[Anark] Ghost Trails (Special Effects Behavior)

[复制链接]

Asen

867 主题	0 听众	1万积分

外协人员

Rank: 7 Rank: 7 Rank: 7

纳金币: 17488
精华: 1

电梯直达

楼主

发表于 2011-10-8 14:50:00 |只看该作者 |倒序浏览

         Summary


         Causes the parent object to leave a trail of 'ghosts' behind it as it moves.


            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 1.5.2 of the 'Ghost Trails' behavior, current as of 2005-Aug-04)


         Description


         Attach this behavior to an object to cause

            ghosts

         to follow it as it moves around the screen. Each ghost is a copy of the object, with (by default) decreasing opacity and scale.


         The

            Number of Ghosts

         property controls how many ghosts are created and moved around.


         Each ghost matches the position, rotation, and scale of its predecessor. (But see the

            Ghost Scale

         property below.)


         If

            Hide When Atop?

         is checked, the ghosts will disappear (opacity 0) when they are sitting exactly on top of the parent object. (This prevents ‘blurry’ results when the ghosts catch up to the object.)


         The

            Start Opacity

         and

            End Opacity

         properties control the opacity of the ghosts; the first ghost to follow the parent will have the opacity of

            Start Opacity

         , and the last ghost will have the

            End Opacity

         . These opacity values are scaled by the opacity of the parent; if the parent has an opacity of 80 and the

            Start Opacity

         is set to 50, the first ghost will have an effective opacity of 40.


         The

            Ghost Scale

         property affects the scale of each ghost. A value of 1 causes all ghosts to be the same size as the parent object. A value of 0.9 means that the first ghost will be 90% of the parent’s size, the second ghost will be 81% (90% of the size of the first ghost), the third will be 73%, the fourth 66%, and so on. Values greater than 1 cause ghosts to become increasingly larger than their parent (an interesting effect).


         The

            Frames to Skip

         property delays each ghost from following its predecessor. With the default value of 0, the first ghost will follow the parent immediately. With a value of 10, the first ghost will be placed wherever the parent was 11 frames ago (skipping 10 frames), the second ghost will wait 10 frames before moving to where the first ghost was, and so on.


         This effect works particularly well when used in conjunction with the Draggable or Follow Mouse behaviors, but the object does not need to be controlled by the user to leave trails.


         Basic Properties


            Number of Ghosts


            The number of ghost objects to follow around the original.


            Start Immediately?


            Start showing Ghost Trails immediately, or wait for the Start action to be called?


         Advanced Properties


            Hide When Atop?


            Hide the ghost objects if they are directly on top of the parent?


            Start Opacity


            Opacity of the first (closest) trailing object.


            End Opacity


            Opacity of the last (farthest) trailing object.


            Ghost Scale


            The amount to reduce/expand the size of each ghost by.


            Frames to Skip


            The number of frames to skip between each ghost.


         Actions


            Start


            Start showing ghost trails.


            Stop


            Stop showing ghost trails.


            Toggle


            If ghost trails are showing, stop showing them; otherwise, turn them on.


         Events


            Started


            Fires when ghost trails are turned on.


            Stopped


            Fires when ghost trails are turned off.


         Demonstration


            View Demonstration Project


            Download Project File