[vtkusers] Light bug ... (Better explained)

[Nigel Nunn]

Hi Sebastien, 
 
> As you can see in the "after.jpg" image, the red sphere 
> doesn't seem to update the way its receiving light ! 
 
Thanks for so neatly illustrating the problem. I feel this may 
be related to a lighting problem I wrote about earlier: images 
rendered off-screen are not getting the same user-defined lights 
currently applied to images rendered on-screen. 
 
One of the following may need adjustment: 
 
 1. our updating of time-stamps, or
 2. the logic used for updating the lights 
    in the low-level Render operations 
 
vtkRenderer::Render() makes a fairly complicated test of 
when and what to "update".  If a call to Render() does in 
fact trigger a call to DeviceRender(), then DeviceRender() 
tries to get the lighting right.  I have not yet stepped 
through a debug version to work out what needs to happen. 
 
Nigel 
 
 

**********************************************************************
This message is intended for the addressee named and may contain 
confidential and privileged information. If you are not the intended 
recipient please note that any form of distribution, copying or use of
this communication or the information in it is strictly prohibited and
may be unlawful. If you receive this message in error, please delete it
and notify the sender.

Keep up to date with what's happening in Australian sport.
Visit http://www.ausport.gov.au
**********************************************************************