src/CloudShader.h

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#ifndef CLOUDSHADER_H
#define CLOUDSHADER_H


#include "ProceduralShader.h"
#include "Primitive.h"


class CloudShader : public ProceduralShader
{
public:
    CloudShader(Scene *             scene,
                const RGBAColor &   color)
        : ProceduralShader(scene, 0.65f, 0.015f, 8),  /* some magic numbers which makes nice cloud effects */
            mColor(color)
    {
    }

    RGBAColor shade(const Ray & ray) const
    {
        TexCoordinate uv = ray.hit()->texCoord(ray);
        uv.setY(std::min(std::max(uv.y(), 0.0f), 1.0f));
        float noise = mPerlin.perlinNoise(uv.x()*1000, (uv.y()+0.66f)*1000)-0.2f;   // *magic*
        
        RGBAColor res = mColor;
        if (noise > 0.0)
            res += RGBAColor(noise * 5);
        
        // athmospheric scattering
        res += RGBAColor(powf(1.0 - uv.y(), 12)*0.85f);
        
        return res;
  }

private:
    RGBAColor mColor; 
};

#endif

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