Now I get it, Marcus. Good idea!
So I did test with floats and got some results. The exact same code with
kFloat also fails, but I found something that works with kFloats (but not
with Points).
Shortened version that works with kFloat:
outPointsH = dataBlock.outputArrayValue(self.outPoints)
outPointB = outPointsH.builder()
outPointB.growArray(len(inPoints))
for i, in_pt in enumerate(inPoints):
print(i, in_pt.x)
outPointB.addElement(i).setFloat(float(in_pt.x))
outPointsH.set(outPointB)
outPointsH.setAllClean()
Full code with 4 approaches, only one works:
https://pastebin.ubuntu.com/p/CZr7ytX9C6/
My use case is very specific (and I will probably settle for something
simpler), so I can live with floats instead of points.
Nevertheless I'd love to know how to dynamically set points array in API -
this things always make me trouble.
thanks !
-michal
On Saturday, July 3, 2021 at 1:22:35 PM UTC+2 Marcus Ottosson wrote:
> Sure, yes the end result can be compound attributes, but what I'm
> wondering is whether compound attributes are the root cause of the problem,
> or if it's elsewhere. As a test, if you were to replace the compound
> attribute with a float, does it still cause trouble? If so, then we know to
> look more closely into the compound attributes. If not, then we could
> strike that off. Either way, being one step closer to success.
>
> On Sat, 3 Jul 2021 at 11:56, f.mi...@gmail.com <f.mi...@gmail.com> wrote:
>
>> My initial goal was to be able to read specific vertex coordinates, for
>> example in expressions. So If I want to connect to, say
>> outPoints[3].outPointsX - then I think compound attributes are my only
>> choice.
>>
>> On Friday, July 2, 2021 at 11:30:24 AM UTC+2 Marcus Ottosson wrote:
>>
>>> Compound attributes always makes life hard. Does it behave any different
>>> with plain float attributes? I.e. can the problem be isolated to the
>>> compound attributes?
>>>
>>> On Fri, 2 Jul 2021 at 10:01, f.mi...@gmail.com <f.mi...@gmail.com>
>>> wrote:
>>>
>>>> I need a simple DG node that uses connected mesh and copies vertex
>>>> coordinates to output MPoint array.
>>>> I am having trouble with setting this array with MArrayDataBuilder. It
>>>> ether always stays zero-length or grows on every compute().
>>>> This surely must be simple to do, but I'm stuck. Can anybody help ?
>>>> One important detail - I need this array to be made of compound points
>>>> so that I can query individual coordinates as attributes.
>>>>
>>>> code:
>>>> https://pastebin.ubuntu.com/p/ZyY52k2dTN/
>>>>
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