blend mode bug

As a result of ~~#332~~ the plugin now sets alpha blend for transmapped materials. This is not good. Transmapped materials should use alpha hash, and alpha blend should be used for thin glass only.

It is also reported in ~~#332~~ that alpha blend may have sorting issues. This is mainly why it’s not good for general purpose transparency.

# we have to use alpha blend only for thin glass if we use transparency
if thin glass and bsdf option
  eevee blend mode = alpha blend

Below a test with the toulouse hair, I converted the materials to uber before exporting.

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