[vtkusers] Image plane widget + color transfer function?

[dean.inglis at camris.ca]

Hi Paul,

you can add a vtkColorTransferFunction to vtkImagePlaneWidget:
e.g.

vtkColorTransferFunction colors
  colors SetRange  $dataMin $dataMax
  colors AddRGBPoint $dataMin  0 0 1
  colors AddRGBPoint $dataMax  1 0 0 
  colors SetColorSpaceToRGB
  colors Build

vtkImagePlaneWidget planeWidgetX
  [planeWidgetX GetColorMap] SetLookupTable colors

the only thing that won't work will be window/levelling

Dean


Hello, Is there any way to accomplish the following: 1. Given a structured points set of integers (cell counts generated by a simulation, in this case) 2. Define a color transfer function based on threshold values (i.e. 0..999 cells - red, 1000-99999 green, etc). 3. Use a vtkImagePlaneWidget to slice through the volume using the above c.t.f. I can't seem to get it done without a lot of hoops to jump through. The problem lies in the fact that the vtkImagePlaneWidget can not use a c.t.f., only a vtkLookupTable. For this dataset the scalar values have a range of roughly [0,1500000] requiring a large lookup-table if done with vtkLookupTable, which feels like I'm abusing the class. Thanks in advance for any help, Paul