I am rendering something black with transparent background. In the render window, however, I don’t see that thing because the background is black as well.
If you just use the Rhino render (Render Command) you can change the background @ the Environments:
Solid
Gradient
Environment
Wallpaper
are the options that you can choose from.
-Jordy
It’s set to solid white:
With the transparent option selected, that does not influence the background in the render window. So I get black on black, which is useless:
Well maybe thats because Rhino doesnt know how to show it. Save your img as an png and it will be transparant 
Exactly, that’s what the transparent option is for.
However, I need the image to be clearly visible in the render window, in order to be able to play with post effects, in this case DOF blur.
Maybe use a white background temporarely and then when your settings are good change it too transparant?
Setting the background temporarily to white is what I did. However, that slows down workflow quite a bit: It requires memorizing or saving post effect settings, and rendering times double.
I filed this as http://mcneel.myjetbrains.com/youtrack/issue/RH-29418 to make it easier with dark materials and previewing post effects in the future, thanks for the report.
Thanks, Brian!
Hi @BrianJ,
i think it should show a checkerboard instead of black color by default. While the alpha cannel is selected from the toolbar above the preview area, b&w would be preferred.
c.
That’s what I suggested in the bug report too… I’ll add the bit about showing this for alpha channel view as well.
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