[vtkusers] ray casting a synthetic model

[Wolfram H Volpi]

Hello, everybody.

Are there any VTK-ray-casting functions that can cast a ray directly onto
a synthetic model, without using intermediate voxels or polygons? 

VTK ray casting functions include for example,
vtkVolumeRayCastCompositeFunction, vtkVolumeRayCastMIPFunction, 
and vtkVolumeRayCastIsosurfaceFunction. But these examples all use
nearest-neighbor interpolation or linear interpolation methods to render a
voxel scene.

I need to render an isosurface of synthetic model WITHOUT using any
interpolations of data.  Has anyone tried that?

Thank you,
Wolfv