Place a part on face of another part ?
How would I go about placing a thin layer of snow on top of an parts top face, I would just make the script clone the part at change the add to the Z value of the CFrame, but the parts are cframed and different sizes.
1 answer
Object Space
CFrames describe a position and orientation in space.
Actually, they describe the position and orientation relative to some reference frame.
If you have some reference CFrame and some part, then you can say
relative = reference:toObjectSpace( part.CFrame )
to get a relative CFrame which describes the offset from reference to part.CFrame.
To 'apply' this relative change, you can use
absolute = reference:toWorldSpace(relative)
-- or = reference * relative -- (same thing)
A Part's Object Space
For a Part, the origin (0, 0, 0) is the Part's CFrame. The Top surface is at CFrame.new(0, part.Size.y/2, 0).
Thus we can get a CFrame with the same orientation as Part, but at its Top surface, using
top = part.CFrame * CFrame.new(0, part.Size.y/2, 0)
If you want to put a part on top of it that's 0.2 studs thick, then that part's center would have to be 0.1 studs further out:
snow.Size = part.Size * Vector3.new(1, 0, 1) snow.CFrame = part.CFrame * CFrame.new(0, part.Size.y/2 + 0.1, 0)