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CFraming local to the part?

Asked by
lightpower26 399 Moderation Voter
9 years ago

So I'm making a plugin for gun developers like me to CFrame their character's arms and then printing out the CFrame they've produced. Pretty easy, right? Not when you think of some necessary features like local and global movement. The increments will be easy for me, not so much the local movement. I know how to make it move locally forward and backward. You do this:

view source
1Part.CFrame = Part.CFrame * (Part.CFrame.lookvector * 3) --This would make it go forward locally 3 studs
2 
3Part.CFrame = Part.CFrame * (Part.CFrame.lookvector / 3) --This would make it go backward locally 3 studs

(If I'm wrong about that, then please, please correct me)

But how would I go moving the part up, down, left, or right locally? I simply can't think of anything...!

1 answer

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0
Answered by
Destrings 406 Moderation Voter
9 years ago

A CFrame is made out of 12 components: It's position in the Euclidean space and the rotation matrix which has 9 components.

[C00, C01, C02]

[C10, C11, C12]

[C20, C21, C22]

The rotation matrix can be viewed as normal vectors for the axes. (C00, C10, C20) is the normal on X, (C01, C11, C21) the normal on Y and (C02, C12, C22) the normal on Z

CFrame.lookVector is actually -(C02, C12, C22) thats why it moves on the Z axis (forward or backward) when you composite them

One way of moving the part in other directions it's to take the other 'lookVectors' for the desired axis.

So to move a part locally up

view source
01function lookVectorX(cf)
02    local _, _, _, x, _, _, y, _, _, z  = cf:components()
03    return Vector3.new(x, y, z)
04end
05 
06function lookVectorY(cf)
07    local _, _, _, _, x, _, _, y, _, _, z = cf:components()
08    return Vector3.new(x, y, z)
09end
10 
11function lookVectorZ(cf)
12    local _, _, _, _, _, x, _, _, y, _, _, z = cf:components()
13    return Vector3.new(x, y, z)
14end
15 
16p = script.Parent
17wait(4)
18p.CFrame = p.CFrame + (lookVectorY(p.CFrame) * 3)

And likewise with the other axis.

0
Thanks a lot! I'm still confused as of how to rotate globally, but I'll make a separate question for that lightpower26 399 — 9y
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