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How can I make this projectile fire in the right direction?

Asked by

Citranix 19

7 years ago

I am very new to scripting so I'm sorry if this scripts untidiness makes you cringe.

01local tool = script.Parent
02local player = tool.Parent.Parent
03local mouse = player:GetMouse()
04local root = player.Character.HumanoidRootPart
05 
06 
07tool.RemoteEvent.OnServerEvent:connect(function(player,mousehit)
08    if player.Character:FindFirstChild("multiattackprevention") then return end
09    local multiattackprevention = Instance.new("StringValue")
10    multiattackprevention.Parent = player.Character
11    multiattackprevention.Name = ("multiattackprevention")
12    local hitcooldown = false
13    local animation = player.Character.Humanoid:LoadAnimation(player.Character:FindFirstChild("SuperJump"))
14    animation:Play()
15    wait(0.5)
16    local bv = Instance.new("BodyVelocity")
17    bv.Parent = player.Character.Torso
18    bv.Velocity = Vector3.new(0,200,0)
19    wait(0.7)
20    bv:Destroy()
21    root.CFrame = mouse.Origin
22    player.Character.Head.Anchored = true
23    local animation = player.Character.Humanoid:LoadAnimation(tool.Cast)
24    animation:Play()
25    wait(0.4)
26    local projectile = Instance.new("Part")
27    projectile.Transparency = 1
28    projectile.Parent = game.Workspace
29    projectile.Position = player.Character:FindFirstChild("Right Arm").Position
30    projectile.CanCollide = false
31    projectile.TopSurface = ("Smooth")
32    projectile.BottomSurface = ("Smooth")
33    projectile.Size = Vector3.new(10,10,10)
34    local fireparticle = Instance.new("Fire")
35    fireparticle.Parent = projectile
36    fireparticle.Size = 20
37    fireparticle.Heat = 25
38    local bv = Instance.new("BodyVelocity")
39    bv.Parent = projectile  
40    bv.MaxForce = Vector3.new(1e8,1e8,1e8)  
41    bv.Velocity =  root.CFrame.p * 150
42    local sound = Instance.new("Sound")
43    wait(0.2)
44    multiattackprevention:Destroy()
45    projectile.CanCollide = true
46    player.Character.Head.Anchored = false
47    projectile.Touched:connect(function(hit)
48        projectile.Anchored = true
49        fireparticle.Size = 30
50        bv.Velocity = mousehit.lookVector * 0
51        if hitcooldown == true then return end
52        local enemy = hit.Parent:FindFirstChild("Humanoid")
53        if enemy == player.Character.Humanoid then return end
54        if enemy then
55            enemy.Health = enemy.Health - 250
56            hitcooldown = true
57            wait(1)
58            projectile:Destroy()
59        else wait(1)
60            projectile:Destroy()
61            wait(3)
62        end
63    end)    
64    wait(10)
65    projectile:Destroy()
66    multiattackprevention:Destroy()
67end)    
 View all 67 lines...

This works with no output error, however the projectile doesn't spawn.

The error is to do with:

`1`	`bv.Velocity` `=` `root.CFrame.p *` `150`

I know this because when I put:

`1`	`bv.Velocity` `=` `mousehit.lookVector *` `150`

the projectile fires, just in the wrong direction.

What should I make bv.Velocity equal to?

use raycasting!1!! stop using terrible roblox physics!!1 hiimgoodpack 2009 — 7y

bv.Velocity = (root.Position - mousehit.p).unit * 150. Normalise the two vectors then multiply by an arbitrary speed (in this case 150) LifeInDevelopment 364 — 7y

3 answers

Answered by

whenallthepigsfly 541

7 years ago

If you want your projectile to fire in the direction the player's torso is facing, which is what it seems like, you were very close. When you had:

`1`	`bv.Velocity` `=` `root.CFrame.p *` `150`

The projectile DID spawn, it was just moving so quickly you couldn't catch a glimpse of it, because you used position, which is usually a large value, so your projectile went shooting off at the speed of sound. What you want is lookVector, which is the unit vector of the direction a CFrame is facing.

`1`	`bv.Velocity` `=` `root.CFrame.lookVector *` `150`

Enjoy :)

Also, a tip: When using Instance.new(), you can assign a parent instantly, without using another line. Just put a comma, and then what you want to parent the new object to.

1local bv = Instance.new("BodyVelocity", player.Character.Torso)
2 
3--Instead of 
4 
5local bv = Instance.new("BodyVelocity")
6bv.Parent = player.Character.Torso

Thank you very much! Citranix 19 — 7y

Answered by

BerrySus 65

7 years ago

Here's an idea

Make the projectile face to where the mouse is

`1`	`projectile.CFrame` `=` `CFrame.new(projectile.CFrame,(mouse.hit.p.x,mouse.hit.p.y,mouse.hit.p.z))`

Make the BodyVelocity go to where the projectile is facing

Answered by

SCP774 191

6 years ago

Edited 6 years ago

If you want the BodyVelocity's velocity to "face" your mouse.

`1`	`Projectile.MaxForce` `=` `Vector3.new(1e8,1e8,1e8)`

`2`	`Projectile.Velocity` `=` `(mouse.hit.p - root.Position).unit * bulletSpeed`

To make the projectile face your mouse. (Makes the projectile look nicer)

`1`	`Projectile.CFrame` `=` `CFrame.new(Projectile.Position, mouse.hit.p)`

You can get the mouse using the player got from the RemoteEvent.

