[osg-users] osg::Camera, Viewport, FRAME_BUFFER, and the meaning of life

[Argentieri, John-P63223]

Robert,

It seems I've got my pixels all up in a bunch! 

I have:

1) a SceneView with:
View matrix = identity
Projection matrix = identity
Viewport = 0,0 to window width, window height

2) a pre render camera (renders texture successfully) with:
RELATIVE_RF
Target = FRAME_BUFFER
View matrix = identity
Projection matrix = ortho2d from 0,0 to texture width, texture height
Viewport = 0,0 to texture width, texture height

3) a nested render camera that draws a textured quad with:
ABSOLUTE_RF
View matrix = identity
Projection matrix = ortho2d from 0,0 to texture width, texture height
Viewport = 0,0 to window width, window height
Geometry = quad from 0,0 to texture width, texture height
Tex coords from 0,0  to 1,1


When I resize the window, I change only the viewports of the scene view
and the ABSOLUTE_RF camera.

When I run this in a window ~0.25 of desktop area, I only see ~0.25 of
the texture in the bottom left.
When I run this in a maximized window I see ~1.0 of the texture.

The biggest weirdness is that if I make the change to set the
RELATIVE_RF camera to FRAME_BUFFER_OBJECT, it works 100%.

Can you identify something that I've done wrong? 

A thousand thanks.

John Argentieri
Software Engineer
GENERAL DYNAMICS
C4 Systems 
(407) 281-5568
John.Argentieri at gdc4s.com

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