[vtkusers] Actors disappearing on zoom - Video!

[David.Pont at ForestResearch.co.nz]

Hi Alex,
  I just can't resist a good movie...
  Is this a lighting effect? The branches seem to become increasingly
shaded until they merge with the black background. Have you set up a
positioned light source instead of the default 'headlight'? Would a white
background clarify if black shading is making the branches disappear? The
branch size effect may be due to resolution in the shading calculations. As
you zoom out, a branch surface decreases towards being a just pixel or so
wide 'on-screen', and its averaged surface normal may point further and
further away from the camera.

  just guessing,  Dave Pont



                                                                                                                                   
                    "Alex Lear"                                                                                                    
                    <alear at cns.montana.edu>       To:     "vtk users" <vtkusers at public.kitware.com>                                
                    Sent by:                      cc:                                                                              
                    vtkusers-admin at public.k       Subject:     [vtkusers] Actors disappearing on zoom - Video!                     
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                    01/08/2002 11:20                                                                                               
                                                                                                                                   
                                                                                                                                   




Hello, I have about 1000 actors that make up a branch structure.  As I zoom
away from them they seem to disappear depending on their size.  It doesn't
seem to be a clipping issue because they don't seem to disappear depending
on placement but by size.  If someone knows how to stop this disappearing I
would like to know.  I have made a movie of this and posted it at
http://www.eotbat.com/Branch_Dissolve.avi .  It is a little under 5MB.
Sorry about the size but it needed to be large and good quality to see this
problem.

Thanks for helping and any help is appreciated.

Alex Lear

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