Chaos Corona for Cinema 4D > [C4D] I need help!

Understanding saving file: CXR / .exr / .rla?

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caspian:
Here's a screen capture
1st Save by clicking on Save and saving it as default OpenEXR. The saved file is .RLA (I can't open this)
2nd Save by Save CXR. Only option is Corona EXR. Saved file is .CXR (I can't open this)
3rd Save by Save All. Again saved as OpenEXR. The saved file is .EXR which I can open.

I don't understand what the purpose of the RLA and Corona EXR files, although as I mentioned before they are the formats that unless I deliberately avoid it saves it as.

https://www.dropbox.com/s/lhngvdb2mf249hn/Corona-saving.mp4?dl=0

caspian:
Here are two more save tests.

1st save (x) I don't select the save format which is already set to the default OpenEXR. Resultant file is .RLA
2nd save (y) I select the already selected default. Resultant file is .EXR.

Maybe this is a bug (on Mac)?

https://www.dropbox.com/s/hljgd5xpak02yhr/Saving%20part%202.mp4?dl=0

TomG:
TY for the videos!

CXRs you can open in the Corona Image Editor, or use to Resume Render, or rename to EXR to open them in other applications. As noted this is the Corona specific version of EXRs, for Corona to use (CIE, Resume Render), so only Corona can open them.

For the rla, I definitely don't get that on Windows. What happens if you uncheck save alpha, as I am not sure EXRs use alpha so it could be it saves an extra file for the alpha and for reasons known only to C4D it picks rla (the save dialog here is C4Ds save dialog, invoked from Corona, so anything it does is in fact C4D at work, as I understand it, and not Corona specific). What happens if you save from the C4D picture viewer, the same thing, or something different? Also, what happens if you pick something that is not EXR and does support alpha, like PNG? Does it still create an rla?

As noted too, the rla is nothing to do with Corona either, it's a wavefront file, so very old and never ever used by Corona to save, load, or anything else, now or at any point in the past :)

caspian:
Answers:
The test scene doesn't have the Alpha channel checked in the Render Settings.
If I select PNG it renders PNG as expected (no rla file)

TomG:
It's not the alpha in the scene I was curious about, but the "Save alpha" checkbox in the file options dialog that pops up. Rather than just hit OK when that comes up, what happens if you disable the Save Alpha checkbox in that and then hit ok?

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