[Closed] Bitarray and Edit Poly headache

Hmm… seems odd. It works if you don’t convert the GetSelection call to an array and instead just leave it as a bitArray. Also doesn’t work when supplying SetSelection a hardcoded bitArray. Not sure why though! The bitArray from GetSelection appears to be magical.

i tested and found this problem too but i also found the solution…

apparently the bitarray that you supply must be the same size as the number of edges. So in your example the box has 12 edges. when you use GetSelection you will find that the bitarray that is returned has a count of 12 but only bit 8 is set. when cast to an array and then back to a bitarray, the new bitarray is only as long as the highest set bit ie. 8. so you need to set the count of the bitarray to the number of edges before calling SetSelection. see below:

ep = modPanel.getCurrentObject()
  -- Edit_Poly:Edit Poly
  ba = ep.GetSelection #edge
  -- #{8}
  ba.count
  -- 12
  a = ba as array
  -- #(8)
  b = a as bitarray
  -- #{8}
  b.count
  -- 8
  b.count = ep.GetNumEdges()
  -- 12
  ep.SetSelection #edge b
  -- true

Hi Neil, I always have problems with <Edit_Poly>.setSelection. I found the <Edit_Poly>.select is a little more predictable. The only issue is you got to set selection in two steps: first deselect current selection, then set the new one. Follows the code of the function I use to set selection both in Editable Poly objects, and Edit Poly Modifiers.

function setEdgeSelection theNode theEditObj baEdges =
(
    if ((classOf theEditObj) == Editable_Poly) then
    (
        polyOp.setEdgeSelection theEditObj baEdges
    )
    else if ((classOf theEditObj) == Edit_Poly) then
    (
        if (modPanel.getCurrentObject() != theEditObj) do
            modPanel.setCurrentObject theEditObj

        local nLevel = theEditObj.getEPolySelLevel()

        if (nLevel != #Edge) do
            theEditObj.setEPolySelLevel #Edge

        theEditObj.select #Edge (theEditObj.getSelection #Edge) select:false node:theNode
        theEditObj.select #Edge baEdges select:true node:theNode

        if (nLevel != #Edge) do
            theEditObj.setEPolySelLevel nLevel
    )
)

@ Gravey: that is nice. I’ll run some tests too, and eventually update my functions.

• Enrico

Thanks guys. It’s an odd workaround, but it works.

• Neil

Officially logged as a bug. At the very least I hope for a mention of the issue in the help file.

• Neil

If it really is a bug! probably not. Something for sure, is that Autodesk is aware of this.

Macrorecorder uses $.modifiers[#Edit_Poly].SetSelection #Edge #{} to clean the selection

and

$.modifiers[#Edit_Poly].Select #Edge #{5}

to actually select edges

Well as I said, if it’s not a bug, it at least should have a mention of this in the help file, which is what I asked for in my bug report. But thanks for the extra info, good to know.

• Neil

it seems it happens that way because edit_poly is a modifier
and “SetSelection” is meant to baseobjects

then $.modifiers[1].select is additive

I think the idea is that edit_poly is relative to the baseobject itself

but definitely agree that those things should be clarified in the help file

Personally I’d like to just get rid of the bitarray all together, since they always give me trouble everytime I have to use them But since that’s not gonna happen, better documentation with example code is a close second.

• Neil