The problem with the physics of rotating parts

Help and Feedback Scripting Support
#1

Hey humanity!

I learning Roblox Studio a few days, and I am creating another Obby (I have not found a better way to study the features of the Studio and Lua) and it is not clear to me where the physics goes on the rotating parts.

When I make a part in the form of a connection and a loop with a motor, the player can move along with the rotation of the part.

But when I create a simple Rotator script instead, the part rotates under the player’s feet and doesn’t move it.

Rotator Script 
local part = script.Parent

local function randomBetween(min, max)
	local RND = Random.new()
	return RND:NextInteger(min, max)
end

-- начальный случайный поворот
local initialAngle = math.rad(randomBetween(0,360))
part.CFrame *= CFrame.Angles(0, initialAngle, 0)

while wait(0.01) do
	part.CFrame *= CFrame.Angles(0, 0.01, 0)
end

I suspect this is due to the Anchored property. But I don’t know what to change in the script - so that the detail doesn’t slip under the character’s feet.

Thanks and sorry for my english.

1 Like
#2

I believe this is because you’re rotating the part with CFrame. In order to make the player move along with, I believe you have to turn it using roblox physics like a motor or something.

2 Likes
#3

Are you saying that you can’t make a more natural character behavior on rotating parts through a script?

#4

You can but not with CFrame, CFrame sets the position and doesn’t use roblox physics to actually turn it.

#5

Can you tell me what property I need to change for this?

#6

You could use a body mover, this uses roblox physics and is reliable. BodyGyro is what i’d advise you look into or BodyAngularVelocity.

#7

The same thing could be achieved with CylinderConstraint and Attachment, if you used them correctly you can set up an actual physic rotating part

Attachment
CylinderConstraint

#8

The whole point of using a script instead of a motor is simplicity. I just make a part, copy the rotator script into it, and see the result. It’s faster than making a motor. Therefore, I was hoping that you can simply enable some kind of property that will make the player move along with the part.

By iterating over the properties of the part, I found RotVelocity property.

Rotator Script (New Version) 
local part = script.Parent

local function randomBetween(min, max)
	local RND = Random.new()
	return RND:NextInteger(min, max)
end

local initialAngle = math.rad(randomBetween(0,360))
part.CFrame *= CFrame.Angles(0, initialAngle, 0)
part.RotVelocity = Vector3.new(0, 0.3, 0)

while wait(0.01) do
	part.CFrame *= CFrame.Angles(0, 0.01, 0)
end

This makes the character move by part as I wanted. But perhaps there is a more elegant way than getting the angular velocity (0.3 in my case) to the right value.

1 Like
#9

your method may work, but when you play in an actual online mode, you will notice that the part doesn’t rotate smoothly, also it may adding an extra work for scripts if you have multiple of these.
Instead for going easy, I’d rather find some optimization that was already made specifically for it

#10

Umm.
Make an Anchored Part, add another spinning arm Part that’s Unanchored. Connect the two with the Constraints tool ‘Motor’ and make sure the Attachments in each Part are at the same location. Select both Parts and Group them into a Model. Set the Motor Properties to spin the arm at the speed you want.
When you need another spinning arm select the Model and Ctrl-D copy it then move it where you want it and change the Motor Properties as you’d like. Easy peasy lemon squeezy!

#11

I think you have two options.

1] teleport the player
https://devforum.roblox.com/t/jailbreak-train-platform-system/236339
https://devforum.roblox.com/t/how-were-the-trains-in-jailbreak-done-solved/273269
2] unanchored part on hinge