Generating preview images fails

[Spiritdude]

Platform: Ubuntu 22.04 LTS
Program: UVtoolsCmd 1.0.6 (as part of UVtools_linux-x64_v3.12.1.zip, downloaded 2023/03/23)

I can't seem to convert files to image, same error for .sl1, .pwma, or .ctb, here with a .sl1 file:

% ~/Projects/UVtools/bin/UVtoolsCmd convert tests/v-wheels.sl1 Image test9.png
Opening file v-wheels.sl1: Done in 1.28s               
Converting to test9.png: Unhandled exception: System.NotImplementedException: The method or operation is not implemented.
   at UVtools.Core.FileFormats.ImageFile.set_ResolutionX(UInt32 value) in UVtools.Core/FileFormats/ImageFile.cs:line 41
   at UVtools.Core.FileFormats.FileFormat.<>c__DisplayClass792_0.<Convert>b__1() in UVtools.Core/FileFormats/FileFormat.cs:line 5049
   at UVtools.Core.FileFormats.FileFormat.<>c__DisplayClass796_0.<SuppressRebuildPropertiesWork>b__0() in UVtools.Core/FileFormats/FileFormat.cs:line 5198
   at UVtools.Core.FileFormats.FileFormat.SuppressRebuildPropertiesWork(Func`1 action, Boolean callRebuildOnEnd, Boolean recalculateZPos, String property) in UVtools.Core/FileFormats/FileFormat.cs:line 5216
   at UVtools.Core.FileFormats.FileFormat.SuppressRebuildPropertiesWork(Action action, Boolean callRebuildOnEnd, Boolean recalculateZPos, String property) in UVtools.Core/FileFormats/FileFormat.cs:line 5196
   at UVtools.Core.FileFormats.FileFormat.Convert(Type to, String fileFullPath, UInt32 version, OperationProgress progress) in UVtools.Core/FileFormats/FileFormat.cs:line 5041
   at UVtools.Core.FileFormats.FileFormat.Convert(FileFormat to, String fileFullPath, UInt32 version, OperationProgress progress) in UVtools.Core/FileFormats/FileFormat.cs:line 5153
   at UVtools.Cmd.Symbols.ConvertCommand.<>c__DisplayClass0_0.<CreateCommand>b__1() in UVtools.Cmd/Symbols/ConvertCommand.cs:line 181
   at UVtools.Cmd.Program.ProgressBarWork[T](String title, Func`1 action) in UVtools.Cmd/Program.cs:line 138
   at UVtools.Cmd.Symbols.ConvertCommand.<>c.<CreateCommand>b__0_0(FileInfo inputFile, String targetTypeExt, FileInfo outputFile, UInt16 version, Boolean noOverwrite) in UVtools.Cmd/Symbols/ConvertCommand.cs:line 176
   at System.CommandLine.Handler.<>c__DisplayClass6_0`5.<SetHandler>b__0(InvocationContext context)
   at System.CommandLine.Invocation.AnonymousCommandHandler.Invoke(InvocationContext context)
   at System.CommandLine.Invocation.AnonymousCommandHandler.InvokeAsync(InvocationContext context)
   at System.CommandLine.Invocation.InvocationPipeline.<>c__DisplayClass4_0.<<BuildInvocationChain>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c__DisplayClass17_0.<<UseParseErrorReporting>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c__DisplayClass12_0.<<UseHelp>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c__DisplayClass22_0.<<UseVersionOption>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c__DisplayClass19_0.<<UseTypoCorrections>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c.<<UseSuggestDirective>b__18_0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c__DisplayClass16_0.<<UseParseDirective>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c.<<RegisterWithDotnetSuggest>b__5_0>d.MoveNext()
--- End of stack trace from previous location ---
   at System.CommandLine.Builder.CommandLineBuilderExtensions.<>c__DisplayClass8_0.<<UseExceptionHandler>b__0>d.MoveNext()

The same happens when I try .jpg, .tif as extensions.

I was able to run

% ~/Projects/UVtools/bin/UVtoolsCmd convert tests/v-wheels.ctb SL1 tests/a.sl1
Opening file v-wheels.ctb: Done in 0.74s               
Converting to a.sl1: Done in 1.69s        

and generated valid .sl1 file.

Is there a solution or what I am missing?

[sn4k3]

You can't convert a file format to Image, as error say the convert/encoder for image file format is not implemented since it makes no sense to convert a file format to single image.

If you want to export images from file formats you must use Operations with the command run and pass a prebuilt .uvtop that can be generated from the UI, see this

To generate the .uvtop follow:

As easier alternative use the extract command which extracts everything from file format: layers, thumbnails, metadata

PS: TIF format was drop to ease dependencies and reduce library size

[Spiritdude]

Thanks for the explanation.

I recommend

• to provide a simpler error message, as now it seems like a bug, but having "you cannot convert this file format into an image", and exit, without printing the entire list of stack of function calls
• not list 'Image' as output format for convert command as long there is none implemented

I'm currently coding my own tool in Python to handle various formats, and UVtools with its git repo here has been an immense valuable resource to implement the support for various file formats - thanks for that.

Btw, a quick way to generate preview images from layer images is to resize x:1, y:0.7 and stack those images from bottom to top, giving pseudo perspective, this saves to render voxels in 3d space.

I use this method to create preview thumbnails for Nautilus File Browser (the default file browser under Gnome), here .sl1, .pwma and .ctb:

I just started to use UVtools on the command-line, and I haven't explored the Python bindings yet. I really struggled to get UVtools working from sources, but now used the .zip approach as shortcut.

Thanks for maintaining this wealth of code :-)

[sn4k3]

To generate thumbnails you can also use the heatmap from UVtools, it will do some kind of x-ray image in Z axis but won't be perceptible for every model.
eg: