[vtkusers] vtkScalarBarActor & Disappearing actors.

[Michael Bonner]

VTK users:

I am using vtk to visualize a bunch of polyhedra (blocks) and cylinders. 
Both the blocks and the cylinders have scalar values associated with their 
point data, and I have a lut & vtkScalarbarActor for each vtkDataArray. The 
two scalar bar actors are associated with a single renderer; all other data 
(blocks & cylinders) are associated with a different renderer. Both 
renderers are in the same window, but Have distinct sections of the view port.

I want to be able to change the vtkDataArray associated with either the 
blocks or the cylinders point data, rebuild the table, and then render the 
scene and then to be able to interact with the blocks and/or cylinders.

My problem is that some blocks or cylinders are just not visible sometimes. 
If I change data array & rebuild the table more blocks or cylinders may 
disappear, or they may be restored. There does not seem to be any ryhme or 
reason to what is happening. Sometimes, if I change the array & rebuild, a 
rectangle of color appears in another(unrelated) renderer in another 
section of the view port.

I have been dealing with this problem for a while and my current working 
solution is to keep the scalar bars in another vtkRenderWindow. If I do 
this their are no problems whatsoever.

Recently I thought that If i just removed the renderer with the blocks & 
cylinders from the window, then added the renderer with the scalar bar 
actors, rendered, removed the scalar bar renderer, and then put the 
block&cylinder renderer back in the window, that their would be no way that 
the scalar bar actors could interfere with the block & cylinder 
actors--this did not work.

Currently I have no idea why this is happening. If anybody at all has any 
idea or has seen any thing similar I would greatly appreciate it.

Thanks again & in advance.
Mike Bonner