Thanks for your replay, Manuel.

However, I am not sure if I understood your points right, let me repeat the 
way I understood. So you can correct me.

"When selecting with a rectangle, POV-Ray is currently remembering the 
outlines and can therefore repeat a render just like that. However when 
using a lasso shape (irregular shape) with more corners than a rectangle, 
POV-Ray could not automatically re-render that selection.

And it is not possible to select (based on what you see so far after a 
rendering) to select a part of the scene so exactly as you could with a 
rectange."

Is this what you meant?

Sven




"Mike Williams" <nos### [at] econymdemoncouk> schrieb im Newsbeitrag 
news:Qq3### [at] econymdemoncouk...
> Wasn't it Sven Littkowski who wrote:
>>Hi Chambers and Alain,
>>
>>I am also a programmer and when suggesting the new lasso feature, I had
>>exactly in mind what Chambers explains.
>>
>>But on the other side, I am not sure how and how much it affects the 
>>speed.
>>
>>I would like to have here an opinion by someone from the POV-Ray team, as
>>they know the source code the best, and can also very fine estimate how 
>>the
>>new lasso would affect calculation amount and speed.
>
> One awkwardness might be the difficulty of doing a shift-lasso to
> remember a permanent region.
>
> With the existing shift-drag rectangle, only four parameters need to be
> appended to the command line, but an arbitrary shape might require a
> very large number of parameters.
>
> Without the ability to set the lassoed region permanently, you'd have to
> re-lasso the area after each test run, even if the last test failed so
> badly that nothing was visible in the target region.
>
> -- 
> Mike Williams
> Gentleman of Leisure

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