artifact while rendering glass in tmesh solved?

Hi group,

Can the artifact which occurs when rendering glass in a tmesh
(obj2tmesh) be solved? This artifact has already been described in the
following thread, but it does't seems to be followed up by an answer.
Any help would be appreciated.

http://www.radiance-online.org/pipermail/radiance-general/2005-June/002777.html

Thanks,

Iebele