3D Graphics & Viz

vtkElevationFilter

generate scalars along a specified direction.

vtkElevationFilter is a filter to generate scalar values from a dataset. The scalar values lie within a user specified range, and are generated by computing a projection of each dataset point onto a line. The line can be oriented arbitrarily. A typical example is to generate scalars based on elevation or height above a plane.

vtkElevationFilter範例:

vtkElevationFilter *elev = vtkElevationFilter::New();
        elev->SetInput( shrink->GetOutput() );
        elev->SetLowPoint(-1,-1,-1);
        elev->SetHighPoint( 1, 1, 1);
        elev->SetScalarRange(0,1);

vtkElevationFilter *elev=vtkElevationFilter::New();
        elev->SetInput(iso->GetOutput());
        val = (myid+1) / static_cast(numProcs);
        elev->SetScalarRange(val, val+0.001);

APIs:

• SetLowPoint: Define one end of the line (small scalar values).
• SetHighPoint: Define other end of the line (large scalar values).
• SetScalarRange: Specify range to map scalars into.

Monday, February 13, 2006 # posted by samuel @ 7:26 PM