Adobe Director Basics

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ADOBE DIRECTOR BASICS 3D: Controlling action To compare the differences between #automatic and #equal timeStep modes, download and launch the movie TimeStepMode.dir. You may also want to use the fpsMeter MIAW tool, to show the actual frame rate on a real-time basis. See “Performance” on page 387for instructions on how to install this tool. A timeStepMode of #equal handles interruptions better than #automatic The TimeStepMode.dir movie shows two versions of the same simulated scene side by side. The scene simulates a ball the size of a basketball bouncing after it is dropped from the height of a basketball net. Try clicking the Interruption buttons. Both modes will freeze during the interruption. The #automatic timeStepMode simulation will try to catch up after the interruption. Depending on the timing and duration of the interruption, it may lose control of the simulation altogether. (If this happens, click the Restart button). The #equal timeStepMode scene will continue the simulation from the point at which it was interrupted. Try varying the _movie.puppetTempo by dragging the Tempo slider. Notice how the #automatic timeStepMode simulation will adjust well to the new frame duration, so long as the frame rate does not drop too low. The pace of action in the #equal timeStepMode scene will change as the frame rate changes. timeStep To work around this drawback of the #equal timeStepMode, you can change the value of timeStep on each frame. See “simulate()” on page 299 for more details. simulate() To get the Physics simulation to run, you need to call physicsMember.simulate() once per frame. The best event handler to use for this is on enterFrame. See “Using frame events wisely” on page 397 for more details on this event handler. You can make the #equal timeStepMode run smoothly, even when the frame rate fluctuates by altering the value of timeStep to take into account the elapsed time. To avoid the disadvantages of the #automatic timeStepMode, you can ignore long interruptions. The on enterFrame() handler below sets the value of member("Physics").timeStep to the number of seconds since the last update, but it ensures that this value never goes above 0.1. In other words, it ignores any interruptions longer than 100 milliseconds. If the movie's frame rate remains above 10 frames per second (or 100 milliseconds duration per frame), then the Physics simulation will adapt itself smoothly to any changes in tempo. Last updated 8/26/2011 299
ADOBE DIRECTOR BASICS 3D: Controlling action property pLastUpdate on enterFrame(me) vMS = the milliseconds vElapsed = vMS - pLastUpdate pLastUpdate = vMS vTimeStep = min(vElapsed / 1000.0, 0.1) member("Physics").timeStep = vTimeStep member("Physics").simulate() end enterFrame In the TimeStepMode.dir movie, you can test the efficiency of this technique by checking the Adjust TimeStep check box. Physics world properties A newly initialized Physics world has no gravity, and all its other properties are set to minimum values. A Physics world has eight properties whose values can be modified at any time. These values act as defaults for all rigidBody objects for which no value has been set for these properties. gravity (cannot be set independently on individual objects) restitution friction linearDamping angularDamping sleepThreshold sleepMode contactTolerance To explore the properties of a Physics world, download and launch the movie FirstWorld.dir. Last updated 8/26/2011 300
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ADOBE ® DIRECTOR ® BASICS
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Contents Preface Credits . . . . .
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Chapter 1: 3D basics Adobe® Direct
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Chapter 3: 3D: Controlling action F
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Chapter 4: Audio mixers and sound o
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