Aim Control on Tank Turret

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  01 January 2006
Aim Control on Tank Turret

Hi All,

I've been rigging up a standard tank, one with rotating turret with a barrel that aims up and down independently of the turret.

The barrel is parented to the turret. I set up 2 aim constraints. One on X for the barrel, for aiming up and down and another constraint in Y for the turret. It seems to work generally, but the barrel and/or the turret seem to flip out in different quadrants of a test 360'. I've tried am the aim vectors attributes etc in the constraints but none work the whole way around.

Is there a small fix to this, or is there a better way to rig a turret up?

  01 January 2006
There are many ways to rig this, but are you really sure you need all those constraints? You could just easily create two controls one for the X control of the barrel and the other Y of the turret. Pretty much simple FK animation.

If I were to rig an aim control version, I would create a simple two joint skeleton down the length of the barrel (starting at the center of the turrent). Create a single chain ik. Create an aim locator, point constraint ik handle to locator. Connect Y rotations to barrel, X rotation to turrent. Now you can move the locator around as you wish. I find this method much safer than aim constraints because of flipping.

Hope this helps,
  01 January 2006
Thanks, I'm goign to go for the two controller method. It just seemed so close to working with the dual constraints.
  01 January 2006
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