How to resize part from one face at any angle and by non integers

Help and Feedback Scripting Support
#1

I have a tree rotating complexly. It’s welded to a rotating sphere. I want to adjust the height of the tree. I dont want to enter how much to grow/shrink the tree, I just want to enter the final size of the tree along the y axis, and keep the base of the tree on the surface of the sphere.

part:Resize() requires the increment (1 makes it bigger by 1, not equal to 1), not final size. I found the maths to make it work, subtracting the final size by the current size i think, however the answer is usually a fraction, and the function requires integers.

Since its at weird angles i cant just move the Y cframe up/down, and im not sure how calculate what the x y and z must be at any angle.

Help?

Images:
image
Small tree meshes welded to a mesh sphere in a viewport

image
Game running, viewport audio-vizualiser running, making meshes bigger depending on the loudness of the music, on a rotating planet. Meshes are longer as expected but are growing symmetrically instead of the bottom remaining on the planet’s surface.

#2

Could you include some pictures of what you’re trying to do? I’m a little confused by your description and I think we might be able to help better if you can show us what you want to do w/ a picture.

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#3

I added images now, im making a simple audio vizualiser on my main menu. Need the trees’ Y size to grow while their base remains on the planet’s surface. They are at an angle so I can’t just move them higher in the Y position.

image

With game running:

image

#4

So are the tree meshes are made at an angle, or are the trees rotated in studio?

#5

they are welded to the planet. The planet rotates and they get dragged along too. they were originally vertical.

#6

The CFrame data has three vectors that can help. They are LookVector, UpVector, and RightVector. The UpVector tells you which direction the top of the model is facing - and it’s a unit vector of length one. So if you want to grow the tree by 0.5 studs, you just take the old CFrame and add 0.5 times the UpVector.

Tree.CFrame = Tree.CFrame + Tree.CFrame.UpVector*0.5

Hope that helps

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#7

Thank you! I didn’t know about upvector, i was thinking of somehow finding it using maths and lookvector.

I used Position instead of CFrame however as CFrame takes into acount welds and brought the whole planet with it.

Final code:

local RS = game:GetService("ReplicatedStorage")

local RunS = game:GetService("RunService")

local Audio = RS.startrekything

local tree = script.Parent

local loudness

RunS.RenderStepped:Connect(function()

loudness = Audio.PlaybackLoudness

tree.Position = tree.Position + tree.CFrame.UpVector*((loudness/100+5)-script.Parent.Size.Y)*.5

script.Parent.Size = Vector3.new(2, (loudness / 100)+5, 2)

end)
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