[vtkusers] Edges and Solids

[Sean McInerney]

vtk at scil.sinp.msu.ru wrote:
> On Wed, 28 Jul 2004, Sean McInerney wrote:
> 
>>> ieh.... it is dramatically slow if number of objects is over 10-20 
>>> (eats 35% of CPU).
>>> I have 180-200 objects...
>>
>> As long as you do not need to select and drag the actors around as a 
>> unit, you can try vtkPropAssembly. This should function similarly for 
>> picking, but without the shared matrix stack evaluation done by 
>> vtkAssembly. Note that vtkAbstractPicker subclasses implement a number 
>> of methods that will be of use: GetProp(), GetAssemblyPath(), and 
>> GetPropAssembly().
> 
> Thanx!
> 
>> I am assuming that you want to maintain a separate vtkProperty and/or 
>> vtkTexture for each Actor. If this is not important, consider using 
>> vtkAppendPolyData to combine all or similar PolyData sources for use 
>> with a single Mapper and Actor.
> 
> what about colors for each cell of such an (all-in-one) actor?
> or color is the property of the actor as whole?
> 

The all-in-one actor could have cell scalars used with a lookup table 
for coloring. As far as I know, this will only affect the front faces. 
The only way to affect the back faces is via the actor's BackProperty.

-Sean