[vtkusers] How to save a updated image etc..

[Koichiro Suzuki]

Hello all.
 Are there good ideas?

1. How to save a updated image
 I would like to save a new image after updating the camera position, cutting pl
ane
and so on. But I can't save the updated image after changing these value.
 The following code changes azimuth and saves images. But "camara.1.jpg"
is just same as "camera.0.jpg".
 My coding is wrong..?

---------------------------------------------------------------
package require vtk
package require vtkinteraction
package require vtktesting

vtkPLOT3DReader pl3d
    pl3d SetXYZFileName "$VTK_DATA_ROOT/Data/combxyz.bin"
    pl3d SetQFileName "$VTK_DATA_ROOT/Data/combq.bin"
    pl3d SetScalarFunctionNumber 100
    pl3d SetVectorFunctionNumber 202
    pl3d Update

vtkStructuredGridGeometryFilter plane
    plane SetInput [pl3d GetOutput]
    plane SetExtent 1 60 1 60 7 7

vtkLookupTable lut
vtkPolyDataMapper planeMapper
    planeMapper SetLookupTable lut
    planeMapper SetInput [plane GetOutput]
    eval planeMapper SetScalarRange [[pl3d GetOutput] GetScalarRange]
vtkActor planeActor
    planeActor SetMapper planeMapper

vtkStructuredGridOutlineFilter outline
    outline SetInput [pl3d GetOutput]
vtkPolyDataMapper outlineMapper
    outlineMapper SetInput [outline GetOutput]
vtkActor outlineActor
    outlineActor SetMapper outlineMapper

lut SetNumberOfColors 256
lut Build
for {set i 0} {$i<16} {incr i 1} {
    eval lut SetTableValue [expr $i*16] $red 1
    eval lut SetTableValue [expr $i*16+1] $green 1
    eval lut SetTableValue [expr $i*16+2] $blue 1
    eval lut SetTableValue [expr $i*16+3] $black 1
}

vtkRenderer ren1
vtkRenderWindow renWin
    renWin AddRenderer ren1

ren1 AddActor outlineActor
ren1 AddActor planeActor

ren1 SetBackground 0.1 0.2 0.4
ren1 TwoSidedLightingOff

renWin SetSize 250 250

set cam1 [ren1 GetActiveCamera]
renWin Render

# write a initial image
vtkWindowToImageFilter w2i
        w2i SetInput renWin
vtkJPEGWriter writer
        writer SetInput [w2i GetOutput]
        writer SetFileName "camara.0.jpg"
        writer Write

# changing Azimuth
$cam1 Azimuth 30
renWin Render

# write a updated image , but the written image is not updated
        w2i Update
        writer SetFileName "camara.1.jpg"
        writer Write

exit
---------------------------------------------------------------

2. How to get the grid mesh size
 The above code uses a vtkPLOT3DReader class.
 Can we get the grid mesh size ?
 We could "SetExtent 1 60 1 60 7 7" ,if we knew sizes previosly.
 But I would like to get sizes dinamically.


Best regards.

Koichiro Suzuki
suz at mito.ssd.ssg.fujitsu.com