[vtkusers] vtkImageReslice speed

[David Gobbi]

Hi Lyubomir,
 
 There is nothing special about the number "256" in vtkImageReslice,
 so the loss of performance is probably due to a secondary issue.
 
 For example, if you are using vtkImageActor or vtkImagePlaneWidget
 to display the image, note that the size of the OpenGL texture is always
 a power of two, so an image that is 257 pixels on a side will be displayed
 on a texture that is 512 pixels on a side.
 
  - David

 
----- Original Message ----
From: Lyubomir Zagorchev <lzagorch at verizon.net>
To: vtkusers at vtk.org
Sent: Saturday, March 25, 2006 11:45:15 AM
Subject: [vtkusers] vtkImageReslice speed

       I am using vtkImageReslice to cut three orthogonal cross sections from  a volume.
 I noticed that if the volume has axial dimensions greater than 256 the  performance 
 of the filter becomes very slow ( even if the axial  dimensions are 257, the speed
 decreases significantly). Could someone briefly explain what is the reason  for 
 that? Can I do something in my code that will increase the speed of  the filter?
  
 Thank you,
  
 Lyubomir 
  
  

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