Upgrade according to Blender Material.blend_method, Material.show_transparent_back deprecation.

[Richardn2002]

Related to #255.

I am not sure checking for the existence of a GREATER_THAN math node on the material is the right way to go, but this feels like the only way to check for user intention.

[Richardn2002]

... check failed cause on the test machine Blender version is at 3.0. I know nothing about your "Minimum Supported Blender Version" policy, so go ahead and either

• modify my branch to include branches based on Blender version for this part of logic.
• close this PR if you do not intend to support latest Blender.

[paroj]

I know nothing about your "Minimum Supported Blender Version" policy

there is no minimum supported blender version as one can always go back to older releases.
However, it is essential that the CI is working.

Also I still cannot reproduce your issue with blender 4.4. Transparency is only written only if enabled and transparency overlap also works.

Only alpha testing does not work on those blender versions.
Feel free to add a branch based on hasattr() to handle it.