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Recenty, I was making a plasma-like forcefield, and I found this material, which is almost what I wanted. So I copied the node setup, and I tried a test render, but it looked nothing like the render preview.

Render preview with correct material:

Render preview with correct material

Final render, but the material is wrong:

Final render, but the material is wrong

I am using Cycles BTW.

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  • $\begingroup$ I can not download the blend file, as I haven't got a Dropbox account any more. Could you (also for the future) upload the blend to blend-exchange.giantcowfilms.com please? That host will make sure the link stays valid in the future, thanks! $\endgroup$ – aliasguru Sep 3 '16 at 11:20
  • $\begingroup$ Updated it so hopefully it works now :) $\endgroup$ – Findus Sep 3 '16 at 11:23
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Strange things happen here, I suppose this is buried somewhere in Color Management or somehow the way Alpha is treated. If you turn off 'Transparent' in the 'Film' Section, the renders become identical.

Film -> Transparent

left: Viewport Render, right: Final Render, with Transparent turned off

enter image description here

The thing is that the ViewPort Render seems to Comp the Alpha against a different Color Value than the Final Render. If you render the image with Transparent Background, and Comp it using an Alpha Over node, you get these results here:

Split Viewer

The Split Viewer Node shows you (with a percentage slider) in this setup the raw render on the left, the comped image on the right. The darker you make the background, the more you see the texture. If the background becomes white, the texture disappears. So I have the suspicion the Render View node comps the Alpha values against white background, the Preview render against the checkerboard background.

See these tests of the very same render for comparison:

white BG

black BG

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  • $\begingroup$ That is really strange... But my problem is solved, so thanks! $\endgroup$ – Findus Sep 3 '16 at 12:35

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