Coding Roblox Games Made Easy by Zander Brumbaugh

Author:Zander Brumbaugh
Language: eng
Format: epub
Publisher: Packt Publishing Pvt Ltd
Published: 2021-01-08T00:00:00+00:00

Body movers

Instances of the BodyMover base class are a convenient way of consistently applying forces directly or applying forces to accomplish a goal when working with BasePart instances. BodyMover instances will only have an effect if they're parented to BasePart instances. This means that if you wanted an entire model to move, the parts would need to be welded together with the BodyMover instance in a central part:

Figure 4.11 – There are six body mover instances, each with different behaviors

BodyForce is a Body Mover instance that applies a force to the instance it is parented to. This force is applied on a world space basis, meaning that it is not relative to the orientation of the part itself. The primary property of this instance is Force, a Vector3 that is applied to the center of mass of the part. Though applying direct force has many practical examples and in the following code, we will make a part locally experience zero gravity. To do this, we need a basic understanding of physics and the GetMass() method of BasePart instances. The force that must be used to suspend the part in the air is its mass multiplied by gravity, applied upward on the Y axis:

local part = workspace.Part

local bodyForce = Instance.new("BodyForce")

bodyForce.Parent = part

local requiredForce = part:GetMass() * workspace.Gravity

bodyForce.Force = Vector3.new(0,requiredForce,0)

BodyVelocity is another Body Mover instance that similarly operates on the world space. This instance is particularly useful when you want to set an object's velocity to be consistent without the need of a loop. The two main properties of this Body Mover are MaxForce and Velocity. The MaxForce is a Vector3 property and represents the amount of force that is applied to a part when a velocity is set. This means that if a part's mass is greater than the mover's MaxForce multiplied by gravity on a given axis, that part will be unable to move along that axis. The Velocity property is also a Vector3 and simply needs to be set to the desired velocity.

In the following example, we have a part moving forward relative to its front face. Notice that we set each component of the MaxForce property to math.huge, an essentially infinite value; this is so that the mover will be able to influence the part, regardless of the part's mass. As your skills become more advanced, you may want to adjust the value that's used for this property to prevent any unwanted behaviors, but for the examples shown here, this is optimal. By multiplying the desired speed by the forward-facing directional vector of the part, or the LookVector component of its CFrame, we can create a world space velocity that is still moving forward relative to the front face of the part. It is recommended that you run this code in the Command Bar area, or even have it in a server script and test it on Run mode for easier observation:

local Part1 = workspace.Part1

local bodyVelocity = Instance.new("BodyVelocity")

local huge = math.huge

bodyVelocity.MaxForce = Vector3.new(huge,huge,huge)

bodyVelocity.Parent = Part1

local projectileVel = 5

local moverVel = Part1.

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