS (Mac)
I really hate posting for help as I prefer to figure stuff out on my own, but after a long time searching the forums and testing ideas I can't figure it out.

I was wondering how to make an actor rotate to the direction that it is travelling. I saw vectorToAngle mentioned a lot but I'm not too sure what that does. I also guess that I will probably have to use a timer.

Am I correct in thinking that this will calculate the direction of travel:

asin( self.Motion.Linear Velocity.X / self.Motion.Angular Velocity )

I'm assuming that asin is short for arcsin or inversesin

If this is correct can I do something like this:

Timer: every 0.1 seconds

Roate to angle:asin( self.Motion.Linear Velocity.X / self.Motion.Angular Velocity )

I tried that but it didn't go too well, just rotated a bit in a direction that clearly wasn't where it was travelling and didn't do much good at all.

Any help is appreciated, Thanks

Comments

  • SingleSparqSingleSparq Member Posts: 1,339
    I too am looking for the answer to this - from an overhead position, using joystick control I want the actor to rotate and face the direction it's going. I have scoured the forums and demos but have not found the answer. Anyone?
    Warning There was an error rendering this rich post.
  • SingleSparqSingleSparq Member Posts: 1,339
    SingleSparq said:
    I too am looking for the answer to this - from an overhead position, using joystick control I want the actor to rotate and face the direction it's going. I have scoured the forums and demos but have not found the answer. Anyone?

    Edit - Sorry hit the wrong button there

    Warning There was an error rendering this rich post.
  • scitunesscitunes Member, Sous Chef Posts: 4,047
    If you are using the joystick demo as a starting point the beach ball travels at the angle determined by the joystick (they call it game.angle). So all you need to do is use a constrain behavior in the main player.

    constrain self.rotation to game.angle. The player will always face in the direction the joystick is making it travel.
  • SingleSparqSingleSparq Member Posts: 1,339
    Thanks scitunes - I will give that ago.
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  • ckck Member Posts: 224
    I'm looking for something similar. If a free-floating actor is travelling a particular direction (on x, based on a collision), then another actor tilts in that direction. How can I track the direction of an actor?
  • BarkBarkCoBarkBarkCo Member Posts: 1,400
    Constrain the rotating actor's self.rotation to a game.angle attribute. Then, any time you need to see the actors angle, just reference the game.angle attribute that data is stored in.
  • RHRH Member Posts: 1,079
    Oh, forgot about this :)

    I don't know what i was thinking when i started trying to use my maths knowledge,

    Here is what i did if anyone still (or in the future) wants to know:

    constrain attribute: self.rotation to (vectorToAngle( self.Motion.Linear Velocity.X , self.Motion.Linear Velocity.Y ))-90
  • StormyStudioStormyStudio United KingdomMember Posts: 3,989
    RH said:
    Oh, forgot about this :)

    I don't know what i was thinking when i started trying to use my maths knowledge,

    Here is what i did if anyone still (or in the future) wants to know:

    constrain attribute: self.rotation to (vectorToAngle( self.Motion.Linear Velocity.X , self.Motion.Linear Velocity.Y ))-90

    Is this still the most efficient way of doing rotate to direction travelling? or is there a way that does not involve constrain... (I'm always trying to reduce Processor usage)...

    Although it does work perfectly (thatnks for sharing with me from the future)
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