Looks a little similar to OpenGL. Something like "begin(kCamera)" would 
be more compact and get rid of the repetitive "xxx(); begin();" pattern. 
You would of course put it in its own namespace to avoid name conflicts.

I don't really see the point of this approach though, it doesn't take 
advantage of any C++ features. The only advantage I see is that it could 
probably be mostly automatically generated. How about something more 
like:

begin("camera");
key("look_at"); vecval(2, 3, 2);
key("angle"); vecval(135);
end();

or:
//the constructor pushes the camera onto a stack of things being
//constructed
Camera cam1();
key("look_at"); vecval(2, 3, 2);
key("angle"); vecval(135);
Close();//Pops the camera off the construction stack

SetCamera(cam1);

I wouldn't like using either of these though, I personally would do 
something like:

Scene scene;

scene.SetCamera(PerspectiveCamera);
scene.GetCamera().SetLookAt(vec(2, 3, 2));
scene.GetCamera().SetAngle(135);

Material boxMat;
boxMat.SetPigment(SolidPigment(0.8));
boxMat.GetFinish().SetReflection(0.3);

scene.AddShape(Box(-1, 9, boxMat));

scene.OGLPreview();
outfile << scene;

This is similar to what I'm doing for the CSDL/Sapphire POV library, 
though things are a little different with a prototype-based OOL. 
Sapphire is slower than C++ because it is interpreted, but faster and 
more flexible than POV-Script. It will look more like:

delegate load POV: "povray.csdl";

function run() {
    .camera.SetLookAt(< 2, 3, 2>);
    .camera.SetAngle(135);
    
    //make() is a method of the POV-Ray library object that
    //clones a shape object and adds the clone to the scene,
    //and returns the clone.
    .make(.Box) {
        pta = -1;
        ptb = 9;
        material {
            clone pigment: SolidPigment {color = 0.8};
            finish.SetReflection(0.3);
        };
    };

    clone fout: stream;
    fout.open("outputfile.pov");
    fout.write(POV);
};

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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