[vtkusers] vtkFixedPointVolumeRayCastMapper features

[Mario Medved]

Hi,

I was experimenting with vtkFixedPointVolumeRayCastMapper which is great, 
but I noticed 2 problems/features:

1. MIP blend mode causes black spots over some images. I think this is due 
space leaping, since vtkVolumeRayCastMapper does not have these problems.

2. When the shading is turned on, the gradient estimator works slower then 
in vtkVolumeRayCastMapper. On larger volumes this can be very lengthy 
operation. I checked the source code and there is just block of code for 
calculating gradient values directly without any multiprocessor support. 
vtkVolumeRayCastMapper uses gradient estimator object which does all 
calculations with miltiproc support, but I am not sure why this code is not 
used in vtkFixedPointVolumeRayCastMapper.

If anyone solved these problems, please let mo know, so I do not rediscover 
hot water.

Thanks,
Mario 
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