static mesh exporter for blender to unity

export.py

from math import pi
import bpy
import os
import copy

# export to blend file location

dirname = os.path.dirname
basedir = dirname(dirname(dirname(bpy.data.filepath)))
export_dir = os.path.join(basedir, "Assets", "Models")

print("saving to " + export_dir)

if not export_dir:
    raise Exception("Blend file is not saved")

view_layer = bpy.context.view_layer

obj_active = view_layer.objects.active
original_selection = bpy.context.selected_objects
print(f"exporting {len(original_selection)} objects")


bpy.ops.object.select_all(action='DESELECT')

for obj in original_selection:
    name = bpy.path.clean_name(obj.name)
    print(f"exporting {obj.name} as {name}")
    
    # select the one object
    obj.select_set(True)

    original_location = copy.copy(obj.location)
    obj.location = (0, 0, 0)
    original_rotation = copy.copy(obj.rotation_euler)

    # apply an odd rotation
    obj.rotation_euler = (-pi/2, pi, 0)
    # scale this fucker
    obj.scale = (100, 100, 100)
    # apply our transforms
    bpy.ops.object.transform_apply(location=False, rotation=True, scale=True, properties=False)
    # actually don't fucking understand why this works
    obj.rotation_euler = (pi/2, 0, 0)


    # some exporters only use the active object
    view_layer.objects.active = obj

    fn = os.path.join(export_dir, name)
    print(f"exporting {name} to {fn}.fbx")

    # export the fbx with the weird rotation thing
    try:
        bpy.ops.export_scene.fbx(
            filepath=fn + ".fbx",
            use_selection=True,
            axis_forward='Z',
            axis_up='Y',
            global_scale=0.01,
            apply_unit_scale=True)
    except Exception:
        print(f"failed to export {name}")

    # apply the second rotation to undo the first one
    # bpy.ops.object.transform_apply(location=False, rotation=True, scale=True, properties=False)
    obj.location = original_location
    obj.rotation_euler = (pi/2, 0, pi)
    obj.scale = (0.01, 0.01, 0.01)
    bpy.ops.object.transform_apply(location=False, rotation=True, scale=True, properties=False)
    obj.select_set(False)

    print(f"written: {fn}.fbx")


view_layer.objects.active = obj_active

for obj in original_selection:
    obj.select_set(True)