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I would like to shoot a projectile towards a point in space (in a 2D game). I have something almost working but I can't get my head round how to fix it. I would like to solve the following: 1) How to shoot in a certain direction not just where the mouse is (I could only get it working right with this mouse pointer method but in reality I just want to shoot something in a direction (and maybe not use mouse). 2) The projectiles shoot out sort of 90 degrees to where the mouse pointer is but I want them to shoot at where mouse pointer is. I seem to get automatically very confused when thinking about angles. 3) At certain positions (90 degrees?) the projectiles sort of flip to the other side when I really just want it to track smoothly all the way round. Here is the code. Can anyone help? Maybe there is just a better way to do it? function App:Start() --Create a window self.window = Window:Create() self.context = Context:Create(self.window) self.world = World:Create() local camera = Camera:Create() camera:SetRotation(35,0,0) camera:Move(0,0,-6) local light = DirectionalLight:Create() light:SetRotation(35,35,0) --Create a model self.model = Model:Box() return true end function App:Loop() if self.window:Closed() or self.window:KeyHit(Key.Escape) then return false end --Get the vector between the mouse position and the center of the screen local v = self.window:GetMousePosition() local dx = v.x - self.context:GetWidth()/2.0 local dy = self.context:GetHeight()/2.0 - v.y v = Vec3(dx,dy,0):Normalize() --Align the model to the vector self.model:AlignToVector(v,2) -- Create projectile bullet = Model:Sphere() bullet:SetPosition(5,0,0) bullet:SetMass(1.0) -- Align to mouse pointer vector bullet:AlignToVector(v, 2) -- Add velocity bullet:SetVelocity(Vec3(0,10,0), false ) Time:Update() self.world:Update() self.world:Render() self.context:Sync() return true end Thanks, Michael