Adobe Director Basics

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ADOBE DIRECTOR BASICS 3D: Controlling action vForceExertionMode = #kBoth vRestLength = 17.23 vSpring = member("Physics").createSpring(vSpringDescriptor, vForceExertionMode, vRestLength) trace(vSpring) -- spring("spring") trace(vSpring.constraintType) -- #spring trace(vSpring.flags) -- #kBoth trace(vSpring.restLength) -- 17.2300 Properties: differences and similarities Because they all require a ContstraintDesc object for their creation, all joints and springs have a shared set of properties: name, objectA, objectB, pointA, pointB, stiffness, and damping. They also share a constraintType property, which takes the value #angular, #linear, or #spring. Each constraintType has other properties to define its type-specific values. Angular joints and linear joints have a properties property, which is a property list. trace(vAngularJoint.properties) -- [#length: 23.5900] trace(vLinearJoint.properties) -- [#axis: vector( 0.9598, 0.0499, -0.2761 ), #angle: 56.0000] Attempting to access the non-existant properties property of a spring will lead to a script error. For a spring, you must use the flags and restLength properties. trace(vSpring.flags) -- #kBoth trace(vSpring.restLength) -- 17.2300 Configurable properties For angular joints and linear joints, you can only change the values of the stiffness and damping properties. All the other properties are get-only. If you try to change the value of one of these other properties, a script error occurs. See “Angular joint properties” on page 334 and “Linear joint properties” on page 335 for more details. For springs, you can set the values of all the properties except name and constraintType. See “Spring properties” on page 336 for more details. Accessing joints and springs You can use the function physicsMember.getConstraint() to obtain a reference to either a spring or a joint as shown below: trace(member("Physics").getConstraint("angular")) -- constraint("angular") trace(member("Physics").getConstraint("linear")) -- constraint("linear") trace(member("Physics").getConstraint("spring")) -- spring("spring") Conversely, the physicsMember.getSpring() function will return a reference to a named spring, but will fail to find any constraint objects. Last updated 8/26/2011 333
ADOBE DIRECTOR BASICS 3D: Controlling action trace(member("Physics").getSpring("test constraint")) -- spring("test constraint") trace(member("Physics").getSpring("linear")) -- trace(member("Physics").getConstraint("linear")) -- constraint("linear") For similar reasons, the physicsMember.getConstraints() function will only include joints in the output list. trace(member("Physics").getConstraints()) -- [constraint("linear"), constraint("angular")] To obtain references to all the springs created within a Physics member, you need to use the physicsMember.getSprings() function. trace(member("Physics").getSprings()) -- [spring("spring")] Deleting a joint or spring To delete a joint or a spring, you can use the physicsMember.deleteConstraint() method. You can provide either the name of the object to delete, or a reference to it. trace(member("Physics").getSprings()) -- [spring("spring")] trace( member("Physics").deleteConstraint("spring")) -- 1 trace(member("Physics").getSprings()) -- [] vAngularJoint = member("Physics").getConstraint("angular") trace(vAngularJoint) -- constraint("angular") trace( member("Physics").deleteConstraint(vAngularJoint)) -- 1 trace(vAngularJoint) -- Note: If you conserved a reference to the ConstraintDesc that you used to create a joint or a spring, the ConstraintDesc will now be available for use with another joint or spring. For only springs, you can use the physicsMember.deleteSpring() method. If you attempt to use this method with an object that is not a spring, a script error occurs. It will fail silently if you use it with a string that is not the name of a spring. Angular joint properties An angular joint between two objects allows those objects to rotate freely to any angle with respect to each other. However, the distance that separates the two objects is constrained. For information on how to create, access, and delete an angular joint, see “Joints and springs” on page 330. To experiment with the way an angular joint will link two rigid objects together, download the movie AngularJoint.dir. Last updated 8/26/2011 334
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ADOBE ® DIRECTOR ® BASICS
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Contents Preface Credits . . . . .
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Chapter 3: 3D: Controlling action F
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