[Maxscript] How to get Selection count

BeatKitano · Apr 2010

i'm slowly converting to max, but want some customization in the toolset, and i encountered a wall.

I'm really just discovering maxscript and i can't find a way to get the sub object selection count in editable poly.
It's really frustrating because the values are given in the modifier tab

Can you help me ?

Thanx.

Rick Stirling · Apr 2010

I don't have max at home, but I've done something similar before by looping though all the faces in the object and using getElementsUsingFace to get an array of all the faces in each element.

SyncViewS · Apr 2010

Hi, here is a sample of the command you need. Here is a small index of handy bookmarks in the MaxScript reference:

Nodes:
- Node Common Properties, Operators, and Methods

Editable Poly Stuff:
- Interface: EditablePoly
- Editable_Poly Methods

Array and BitArray
- Array Values
- BitArray Values

(
    -- create a plane and convert it to Editable Poly
    local theNode = convertToPoly(Plane())
    
    -- get the Base Object of the plane node
    -- the first element at the bottom of the modifier stack
    -- in this case is not needed because there is only one item, but is a good practice
    -- in this case theBase is a pointer to the Editable Poly 
    local theBase = theNode.baseObject
    
    -- set the selection at vert level to verts from 1 to 5 and from 10 to 17
    polyOp.setVertSelection theBase #{1..5, 10..17}
    
    -- get current vert selection
    -- baVertSelection is a type BitArray
    local baVertSelection = polyOp.getVertSelection theBase
    
    -- get the count of elements in baVertSelection BitArray
    local iVertSelectionCount = baVertSelection.numberSet
    
    -- print vert selection in the listener
    format "Current vert selection is: %, made by % elementsn" baVertSelection iVertSelectionCount
    
    -- Same goes for Edges and Faces 

    -- Edges
    polyOp.setEdgeSelection theBase #{6..9, 15..17, 20}
    local baEdgeSelection = polyOp.getEdgeSelection theBase
    local iEdgeSelectionCount = baEdgeSelection.numberSet
 
    format "Current edge selection is: %, made by % elementsn" baEdgeSelection iEdgeSelectionCount

    -- Faces (Polys)
    polyOp.setFaceSelection theBase #{1..2, 7, 9..14}
    local baFaceSelection = polyOp.getFaceSelection theBase 
    local iFaceSelectionCount = baFaceSelection.numberSet

    format "Current face selection is: %, made by % elementsn" baFaceSelection iFaceSelectionCount
)

Edit Note: elementsn should be elementsBACKSLASHn to jump to a new line. The html eats it away.

Press F11 to open the MaxScript listener. After the execution of this code you can select the plane and by cycling through sub-object levels, verify the actual selections.

MoP · Apr 2010

Yeah, using the "numberSet" property of the bitarray is what I always do, it's pretty easy.

BeatKitano · Apr 2010

Thank you so much SynchViewS, i searched all night yesterday, i can move on now

renderhjs · Apr 2010

he he more people are converting to maxScript which is certainly good for the tech talk section here at polycount.

e-freak · Nov 2011

Sorry for resurecting this old thread, but I'm stuck with a similar problem:

I need Max to return the number of Elements/SubObjects (4 in this test case). I tried getOpenEdges and converting these to FaceSelections and reading those but I'm stuck now comparing these to get the number of Elements.

Am I on the right track and how could this comparison work or is there an easier way to do this? (why is there no getNumElements

)

Edit: I think I got it, have to test it though:
Create a bitArray with all open Edges
Select the first Edge
Set NumberOfElements +1
Convert to Element Selection
Convert to Edge Selection
Subtract those Edges from the bitArray
Select the next Edge and loop.

Edit: It worked

global alledges = #{}
addElement = false
emptyedges = #{}
alledges += polyop.getOpenEdges $.baseobject
alledgesComp = alledges
numberOfElements = 0;
for i in alledges do (
$.EditablePoly.SetSelection #Edge #{i}
$.EditablePoly.ConvertSelection #Edge #Element
$.EditablePoly.ConvertSelection #Element #Edge
alledges -= polyOp.getEdgeSelection $.baseobject
    for i in (alledgesComp - alledges) do
    (
        addElement = true
    )
    if (addElement == true)  do
    (
        numberOfElements += 1
    )
    addElement = false
alledgesComp = alledges
)
format "%\n" numberOfElements

[Maxscript] How to get Selection count

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