i lost trace of the original topic
anyway i did found finally the modified source of plugin as lighting effect and map object and other ten that i hacked for a better preview
i just a trivial hack, simply replacing the hardcoded value for preview size from 100x100 to 600x400 , but was working

now i am not sure how compile the single plugins (the first time to solve i recompiled all gimp, replacing first the plugin folder
in the source the
well as now i am really busy,( also because something went wrong reinstalling linux on my father desktop, no data loss but bootloader , mbr and maybe something else went MIA ...so i have to back up everything and then reinstall everything )

anyway i will upload the plugin folder at soon i get up (here 5 in the morning..really time for a nap ) and if somebody want help to compile will be appreciated