[metapost] metafun: transparency (opacity) that doesn't add up

[Stephan Hennig]

Mojca Miklavec schrieb:
> On 4/25/06, Stephan Hennig wrote:
>>
>> Is there any way to draw a uniformly colored transparent grid with
>> MetaFun?
>
> Draw a single closed curve instead:
>
> For two separate curves you'll always get colors adding up to opacity.

Thanks! This perfectly solves the issue. Could you please give me a
pointer to some document describing that fact?

Regards,
Stephan Hennig