src/TransparentShader.h

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#ifndef FLATSHADERTRANSPARENT_H
#define FLATSHADERTRANSPARENT_H


#include "Shader.h"
#include "Vec3f.h"
#include "Ray.h"
#include "Scene.h"
#include "defines.h"


class TransparentShader : public Shader
{
public:
    TransparentShader(  Scene *     scene,
                        RGBAColor   color = RGBAColor(1.0, 1.0, 1.0))
        : Shader(scene),
            mColor(color)
    {
    }

    RGBAColor shade(const Ray & ray) const
    {
        // look behind this object, no need to transform coordinates
        Ray newray = ray;
        newray.init(ray.hitPoint(EPSILON), ray.dir());
        newray.updateInfluence(ray); // FIXME consider alpha channel of color
        return RGBAColor(lerp(mScene->rayTrace(newray).rgb(), mColor.rgb(), mColor.a()));
    }

private:
    RGBAColor mColor;
};

#endif

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