func _getImportOptions(path: String)Override to add general import options. These will appear in the main import dock on the editor. Add options via addImportOption(name:value:) and addImportOptionAdvanced(type:name:defaultValue:hint:hintString:usageFlags:).
func _getInternalImportOptions(category: Int32)Override to add internal import options. These will appear in the 3D scene import dialog. Add options via addImportOption(name:value:) and addImportOptionAdvanced(type:name:defaultValue:hint:hintString:usageFlags:).
func _getInternalOptionUpdateViewRequired(category: Int32, option: String) -> VariantReturn true whether updating the 3D view of the import dialog needs to be updated if an option has changed.
func _getInternalOptionVisibility(category: Int32, forAnimation: Bool, option: String) -> VariantReturn true or false whether a given option should be visible. Return null to ignore.
func _getOptionVisibility(path: String, forAnimation: Bool, option: String) -> VariantReturn true or false whether a given option should be visible. Return null to ignore.
func _postProcess(scene: Node?)Post process the scene. This function is called after the final scene has been configured.
func _preProcess(scene: Node?)Pre Process the scene. This function is called right after the scene format loader loaded the scene and no changes have been made.