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I was trying to create some bubbles. Everything was OK in render preview, but render result becomes completely transparent image. enter image description here

Here you can see render preview. I use HDRi lighting and film transperant. First sample in render process shows a bit of "envelope" of each bulb. enter image description here

Here you can see render at 2-3 samples and it's almost invisible. enter image description here

here is a gif when render runs... enter image description here

Here is my node setup. I can upload my .blend file if you help me how to do this:) Yes, bubbles are visible, but it brings black background and some bugs. enter image description here

And the most interesting thing i found when i tried to save this image with black background without alpha. THIS is the saved rendered image from previous screen!

Here is the comparison between rendered image and render preview at 1 sample. enter image description here And at 2 samples. enter image description here

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  • $\begingroup$ Is this possible to fix camera or rendering setting to get rid of the problem??? I don't really want to change my node setup because i like how it looks.... $\endgroup$ – Iced Dec 5 '17 at 14:03
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    $\begingroup$ Are bubbles visible if you put channels of the image in UV Image editor to RGB without Alpha? (buttons to the right from the Image selector). $\endgroup$ – Mr Zak Dec 5 '17 at 14:29
  • $\begingroup$ I don't see how 'more samples' makes the image disappear if you are using the same amount of samples for the preview and the final render? $\endgroup$ – Ray Mairlot Dec 5 '17 at 14:32
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    $\begingroup$ Most likely there is nothing wrong with your file. This is an issue with the viewer. Read: blender.stackexchange.com/questions/56950/… and blender.stackexchange.com/questions/87837/… $\endgroup$ – user1853 Dec 5 '17 at 14:50
  • $\begingroup$ Yes bro, this is the save problem. I can see my bubbles if i use alpha over node with black background.... Thank you. $\endgroup$ – Iced Dec 5 '17 at 15:13