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List: vtkusers
Subject: [vtkusers] Displaying planes from a volume
From: "John Wilson" <jpw () creare ! com>
Date: 2001-04-30 18:15:05
Message-ID: 000901c0d1a1$7b73f270$945b50c0 () jpw ! creare ! com
[Download RAW message or body]
In my Tcl program I read in a series of TIFF image slices, create a volume,
and then display three orthogonal cut planes through the data. Here is a
piece of code that I use to extract a Z slice in the XY plane. I present 2
different options for extracting the slice:
----------------------------------------
if { 1 } {
#
# Option 1: Use a plane source to extract data of interest
#
vtkExtractVOI xySection
xySection SetVOI $x_sliceMin $x_sliceMax $y_sliceMin $y_sliceMax
$z_sliceNumber $z_sliceNumber
xySection SetInput [reader GetOutput]
# This vtkTexture provides the color mapping for displaying the data
vtkTexture xyTexture
xyTexture SetInput [xySection GetOutput]
xyTexture InterpolateOn
xyTexture SetLookupTable bwLut
xyTexture MapColorScalarsThroughLookupTableOn
vtkPlaneSource xyPlane
xyPlane SetXResolution 1
xyPlane SetYResolution 1
xyPlane SetOrigin $x_sliceMin.0 $y_sliceMin.0 $z_sliceNumber.0
xyPlane SetPoint1 $x_sliceMin.0 $y_sliceMax.0 $z_sliceNumber.0
xyPlane SetPoint2 $x_sliceMax.0 $y_sliceMin.0 $z_sliceNumber.0
vtkPolyDataMapper xyMapper
xyMapper SetInput [xyPlane GetOutput]
xyMapper ImmediateModeRenderingOn
vtkActor xyActor
xyActor SetMapper xyMapper
xyActor SetTexture xyTexture
} else {
#
# Option 2: Use a geometry filter to extract data of interest
#
vtkStructuredPointsGeometryFilter xyPlaneData
xyPlaneData SetInput [reader GetOutput]
xyPlaneData SetExtent $x_sliceMin $x_sliceMax $y_sliceMin $y_sliceMax
$z_sliceNumber $z_sliceNumber
vtkPolyDataMapper xyMapper
xyMapper SetInput [xyPlaneData GetOutput]
xyMapper ImmediateModeRenderingOn
vtkActor xyActor
xyActor SetMapper xyMapper
}
--------------------------------------------
A couple questions about the 2 different options I use:
1. The data rendered using Option 2 (uses vtkStructuredPointsGeometryFilter)
is rotated 90 degress from that displayed with Option 1 (uses
vtkPlaneSource). Does anyone know why?
2. Rendering is very speedy using Option 1 (uses vtkPlaneSource ) compared
to Option 2 (uses vtkStructuredPointsGeometryFilter). Is this because
Option 2 uses ray tracing for rendering the plane?
Thanks -
John
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