finding all elements of a polyObject

#1

I searched for the solution, but all I found is that we have to use the polyop.getElementsUsingFace() function.
but how??

I tried to store all the elements into an array:

currentElement = #()
   elementsArr = #(currentElement)
   for i = 1 to $.getNumFaces() do(
   	currentElement = (polyop.getElementsUsingFace $ i as array)
   --    print currentElement
   	for o = 1 to elementsArr.count do(
   		if (findItem elementsArr[o] currentElement) == 0 then(
   			append elementsArr currentElement
   		)
   		else(
   			exit
   		)	
   	)		
   )

this runns an endless loop…

strange things for me I remarked are, that if you enable the “print currentElement”, it doesn’t print an array. only a number. doing this afterwards it prints an array.
I also tried to add a loop that runs trough each item in the currentElement, so finditem searches for a variable, not an array, but somehow this ended up again in an endless loop, but didn’t do what I want.

I hope somebody can help with that.

tnx

#2

lol…sometimes it just happens that 5 min after posting a question, a light goes up and you see the solution.

well this happened right now :smiley:

currentElement = #()
 elementsArr = #(currentElement)
 doAdd = false
 for i = 1 to $.getNumFaces() do(
 	currentElement = ((polyop.getElementsUsingFace $ i) as array)
 	for o = 1 to elementsArr.count do(
 		if (findItem elementsArr[o] currentElement[1]) == 0 then(
 			doAdd = true
 		)
 		else(
 			doAdd = false
 			exit
 		)
 	)
 	if doAdd == true do(
 		append elementsArr currentElement
 	)		
 )
 deleteItem elementsArr 1
 elementsArr

the problem was that it appended the currentElement in the loop, so multiple times, and trough that it somehow extended the loop for each face again…causing a slowdown and very long loop :stuck_out_tongue:

#3

Here’s another approach using a bitArray, which is perfect for stuff like this:

(
	-- Array to store elements
	local Elements = #()
	
	-- Array containing all face indices
	local Faces = #{1..$.numFaces} as array
	
	-- Loop until nothing left in 'Faces' array
	while Faces.count > 0 do
	(
		-- Get the element using the first face in the 'Faces' array
		local FaceElem = polyOp.getElementsUsingFace $ Faces[1]
		
		-- Subtract the element from the 'Faces' array
		Faces = ((Faces as bitArray) - FaceElem) as array
		
		-- Append the elements
		append Elements FaceElem
	)
	
	-- 'Elements' now contains an array of bitarrays
	Elements
)

Cheers,
Martijn

#4

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