[vtkusers] save a 3D perspective view as an image

[Thomas Obenaus]

Hi ToulGen,

here is a short code-snipped (Java) which resolved the problem form me:

vtkRenderer renderer = this.canvas3D.GetRenderer( );	
vtkRenderLargeImage renderLarge = new vtkRenderLargeImage( );
renderLarge.SetInput( renderer );
renderLarge.SetMagnification( 1 );
	
// write the view to png-file
String filename = "test.png";
vtkPNGWriter png_w = new vtkPNGWriter( );
png_w.SetInput( renderLarge.GetOutput( ) );
png_w.SetFileName( filename );			
png_w.Write( );

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