[vtkusers] vtkFixedPointVolumeRayCastMapper producing incorect results.

[Kevin H. Hobbs]

On Friday 07 November 2008 11:28:23 am Amy Squillacote wrote:
> Are you using the same color and opacity transfer functions in both cases?
>
> - Amy
>

They should be very nearly the same.

In PV I just selected the black body colors and moved the first point to 0. So 
the max was left at the dataset max of 24821.

In VTK I set high and low on the command line to 0 and 2.8e4. the opacity and 
Color were:

	// Opacity
	vtkPiecewiseFunction * opacity 
		= vtkPiecewiseFunction::New();
	opacity->AddPoint( low,  0.0 );
	opacity->AddPoint( high, 1.0 );

	  // Color
	vtkColorTransferFunction * color_trans 
		= vtkColorTransferFunction::New();
	color_trans->AddRGBPoint( low, 0.0, 0.0, 0.0 );
	color_trans->AddRGBPoint( low + 1.0 * ( high - low ) / 3.0, 1.0, 0.0, 0.0 );
	color_trans->AddRGBPoint( low + 2.0 * ( high - low ) / 3.0, 1.0, 1.0, 0.0 );
	color_trans->AddRGBPoint( high, 1.0, 1.0, 1.0 );

This same opacity and color transfer function code block works fine with the 
unstructured grid mappers.
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