Adobe Director Basics

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ADOBE DIRECTOR BASICS 3D: Controlling action A simple Physics world with default values for all parameters Use the various sliders and buttons in the FirstWorld.dir movie to test what happens when you modify the values for these properties. Apart from gravity, every rigidBody in the Physics simulation can have its own values for the properties illustrated in the FirstWorld.dir movie. (See “Rigid body properties” on page 311). The values that you set for these properties will apply to all rigidBody objects and terrains for which you have not explicitly set their own values. gravity and dimensions The value that you use for gravity depends on the dimensions of your models. In the FirstWorld.dir movie the Cube has a length, width and height of 1 unit. If you consider 1 unit to be 1 meter, then setting a gravity to vector(0, -10, 0) will give you a realistic simulation. If you consider 1 unit to be 1 foot, then you can use vector(0, -32, 0). Click on the M and FT sprites just beneath the gravity slider to use more scientifically precise values. To simulate gravity on earth, use a value that is about 5 to 6 times the height of an average-sized human character, as measured in world units. (This assumes that you are using the #automatic mode for the simulation). Unless you have a non-zero value for gravity, friction will have no effect on objects lying on top of one another. If you alter the value for gravity, then the effect of friction will also change. To test this, click the Push Cube button. Click the Friction slider bar, to set a non-zero value for friction, then click the Gravity slider to set a negative value for gravity. Only after gravity has been set will the Cube start to react to friction. restitution Restitution defines how much energy is returned to an object after it collides with another. The overall result depends on the restitution values for both bodies. Altering the value in the Restitution slider will affect both the Cube and the Ground. You can set the restitution value for each object separately. This command will set the restitution of the first rigidBody named “Ground” to 0.42. Last updated 8/26/2011 301
ADOBE DIRECTOR BASICS 3D: Controlling action -- Lingo syntax member("Physics").getRigidBody("Ground").restitution = 0.42 // JavaScript syntax member("Physics").getRigidBodies()[1].restitution = 0.42; Testing how the Cube bounces when the value of its restitution changes Test what happens when you alter the restitution of the Ground and the Cube rigidBody objects separately to get a feel of how this property works. Note: Setting restitution to its maximum value of 1.0 can lead to rounding errors where the energy of a bouncing object actually increases. Be cautious of setting restitution above 0.95. friction Friction depends on the force with which two objects are pressed together. To test this, set a non-zero value for both gravity and friction, and then click the Push Cube button. You can see that modifying either gravity or friction will have an effect on the behavior of the Cube. Last updated 8/26/2011 302
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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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ADOBE DIRECTOR BASICS Audio mixers
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Adobe Director Basics

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