[Anark] Grounded (Physics Behavior)

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发表于 2011-10-21 08:21:00 |只看该作者 |倒序浏览

            Grounded (Physics Behavior)


         Summary


         Forces the parent object to stay a set distance above ground/floor objects.


            Category


            Latest Behaviors


            Author


            Gavin Kistner


            Difficulty


            (Reference)


            Time to Complete


            5 Minutes


         Downloads


         Click Here

         to download the associated files.


         (This document covers version 2.0.4 of the 'Grounded' behavior, current as of 2005-Feb-11)


         Description


         Attach this behavior to an object to cause it to stay at a set height above any objects which have the Collision Shell behavior attached.


         The

            Eye Height

         property controls how far (in world units) above the ‘ground’ the pivot point of the object is placed.


         By default, collision shells are checked for in the negative Y direction; this

            Down Direction

         can be changed under Advanced Properties.


         To use this behavior with one which may alter the height (like the ‘Walk’ behavior), attach this behavior above others on the object. (This will cause the object to first ground itself to any applicable objects, and then the Walk behavior may offset its height from there.)


         The object to which this behavior is attached should be left in ‘global space’; the parent object should not have any ancestors which have been transformed.


         The

            Use Gravity?

         flag takes effect when the object being walked ‘falls’ off an edge

            and

         more ‘ground’ can be seen below. In this case, the object will start to fall (in the

            Down Direction

         ) at a rate specified by

            Gravity Force

         . If

            Use Gravity?

         is not checked, the object will instantly be pulled down to the lower ground plane.


         This behavior is typically used in a multi-level walkthrough presentation, along with Collider for Walkthroughs and either the Fly or Walk behaviors on a Camera.


         Basic Properties


            Eye Height


            Distance above the 'ground' where the object should be kept.


            Start Immediately?


            Start sticking to the ground immediately, or wait for the Start action to be called?


         Advanced Properties


            Down Direction


            Direction in which to check for the ground; defaults to down in the Y direction.


            Down Distance


            Distance from the object to check for any ground.


            Use Gravity?


            Fall off ledges according to gravity, or 'pop' to down?


            Gravity Force


            Acceleration force when falling (in units/second/second).


         Actions


            Start


            Start keeping the parent object grounded.


            Stop


            Stop enforcing the grounding behavior.


            Toggle


            If the object is being grounded, stop it; otherwise, start grounding it.


         Events


            Started


            Fires when grounding is turned on.


            Stopped


            Fires when grounding is turned off.


         Demonstration


            View Demonstration Project


            Download Project File