Unity3d 使用 Node Canvas，unity3dcanvas

Unity3d 使用 Node Canvas，unity3dcanvas
Node Canvas

Node Canvas是一個行為樹的外掛程式，它是圖形化的操作模式，可以簡化開發邏輯，官方文檔在這 .

基本元素

流程上的原則是，一旦傳回值為False則向上返回。一般在BehaviourTreeOwner組件上，要勾選Repeat迴圈監測。通常這些監測指的是各子樹的條件判斷。常用的元素如下：

元素名稱	對應邏輯	備忘
Action	操作	各種操作，用過都說好
Condition	條件判斷	各種判斷，沒它真不成
Selector	選取器	邏輯|| 如果有返回為真的子樹，則停止執行，返回真
Sequencer	順序器	邏輯&&與Selector相反，有返回假的，則返回假
Parallel	並行器	“同時”執行子樹，傳回值根據Policy取捨
Conditional	條件節點	如果不合條件，直接返回False，不執行子節點
Filter	過濾器	限制性訪問，比如初始化時只進一次
Iterate	迭代器	做迴圈用
OverrideAgent	複寫變數	對於子節點，不使用行為樹掛載的Agent

快速鍵

Here are the node/canvas controls and shortcuts:

• Right Click on the canvas to add a new node.
• Click & Drag to pan the node.
• Middle Click & Drag in the canvas to pan the canvas.
• Shift + Click & Drag a node to pan it and all of it’s children together; panning a branch.
• Click & Drag from a port over a target node to connect. Right click a connected port to disconnect.
• Click & Drag from a port into empty canvas space, will show context menu to automaticaly create and connect a new node.
• Click a connected port or connection itself to select the connection.
• Delete the selected node or connection with Delete Key, or through the right click context menu.
• Duplicate a node with Control+D or through the right click context menu.
• Double Clicking a node will open it’s script in the IDE, unless it’s a Nested Node in which case it will open the nested tree.
• Relink a connection by click and dragging it over a new node.
• Hit “F” will focus the canvas on the center of all your nodes within it.
• Mouse Scroll Wheel will Zoom In/Out the canvas.
• Left Click and Drag in the canvas, will allow you to create a selection rectangle.
• Holding Control while making a rectangle selection will create a Canvas Group.

On right click on a node or connection, a context menu will show up. Depending on the node or connection type there might be different extra options. Following are the common operations:

• Delete: Deletes the Node or Connection. (available in multiselection as well).
• Copy Node: Copies the Node possible to Paste later. (available in multiselection as well)
• Copy Assigned Task: Will copy the task that has been assigned to the Node or Connection.
• Paste Assigned Task: Will paste the currently copied Task to the Node or Connection and assign it.

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