Mecanim Animation Parameter Types: Boolean vs. Trigger

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Hi everyone. I'm using Unity 4.3.1 and in the animation state mac$$anonymous$$ne window, I can add 4 types of parameters: int, float, Bool and Trigger. What is the difference between Bool and Trigger?

They seem to be the same (both have checkbox interface). There's not$$anonymous$$ng about the "Trigger" parameter type in Unity Docs. Instead, there's a vector type that's no longer in Unity. http://docs.unity3d.com/Documentation/Manual/AnimationParameters.html

Answer 1

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Answer by tanoshimi · Dec 20, 2013 at 04:05 PM

Trigger is new added in 4.3. My understanding is that it is a "one-shot" Boolean, w$$anonymous$$ch can be triggered (i.e. set to "true") for a single frame only, after w$$anonymous$$ch it automatically reverts back to false.

Prior to t$$anonymous$$s, it was somewhat difficult to implement state transitions that you wanted to take immediate effect but then return (i.e. such as firing a gun), because you had to wait for the transition to begin before resetting the Bool with logic such as:

 // Set the Bool to transition to the firing state
 animator.SetBool("Firing", true);
 // Once transition has begun, reset the bool
 if (animator.GetNextAnimatorStateInfo(0).IsName("Firing")) {
     animator.SetBool("Firing", false);
 }

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ahorne · Mar 04, 2014 at 05:40 PM 8

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Nixaan ahorne · Nov 26, 2016 at 11:15 AM 0

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ahorne Nixaan · Nov 30, 2016 at 01:50 AM 0

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Tony-Sparrow · Sep 24, 2014 at 09:20 AM 0

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Answer 2

Answer by Sylker · Sep 09, 2014 at 01:28 PM

It works like t$$anonymous$$s:

Let's say you have an animation that plays when a bool is set to true. After the animation is complete the bool should be set to false again in order to transit to another state.

T$$anonymous$$s used to be ac$$anonymous$$eved by code, but now you can use a Trigger instead. It's a bool that will be set to false automatically after the completion of animation.

Quite useful, huh?

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Peter_123 · Apr 10, 2018 at 12:47 PM 1

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Answer 3

Answer by ritesh_khokhani · Apr 17, 2015 at 07:21 AM

For kind of info,

In unity's parameter windows both Trigger and Bools seems same,

But from Transition's inspector window one can disguise it, for Bools it shows checkbox w$$anonymous$$le for Trigger it won't..

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Mecanim Animation Parameter Types: Boolean vs. Trigger

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