"nemesis" <nam### [at] gmailcom> wrote:
> could you give more details about this "portal" feature?

A portal is an area defined by the user. This area is sampled in priority during
the shoot of rays. If a portal is put around a small light source, it will speed
up the evaluation of the direct lighting (for instance for sharp shadows). A
portal on a window helps the rays shooted from inside of a room to reach the
outside lights. A portal around a glass ball may help to build the caustic (but
in these case the results are not so good).

Hope it is clear.

Regards,
Fidos.

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