Le 03/12/2012 17:00, Encore nous fit lire :
> 
>> With orthographic, the cut should be something like a box (sides aligned
>> with the camera)
> 
> Currently, there is a code block which handles the planes that cause the cut to
> make the back post invisible.
> 
> To achieve this, two planes are created like this:
> 
> #declare Plane1 = plane {-x, 0 rotate y * Alpha};
> #declare Plane2 = plane { x, 0 rotate y *-Alpha};
> 
> Where Alpha is the distance from the camera position to the vertical post that
> needs to be visible. This is done by the following:
> 
> #local r = R;
> #local Alpha = asin(r / ViewVector) * 180 / pi;
> 

Well, instead of rotating your plane, translate it.
something along:
#declare Plane1 = plane { -x, 0 translate r*x }; // and so on

now, I wonder if it should be asin or atan ? (given that r is probably
small when compared to ViewVector, that might be irrelevant)
Or maybe I do not understand R, r & ViewVector.

Alpha is not a distance, it's an angle.

> This makes the conical shape from the cube to the camera.
> Since I now use the orthographic camera, I need to change this setting by making
> the two planes simply parallel to each other and fixed to the ViewVector for
> animation purposes.
> What should I do to solve this problem?
> 
> I am also attaching a screenshot of what the scene looks like with the
> orthographic camera and the default angle.
>

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