function write_bones mesh file =-- writes bone related data to a file(		if mesh.modifiers[#skin] != undefined then	-- if there is a skin modifier	(		-- selecting the mesh and going into modify mode		-- is necessary for some of the following commands		select mesh		max modify mode						-- write out total bone count for the mesh		total_bone_count = skinops.getnumberbones mesh.modifiers[#skin]		writelong file total_bone_count #unsigned				for bone = 1 to total_bone_count do		-- loop through all the bones in this mesh		(			-- write out the name of this bone			bone_name = skinops.getbonename mesh.modifiers[#skin] bone 0			writestring file bone_name						-- retrieve the bone node by the name			bone_node = getnodebyname bone_name						controller = bone_node.position.controller;						for index = 1 to 2 do			(				-- write out keyframe count				keyframe_count = numkeys controller;				writelong file keyframe_count #unsigned							for keyframe = 1 to keyframe_count do				-- loop through all keyframes				(					-- get the time for this keyframe					keyframe_time = ( getkeytime controller keyframe ).frame as integer												-- write it to the file					writelong file keyframe_time #unsigned												-- retrieve the proper transform matrix for the bone					transform = bone_node.transform										if ( bone_node.parent != undefined ) then					-- if this isn't the root bone						-- apply the parent's transform on top						transform = transform * ( inverse ( bone_node.parent.transform ) )										if index == 1 then					-- if we are dealing with a positional keyframe					(						-- retrieve the translation (point)						translation = transform.translationpart											-- write out translation						at time keyframe_time writefloat file translation.x						at time keyframe_time writefloat file translation.y						at time keyframe_time writefloat file translation.z					)					else					-- we are dealing with a rotational keyframe					(						-- retrieve the rotation (quaternion)						rotation = transform.rotationpart;						-- write out rotation						at time keyframe_time writefloat file rotation.x						at time keyframe_time writefloat file rotation.y						at time keyframe_time writefloat file rotation.z						at time keyframe_time writefloat file rotation.w					)				)				controller = bone_node.rotation.controller;			)		)				for vertex = 1 to getnumverts mesh do		-- loop through all mesh vertices in this mesh		(			-- write out number of bones affecting this mesh vertex			vertex_bone_count = skinops.getvertexweightcount mesh.modifiers[#skin] vertex			writelong file vertex_bone_count #unsigned						for bone = 1 to vertex_bone_count do			-- loop through all the bones that affect this mesh vertex			(				-- write out the bone id for this mesh vertex				bone_id = skinops.getvertexweightboneid mesh.modifiers[#skin] vertex bone				writelong file bone_id #unsigned								-- write out the bone weight for this mesh vertex				weight = skinops.getvertexweight mesh.modifiers[#skin] vertex bone				writefloat file weight			)		)	)	else	-- there is no skin modifier		-- we have no bones		writelong file 0 #unsigned	)