Hey, I installed the MDL exporter plugin for Blender. I imported a working MDX file and tried to export it to MDL but got this error (the exported MDL also could not be opened):
Traceback (most recent call last):
File "C:\Users\Master\AppData\Roaming\Blender Foundation\Blender\2.79\scripts\addons\export_mdl\__init__.py", line 98, in execute
export_mdl.save(self, context, **keywords)
File "C:\Users\Master\AppData\Roaming\Blender Foundation\Blender\2.79\scripts\addons\export_mdl\export_mdl.py", line 1308, in save
write_billboard(fw, bone.billboarded, bone.billboard_lock)
AttributeError: 'Object' object has no attribute 'billboarded'
location: <unknown location>:-1
location: <unknown location>:-1
As for sounds and triggers: sorry, i don't have time to help you with that right now. The trigger is not hard to make yourself though if you make an effort. Thanks, glad you like it!