vsgscreenshot can produce strange output

[rainergericke]

Sometimes vsgscreenshot produces suboptimal output. The model shown on the screen looks good, but the saved color file can be suboptimal.
Screen output (Mac but Windows and Linux look the same:
vsgcreenshot models/lz.vsgt --cf theShot.png

The trees look strange in the png file:

Png file produced on Winows looks like this:

Similar does Linux:

[robertosfield]

I have seen the same visuals, I suspect there is something about way the blending is done in the lz.vsgt model, it's setting the color and alpha value of the framebuffer in a way doesn't cause obvious problems when rendering on screen, but when saving to file and then using a texture the blending causes problems.

The lz.vsgt model was converted from OpnSceneGraph-Data/lz.osgt using osg2vsg which needs rewriting, the rewrite will lead to a different set of state that lz.vsgt would apply and might fix this issue,

It would be worth trying out other non OSG related models to see if they exhibit the same artifact.

[rainergericke]

lz.vsgt was the only problematic model file I found so far. So maybe this is a very special problem.