[vtk-developers] broken vtkAssembly design

[Petar Petrov]

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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