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How do i lock out a axis

I am making game that is a top down 2-d game. I only want things to move in x and z, keeping anything from going to y. The problem is, i have the AI set on a waypoint system that uses rigidbodies, and some times when either myself, or other enemies collide with a enemy, it knocks them up or down in the y axis, making them impossible to shoot and kill yet they can still hit me, as they are scripted to aim in all 3 axis which is fine as it is universal and looks cool.

So the bottom line is, how can i lock the objects in x and z and out of y. My thought was to have it keep resting it's y axis every frame in the update function, but i have no clue how to do that, and i fear it would either look jumpy, or make it lag a lot.

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asked Feb 13 '10 at 07:39 PM

xToxicInferno gravatar image

xToxicInferno
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the best way is to use a configurable joint and lock the motion in y axis. you can do something like this in update with

transform.position.y=0;

but using joints is the correct way.

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answered Feb 13 '10 at 08:18 PM

Ashkan_gc gravatar image

Ashkan_gc
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Well i tried the joint, and all that does is make it so when i run into a enemy they fly up into the air, then back down to their usual height. I also locked Y motion and angular y motion.

Feb 13 '10 at 08:26 PM xToxicInferno

@Ashkan, one minor point - that's Javascript. In C# you can't assign to Y, you have to do: transform.position = new Vector3(x, 0, z)

Jun 27 '10 at 06:28 PM Cyclops

yes! in C# structs are paased by value so the reference of a vector3 will not be paased and you should get it's reference if you want to set it that way

Jun 28 '10 at 03:09 AM Ashkan_gc
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asked: Feb 13 '10 at 07:39 PM

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Last Updated: Feb 15 '10 at 08:14 AM