#ifndef jbt_csg_h
#define jbt_csg_h

#include "compound.h"


class jbt_csg : public jbt_compound
{
protected:
    
    jbt_csg();
    
 
    jbt_blobtree* contrib();
    
    void beginQuery( const jVec3& );


    virtual bool contrib( jFlt fv, jFlt cfv ) const = 0;


    virtual jFlt rightField( jFlt f ) const { return f; }    


    virtual bool spanCSG( const jVec3&, const jVec3& b );

    void field( jFlt& );
    void normal( jNorm3& );
    void attribute( jbt_attribute* );
    void attributes( jbt_diffuse*, jbt_specular*, 
                     jbt_scalar*, jbt_scalar*, jbt_scalar* );

    void bracket( const jRay&, jbt_brackets& );
    void uv( jVec2&, jbt_blobtree*, const jMat4& );

    jNorm3 repulse();


    enum Child { left, right } child;

private:
    

    jgl_algebraic* expression( const jMat4& ) const;

    jbt_blobtree* c;
};

#endif