Here's my gun's script. Don't blame me for untidy lines, I just wanted to make it quick.

001--Defines
002local tool = script.Parent
003local fire = tool.Fire
004local remote = tool:WaitForChild("RemoteEvent")
005 
006--Settings
007local damage = 40 -- Headshot damage is * 2.5
008local bulletSpeed = 500 -- Don't go for too much please
009 
010--Startup
011if tool.Parent:IsA("Model") then
012    if game.Players:GetPlayerFromCharacter(tool.Parent) then
013        for i,v in pairs(tool:GetChildren()) do
014            if v:IsA("Part") or v:IsA("BasePart") then
015                v.CanCollide = false
016            end
017        end
018    else
019        for i,v in pairs(tool:GetChildren()) do
020            if v:IsA("Part") or v:IsA("BasePart") then
021                v.CanCollide = true
022            end
023        end
024    end
025else
026    for i,v in pairs(tool:GetChildren()) do
027        if v:IsA("Part") or v:IsA("BasePart") then
028            v.CanCollide = true
029        end
030    end
031end
032--CanCollide stuff
033tool.AncestryChanged:Connect(function()
034    if tool.Parent:IsA("Model") then
035        if game.Players:GetPlayerFromCharacter(tool.Parent) then
036            for i,v in pairs(tool:GetChildren()) do
037                if v:IsA("Part") or v:IsA("BasePart") then
038                    v.CanCollide = false
039                end
040            end
041        else
042            for i,v in pairs(tool:GetChildren()) do
043                if v:IsA("Part") or v:IsA("BasePart") then
044                    v.CanCollide = true
045                end
046            end
047        end
048    else
049        for i,v in pairs(tool:GetChildren()) do
050            if v:IsA("Part") or v:IsA("BasePart") then
051                v.CanCollide = true
052            end
053        end
054    end
055end)
056 
057--Functions
058local function getChildrenWithClassProvided(index, class)
059    for i,v in pairs(index:GetChildren()) do
060        if v:IsA(class) then
061            return v
062        end
063    end
064end
065 
066local function onRemoteFired(plr, cmd, value1, value2)
067    if cmd == "fire" then
068        -- value1 is end point, value2 is the spread
069        -- Yay realistic bullet xd
070        local root = plr.Character.HumanoidRootPart
071        local startPos = fire.Position
072        local bullet = Instance.new("Part")
073        bullet.Parent = game.Workspace
074        --Properties
075        bullet.Anchored = true
076        bullet.CanCollide = false
077        bullet.BrickColor = BrickColor.new("New Yeller")
078        bullet.Material = Enum.Material.Neon
079        bullet.Size = Vector3.new(0.25, 0.25, 2.5)
080        bullet.CFrame = CFrame.new(startPos, value1)
081        bullet.Transparency = 1
082        bullet.Name = "Bullet"
083        --Realistic effects
084        fire.smoke.Enabled = true
085        fire.flash.Enabled = true
086        fire.light.Enabled = true
087        wait(0.1)
088        fire.smoke.Enabled = false
089        fire.flash.Enabled = false
090        fire.light.Enabled = false
091        bullet.Transparency = 0
092        bullet.Anchored = false
093        local bulletLight = Instance.new("PointLight")
094        bulletLight.Brightness = 10
095        bulletLight.Range = 6
096        bulletLight.Color = Color3.new(255, 255, 127)
097        bulletLight.Enabled = true
098        bulletLight.Shadows = true
099        bulletLight.Parent = bullet
100        bulletLight.Name = "Light"
101        --Movement
102        --A lot of physic and math stuff that will get your brain explode
103        local mouse = plr:GetMouse()
104        local direction = (value1 - fire.Position).unit
105        local spawnPos = fire.Position + direction * 2
106        bullet.Velocity = direction * 100 -- yay more math
107        bullet.CFrame = CFrame.new(bullet.Position, mouse.hit.p)
108        local bodyForce = Instance.new("BodyVelocity")
109        bodyForce.Parent = bullet
110        bodyForce.MaxForce = Vector3.new(1e8,1e8,1e8)
111        bodyForce.Velocity = (mouse.hit.p - root.Position).unit * bulletSpeed
112        bullet.Touched:Connect(function(part)
113            if part.Parent:IsA("Model") then
114                local enemyhum = getChildrenWithClassProvided(part.Parent, "Humanoid")
115                if enemyhum then
116                    if enemyhum ~= tool.Parent.Humanoid then
117                        local dmgpt = damage
118                        if part.Name == "Head" or part.Parent:IsA("Accessory") then -- That hurt .-.
119                            dmgpt = dmgpt * 2.5 -- Instant kill
120                        end
121                        enemyhum:TakeDamage(dmgpt)
122                        bullet:Destroy()
123                    end
124                end
125            end
126        end)
127       game:GetService("Debris"):AddItem(bullet, 2.5) -- Remove bullet if it's here too long
128    end
129end
130 
131remote.OnServerEvent:Connect(onRemoteFired)
 View all 131 lines...

It's unfinished so don't try.

How can I make this projectile fire in the right direction?

3 answers

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