Version: 2018.2 (switch to 2018.3b or 2017.4)
NetworkStartPosition
Network Transform Child
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Network Transform

The Network Transform componentA functional part of a GameObject. A GameObject can contain any number of components. Unity has many built-in components, and you can create your own by writing scripts that inherit from MonoBehaviour. More info
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synchronizes the movement and rotation of GameObjectsThe fundamental object in Unity scenes, which can represent characters, props, scenery, cameras, waypoints, and more. A GameObject’s functionality is defined by the Components attached to it. More info
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across the network. Note that the network Transform component only synchronizes spawned networked GameObjects.

The Network Transform component
The Network Transform component
Property Function
Network Send Rate (seconds) Set the number of network updates per second. You can set this slider to 0 for GameObjects that do not need to update after being created, like non-interactive effects generated by a player (for example, a dust cloud left behind that the player cannot interact with).
Transform Sync Mode Select what type of synchronization should occur on this GameObject.
    Sync None Don’t synchronize.
    Sync Transform Use the GameObject’s Transform for synchronization. Use this if the physics system does not control this GameObject (that is, if you are moving it via scripting or animation). This is the default option.
    Sync RigidbodyA component that allows a GameObject to be affected by simulated gravity and other forces. More info
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2D
Use the Rigidbody2D component for synchronization. Use this if the 2D physics system controls this GameObject.
    Sync Rigidbody 3D Use the Rigidbody component for synchronization. Use this if the 3D physics system controls this GameObject.
    Sync Character ControllerA simple, capsule-shaped collider component with specialized features for behaving as a character in a game. Unlike true collider components, a rigidbody is not needed and the momentum effects are not realistic. More info
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Use the Character Controller component for synchronization. Only select this if you’re using a Character Controller.
Movement:
    Movement Threshold Set the distance that a GameObject can move without sending a movement synchronization update.
    Snap Threshold Set the threshold at which, if a movement update puts a GameObject further from its current position than this, the GameObject snaps to the position instead of moving smoothly.
    Interpolate Movement Factor Use this to enable and control interpolationThe estimation of values that determine the shape of an animation curve between two keys. More info
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of the synchronized movement. The larger this number is, the faster the GameObject interpolates to the target positionA joint property to set the target position that the joint’s drive force should move it to. More info
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. If this is set to 0, the GameObject snaps to the new position.
Rotation:
    Rotation Axis Define which rotation axis or axes should synchronize. This is set to XYZ (full 3D) by default.
    Interpolate Rotation Factor Use this to enable and control interpolation of the synchronized rotation. The larger this number is, the faster the GameObject interpolates to the target rotation. If this is set to 0, the GameObject snaps to the new rotation.
    Compress Rotation If you compress rotation data, the amount of data sent is lower, and the accuracy of the rotation synchronization is lower.
        None Choose this to apply no compressionA method of storing data that reduces the amount of storage space it requires. See Texture Compression3D Graphics hardware requires Textures to be compressed in specialised formats which are optimised for fast Texture sampling. More info
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, Animation CompressionThe method of compressing animation data to significantly reduce file sizes without causing a noticable reduction in motion quality. Animation compression is a trade off between saving on memory and image quality. More info
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, Audio Compression, Build Compression.
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to the rotation synchronization. This is the default option.
        Low Choose this to apply a low amount of compression to the rotation synchronization. This option lessens the amount of information sent for rotation data.
        High Choose this to apply a high amount of compression to the rotation synchronization. This option sends the least amount of information possible for rotation data.
    Sync Angular Velocity Tick this checkbox to synchronize the angular velocity of the attached Rigidbody component.

This component takes authority into account, so local player GameObjects (which have local authority) synchronize their position from the client to server, then out to other clients. Other GameObjects (with server authority) synchronize their position from the server to clients.

A GameObject with a Network Transform componentA Transform component determines the Position, Rotation, and Scale of each object in the scene. Every GameObject has a Transform. More info
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must also have a Network Identity component. When you create a Network Transform component on a GameObject, Unity also creates a Network Identity component on that GameObject if it does not already have one.

Note that the Network Transform Visualizer component is a useful tool for debugging the Network Transform component.

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NetworkStartPosition
Network Transform Child