[vtk-developers] broken vtkAssembly design

[David E DeMarle]

vtkMultiBlockData and allies.

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Thu, Mar 3, 2016 at 11:06 AM, Petar Petrov <pip010 at gmail.com> wrote:

>
>
> On Thu, Mar 3, 2016 at 5:00 PM, David E DeMarle <dave.demarle at kitware.com>
> wrote:
>
>> > However, you do agree it needs some fixing ? :)
>>
>> I don't think I've ever used assembly. I trust the list's finding that it
>> doesn't work with follower though!
>>
> Just curious. What do you use when you want to assemble a composite
> objects made out of a few actors together? vtkAppendPolydata and only one
> actor maybe?
>
>>
>> Once you make some progress, please do submit a merge request so people
>> can take a look at both the problem and solution. Ideally the merge will
>> have a test that demonstrates the feature and will ensure it stays fixed.
>>
>>
>>
>> David E DeMarle
>> Kitware, Inc.
>> R&D Engineer
>> 21 Corporate Drive
>> Clifton Park, NY 12065-8662
>> Phone: 518-881-4909
>>
>> On Thu, Mar 3, 2016 at 9:51 AM, Petar Petrov <pip010 at gmail.com> wrote:
>>
>>> Hi David,
>>>
>>> that's even better. However, isn't the camera info passed
>>> polymorphic-aly through some base class pointer?
>>> Or vtkFollower is listening on camera change? Let me dig in more.
>>>
>>> However, you do agree it needs some fixing ? :)
>>>
>>> Cheers,
>>> Petar
>>>
>>> On Thu, Mar 3, 2016 at 3:30 PM, David E DeMarle <
>>> dave.demarle at kitware.com> wrote:
>>>
>>>> Why not a "has a" pattern? Ie give the vtkAssembly an optional Camera
>>>> or Prop or what not ivar. If present, use it to make it act the way you
>>>> want.
>>>>
>>>> David E DeMarle
>>>> Kitware, Inc.
>>>> R&D Engineer
>>>> 21 Corporate Drive
>>>> Clifton Park, NY 12065-8662
>>>> Phone: 518-881-4909
>>>>
>>>> On Thu, Mar 3, 2016 at 4:16 AM, Petar Petrov <pip010 at gmail.com> wrote:
>>>>
>>>>> Hello community,
>>>>>
>>>>> quick question about redesign of vtkAssembly:
>>>>> A while back someone reported that vtkFollowers added to vtkAssembly
>>>>> loose their main feature, namely facing the camera at all times.
>>>>> However, this to be solved a major? redesign is needeed:
>>>>> vtkAssembly to inherit from vtkFollower and not vtkProp, so one can
>>>>> pass camera information to vtkAssembly via SetCamera method.
>>>>>
>>>>> Any idea why that is not the case? Is it trivial or there is more to
>>>>> it?
>>>>>
>>>>> at that point I am faced with 2 options, either fix vtkAssembly or
>>>>> drop its use and replace it with my own reinvent the wheel when it comes to
>>>>> composite 3D objects in vtk.
>>>>>
>>>>> Cheers,
>>>>> petar
>>>>>
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>>>>>
>>>>
>>>
>>>
>>> --
>>> All the best,
>>> Petar Petrov
>>> http://ppetrov.net
>>>
>>
>>
>
>
> --
> All the best,
> Petar Petrov
> http://ppetrov.net
>
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