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
1 | 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
1 | absolute = reference:toWorldSpace(relative) |
2 | -- 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
1 | 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:
1 | snow.Size = part.Size * Vector3.new(1, 0, 1) |
2 | snow.CFrame = part.CFrame * CFrame.new(0, part.Size.y/2 + 0.1, 0) |