MAXScript學習筆記(3) 具體功能開發

一.分離一個特定元素(Detach Element)

要對一組相同的物體(Editable_Poly)進行分離物體下某一個部分的功能。

本來以爲Editable_Poly裏面會有相關的Element的API，結果全是點(Vert)線(Edge)面(Face)，只有一個getElementsUsingFace

而它的參數是 faceList，問題是在polyop裏我還找不到getFace的函數....

也就是說這個界面上的基本操作實際上是封裝了一層的，api層至多到Face層級，沒有更高的層級了。

搜索了一番，找到了兩個有用的函數

fn getElements obj=
	(
		try
		(
			f=obj.numfaces
			eles=#()
			done=#()
			for i=1 to f do
			(
				if (finditem done i)==0 then
				(
					case (classof obj) of
					(
						editable_mesh:(faces=(meshop.getElementsUsingFace obj #(i)) as array)
						editable_poly:(faces=(polyop.getElementsUsingFace obj #(i)) as array)
					)
					append eles faces
					join done faces
				)
			)
		)
		catch(
			eles=undefined
		)
		return eles
	)

參考：https://www.maxforums.org/forum/thread/maxscript_mesh_elements/1

	function detachElements nin_Object = 
	( 
		naOut = #()
		if classof nin_Object == Editable_Poly do
		( 
			suspendediting()
			try
			(
				undo off
				(
					with redraw off
					(
						while polyOp.getNumFaces nin_Object != 0 do 
						(
							elementSel  = (polyOp.getElementsUsingFace nin_Object #{1})
							baseName  = nin_Object.name
							newName   = (uniqueName baseName)
						
							polyOp.detachFaces nin_Object elementSel asNode:true name:newName
							detachedObj = (getNodeByName newName)
							append naOut detachedObj
						)
					
						for o in naOut do
						(
							baseName  = (substring o.name 1 (o.name.count-3))
							uniquePart  = (substring o.name (o.name.count-2) o.name.count)
							finalName   = (baseName + "_" + uniquePart)
							o.name    = finalName
							centerPivot o
						)
					)
				)
			)
			catch(messageBox "error: detach objects")
			resumeediting()
			
			delete nin_Object
		)
		naOut as array
	)

參考：http://www.scriptspot.com/forums/3ds-max/general-scripting/edit-poly-modifier-quick-detach

接下來又是二次開發的工作了，我要把Element相關的操作封裝到一個ElementOp裏面