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

Nigel Nunn nNunn at ausport.gov.au
Wed Apr 23 11:51:56 EDT 2003

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. 

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