Adobe Director Basics

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ADOBE DIRECTOR BASICS 3D: Controlling action Note: This article deals only with angular joints, linear joints, and springs. For details of D6Joints, see “D6Joints” on page 338. Although they share many characteristics, springs are treated as one kind of object (spring) and angular and linear joints are treated as a different kind of object (constraint). The terms “joint” and “constraint” both refer to the angular and linear joint objects. To compare the behavior of Linear constraints and Angular constraints, download and launch the movie Joints<strong>Basics</strong>.dir. The Joints<strong>Basics</strong>.dir movie allows you to compare the behavior of Linear and Angular Joints ConstraintDesc Before you can create any of these three types of controls, you will need to create a ConstraintDesc object using the ConstraintDesc() function. You then use the ConstraintDesc object to create the Linear Joint, Angular Joint, or Spring. The ConstraintDesc() function requires seven items of data: name: a unique string, not used by any other constraint objectA: a rigidBody object, to connect to one end of the constraint objectB: a rigidBody or VOID or null to connect to the other end of the constraint. If VOID or null are used then the objectA rigidBody will be connected to a fixed point in world space. pointA: a vector position in the frame of reference of the objectA rigidBody to which the constraint is to be attached. pointB: a vector position in the frame of reference of the objectB rigidBody, or in world space, to which the constraint is to be attached. stiffness: a non-negative floating point number to define the stiffness of the constraint. damping: a non-negative floating point number to define the damping of the constraint. Last updated 8/26/2011 331
ADOBE DIRECTOR BASICS 3D: Controlling action Example vRigidBody = member("Physics").getRigidBodies()[1] vWorldPoint = vector(0, 0, 0) vStiffness = 1234.5 vDamping = 321.0 vConstraintDescriptor = ConstraintDesc("Test Constraint", vRigidBody, null, vRigidBody.position, vWorldPoint, vStiffness, vDamping) trace(vConstraintDescriptor) -- (Constraint Descriptor) Creating the constraint You can use the following functions to create the three different types of constraints: Note: Each function requires different parameters in addition to a ConstraintDesc object. physicsMember.createAngularJoint() requires a floating point rest length for the constraint physicsMember.createLinearJoint() requires an axisAngle list, containing an axis vector and a scalar angle physicsMember.createSpring() requires both a symbol force exertion mode and a floating point rest length for the constraint. The force exertion mode symbol can take one of three values: #kDuringCompression, #kDuringExpansion, or #kBoth. Examples In the examples below, it is assumed that a ConstraintDesc, using a unique name, has already been created, as described in the previous section. Although a ConstraintDesc is an independent object, a script error occurs if you try to use the same ConstraintDesc for two different controls. This is because the name for the control is stored in the ConstraintDesc, and each control must have a unique name. The first example shows the creation of an angular joint with a rest length of 23.59 world units. vRestLength = 23.59 vAngularJoint = member("Physics").createAngularJoint(vAngularDescriptor, vRestLength) trace(vAngularJoint) -- constraint("angular") trace(vAngularJoint.constraintType) -- #angular trace(vAngularJoint.properties) -- [#length: 23.5900] The next example shows the creation of a linear joint with a random orientation. vAxis = randomVector() vAngle = random(360) vOrientation = [vAxis, vAngle] vLinearJoint = member("Physics").createLinearJoint(vLinearDescriptor, vOrientation) trace(vLinearJoint) -- constraint("linear") trace(vLinearJoint.constraintType) -- #linear trace(vLinearJoint.properties) -- [#axis: vector( 0.9598, 0.0499, -0.2761 ), #angle: 56.0000] The last example shows the creation of a spring which will resist both expansion and contraction, and which has a rest length of 17.23. Last updated 8/26/2011 332
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