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    $\begingroup$ Don’t. Use. PNG. Ever. Use EXRs. Always. $\endgroup$ Commented May 11, 2021 at 12:47
  • $\begingroup$ @troy_s if I save with EXRs, it works better indeed (but it does not solve the problem of the preview: I need to manually add a black background with alpha over to make it appear), thanks! But what's wrong with PNG? Is the high dynamic range an issue here? It's super strange: if I import the .EXR in krita and save it as .png, I lose again the transparency! I really can't make it work with PNG? EXRs files are huge: 19.1MB (EXR) vs 334KB (.PNG) for the same file... $\endgroup$ Commented May 11, 2021 at 13:05
  • $\begingroup$ @troy_s Who it's super strange: GIMP does not displays transparency of these files properly while Krita can (but the result is quite brighter). Also, I can't anymore convert back to .PNG: I lose all colors that are in the transparent part when doing so! (and .EXR files are too big for my needs) $\endgroup$ Commented May 11, 2021 at 13:26
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    $\begingroup$ PNG is the problem; it doesn’t encode alpha properly. As a result, it doesn’t work. EXRs do in Blender. Simple alpha over and done. Plenty of good posts on this site to explain it. Worth some time. $\endgroup$ Commented May 12, 2021 at 2:08
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    $\begingroup$ i just downloaded your blend file ....connected your laser to the viewer and got...[![enter image description here][1]][1] [1]: i.sstatic.net/ZMQ4I.jpg. ....is this what you want or did i misunderstood...? $\endgroup$ Commented May 12, 2021 at 6:33