[vtkusers] Polydata filtering in real-time

Nil Goyette nil.goyette at imeka.ca
Wed Jun 4 17:04:14 EDT 2014

Hi Cory,

Thanks for the answer. I wasn't aware that ImmediateModeRendering did 
exactly that. (Btw, it's On, not Off). I tried what you suggested and it 
does make the application faster, but not as fast as what I had before. 
If I don't modify the mapper, I must create another vtkPolyData each 
time I move my cube, then the standard mapper renders it. This gets me 
near 10fps.

In my version, I modified the mapper to receive a set<vtkIdType>* (the 
cells passing in the box) and a polydata* (all the fibers), so it 
renders only the required cells. (it doesn't even render its input 
object... it's a hack, I know). With this, there's no useless 
points/cells copy. If there's a cleaner way to do it, I'm all ears :)

Le 2014-06-04 14:55, Cory Quammen a écrit :
> Hi Nil,
> You shouldn't actually need to modify the code. You should just be 
> able to turn off use of OpenGL display lists with 
> vtkMapper::ImmediateModeRenderingOff().
> http://www.vtk.org/doc/nightly/html/classvtkMapper.html#ab9db044b3f5113808d2de42f13bb4fe8
> Let us know if that gives you the same near-real-time updates that 
> removing calls to glNewList does.
> Thanks,
> Cory
Logo Imeka <http://imeka.ca/> 	Nil Goyette, M.Sc.
www.imeka.ca <http://imeka.ca/>

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