Joints: Difference between revisions
>NXTBoy Things I don't remember and can't check are in HTML comments. This might need merging into another page. |
>Samacado changed stuff to code examples, added and changed links - note that you can do (link name|link) text in double brackets |
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A '''joint''', called a "connection" while a game is loading, is something that connects two parts together. Common types of joints are [[Weld]]s, [[Snap]]s, and [[Hinge]] | A '''joint''', called a "connection" while a game is loading, is something that connects two parts together. Common types of joints are [[Weld]]s, [[Snap]]s, and [[Hinge|Hinges]]. Joints are represented using a [[JointInstance]] object, which has four important properties: [[C0]], [[C1]], [[Part0]], and [[Part1]]. | ||
== Automatic creation == | == Automatic creation == | ||
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=== Fixed Joints === | === Fixed Joints === | ||
Joints have a conceptual origin coordinate frame, to which both parts are attached. | Joints have a conceptual origin coordinate frame, to which both parts are attached. | ||
<code lua> | |||
jointOrigin == joint.Part0.CFrame * joint.C0 == joint.Part1.CFrame * joint.C1 | |||
</code> | |||
In the case of fixed joints, this origin position is not important. <!--Or do explosions only act on joint origins? --> | In the case of fixed joints, this origin position is not important. <!--Or do explosions only act on joint origins? --> | ||
It is sufficient to make the origin position the center of Part1, and C1 the identity CFrame. For example: | It is sufficient to make the origin position the center of Part1, and C1 the identity CFrame. For example: | ||
<code lua> | |||
local cf = ... --The transformation from A to B | |||
local weld = Instance.new("Weld") | |||
weld.Part0 = workspace.A | |||
weld.Part1 = workspace.B | |||
weld.C0 = cf | |||
weld.C1 = CFrame.new(0,0,0) | |||
</code> | |||
Will ensure that workspace.A * cf == workspace.B | Will ensure that <code lua>workspace.A * cf == workspace.B</code> | ||
=== Rotating Joints === | === Rotating Joints === | ||
Revision as of 17:54, 15 January 2012
A joint, called a "connection" while a game is loading, is something that connects two parts together. Common types of joints are Welds, Snaps, and Hinges. Joints are represented using a JointInstance object, which has four important properties: C0, C1, Part0, and Part1.
Automatic creation
Advanced
Fixed Joints
Joints have a conceptual origin coordinate frame, to which both parts are attached.
jointOrigin == joint.Part0.CFrame * joint.C0 == joint.Part1.CFrame * joint.C1
In the case of fixed joints, this origin position is not important.
It is sufficient to make the origin position the center of Part1, and C1 the identity CFrame. For example:
local cf = ... --The transformation from A to B
local weld = Instance.new("Weld")
weld.Part0 = workspace.A
weld.Part1 = workspace.B
weld.C0 = cf
weld.C1 = CFrame.new(0,0,0)
Will ensure that workspace.A * cf == workspace.B
Rotating Joints
In a rotating joint, the conceptual origin is important. This dictates the position, and in some cases, the axis around which the joint rotates.
