Bug Exporting To PNG

MikalDev

I am using C3 for game development, there is not yet a runtime for the C3 engine, so I am exporting spritesheets from Spine. When I export to PNG, I get the an error reported and repeated also in the spine.log (though the export actually works and I can use the result.)

PackingWriting 4048x858: D:\Projects\warrern-dm-construct\Assets\Rabbit Portraits\skeleton-animation.png
java.lang.RuntimeException: Error packing images.
Caused by: java.lang.Exception: Error processing directory: C:\Users\danps\AppData\Local\Temp\spine2171491910963887495.tmp
Caused by: is: Error reading pack file: D:/Projects/warrern-dm-construct/Assets/Rabbit Portraits/skeleton-animation.png
Caused by: is: Invalid line:

Attached is the Spine.log

MikalDev

Mario

Sorry for the troubles. Could you maybe send us your project via email (contact@esotericsoftware.com) so we can have a look? Please include both the .spine and image files.

MikalDev

Ok, will do, I'll send them tomorrow.

Sent.

Erika

Found the problem! sincerly thank you for providing the screenshots of your settings because it made things easier!
Atlas extension should be .atlas and not .png (:
The Atlas file is a text file (you can also use the .txt extension, some do) that lists the images position, name and orientation, therefore it can't be written in an image format. Without it you would just have a sequence of images in a single file but no knowledge of the start and end of each of the images stored inside. (you can always guess the size of them, though 😛 this is just to make your life easier)
If you don't want them in a single file, you can always uncheck Create atlas and export in a folder to have each frame exported in a single png file instead.

MikalDev

Thanks for the help, that worked. C3 does not actually seem to use the Atlas on import, instead I need to manually figure out the total row/col of the resulting spritesheet, so it gets imported correctly, perhaps I can look at the Atlas to figure that out quickly rather than visually counting sprites in the spritesheet.

Lower priority, but you may want to idiot-proof that extension box (e.g. if not valid extension, let the user know.)

Nate

That was a tricky gotcha. We now prevent using a .png extension starting in 3.7. 🙂

Maybe you could use the grid packing option to pack into a grid rather than an atlas.
Texture Packing - Spine User Guide: Output

MikalDev

Thanks for the pointer to the Guide, but if I don't enable Atlas for the using Export, I get separate files (1 *.png per frame), instead of a spritersheet (just to be clear, I already get a 'grid' spritersheet with Atlas enabled.)