RPCs

Use RPCs to communicate between server and clients. In this example when a button is pressed on the client the function serverCreateObject is called on the server with a position in front of the camera.

local self = {}

function self:Start()
    self.component.syncToClients = true
    self.cam = Scene:GetActiveCamera()

    events.mouseButtonDown.addListener(self, function(button, from)
        --run the following code only on clients
        if self.onServer then return end
        if button == 1 then
            --if left mouse button pressed create a ray from camera position pointing straight forward
            local tf = self.cam.object.transform
            local pos = tf.pos + tf.forward * 3

            --call serverCreateObject with camera position and ray on server
            self:RPC("serverCreateObject", pos, tf.forward * 100)
        end
    end)
end

function self:Update(deltaTime)

end

--this function is called by the RPC
function self:serverCreateObject(origin, ray)
    assert(self.onServer)
    
    --do a raycast and also draw a line to visualize the ray
    local hit = Collision():Raycast(origin, ray)[1]
    deb:line(origin, origin + ray)
    
    local pos = origin + ray
    if hit then 
        pos = hit.pos
        deb:cross(pos) --draw a cross at the hit position
    end
    self:createVoxelObject(pos, Vec3.up)
end

--place a voxel object at pos
function self:createVoxelObject(pos, up)
    assert(self.onServer)
    --if there is no object yet create it
    if not self.ob then
        local ob = Scene:CreateObject("Spawned Object")
        local vd = ob:AddComponent('VoxelData')
        ob:AddComponent('VoxelRenderer')
        vd.path = "Emoji_Blank_Face.am"
        self.ob = ob
    end

    --place the object
    self.ob.transform.pos = pos
    self.ob.transform.rot = Quat.LookAt(Vec3.forward, up)
end

return self