find parent object's collision

Unity Engine
1

hi!
I’m trying to do something like the pitcture displays and for many reasons I’m avoiding to use rigidbodys and physics. There are also no character controllers attached to the player, just a sphere collider.

Assuming I control the hammer rotation with a simple input lef-right, I’m trying to stop the rotation of the hammer when it reach the pawn.

I had no trouble with planar moving and colliding (and whatever that matters with the plane), but with rotation and particularly with eccentric rotation I find some problems to get a collision.

I tried a controller based on triggers, but it does’t work well…

Every suggestion is well accepted!

tx

507322--18007--$hammer_trouble.png
507322--18007--$hammer_trouble.png771×1152 113 KB

2

Hello there!

Okay, if you want to do this without rigidbodies and physics then using triggers sounds like a reasonable idea.
I presume you do your rotations in the update function, so adjust your rotation script to include this functionality:

private int mLastRotationDirection;
private int mLockedRotationDirection = 0;

void Lock(bool lock)
{
    if(lock)
        mLockedRotationDirection = mLastRotationDirection;
    else
        mLockedRotationDirection = 0;
}

void Update()
{
    if(Input.GetKey(KeyCode.LeftArrow)  mLockedRotationDirection != -1)
    {
        mLastRotationDirection = -1;
        // Your rotation code
    }
    else if(Input.GetKey(KeyCode.RightArrow)  mLockedRotationDirection != 1)
    {
        mLastRotationDirection = 1;
        // Your rotation code
    } 
}

void OnTriggerEnter(Collider collision)
{
    if(collision.tag == "StopHammer")
        Lock(true);
}

void OnTriggerExit(Collider collision)
{
    if(collision.tag == "StopHammer")
        Lock(false);
}

However you might encounter a problem: without a rigidbody attatched to the hammer collision events probably will not fire. You can solve this by adding a rigidbody to your hammer, disabling gravity and set it to IsKinematic.

Oh, and don’t forget to add a “StopHammer” tag to your unfortunate guy who will endure the wrath of the hammer!

P.S: I seem to recognize this art style, are you by any chance working with MrSpeedWagon?

3

Thanks a lot! script works well and now we can proceed with our game (yes, I’m with mr-speedwagon)

since the collision doesn’t work with object rotating instead of translating, you think is possible to use a system based on triggers for achieve a physic-like collision system? (sorry for the dumbness)

tx!