On 24 December 2013 21:01, Ronie Salgado <roniesalg@gmail.com> wrote:

Hi Denis,

The shape color is not enough to know about its transparency, because it could have a texture with partially transparent elements. Despite that, there's another kind of transparency, fully opaque or fully transparent, which doesn't require special rendering. That other kind of transparency is supported by the multi-pass lighting models.

... and there are many different techniques for rendering scenes with semi-transparent objects,

including ray-tracing. Some solutions are simple some are complex, and require significant efforts for implementing them, like properly organizing/adjusting data structures and rendering pipeline.

So, answering question if it 'can be automatic', - yes, if someone will implement it. OpenGL out-of-the-box, don't have such automagic.

Greetings
Ronie Salgado

2013/12/24 Denis Kudriashov <dionisiydk@gmail.com>

Hi

2013/12/24 Alexandre Bergel <alexandre.bergel@me.com>

el1 := (R3CubeShape new color: (Color purple alpha: 0.2)) element.
el2 := (R3CubeShape new color: (Color purple alpha: 0.2)) element.

el1 makeTranslucent.

Can it be automatic? Element has color which know about its transparency

--
Best regards,
Igor Stasenko.