CloudShader.h

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#ifndef CLOUDSHADER_H
#define CLOUDSHADER_H CLOUDSHADER_H

#include "Shader.h"
#include "PerlinNoise3D.h"
 
class CloudShader : public Shader
{
private:
    ColorRGBA color;

    PerlinNoise3D pnoise;

public:
    
    CloudShader(Scene *scene,
            ColorRGBA color = ColorRGBA (0.08,0.15,0.27))
    : Shader(scene),color(color)
    {};
    
    ColorRGBA Shade(Ray &ray)
    {
        Vector3D pos = ray.org + ray.t * ray.dir;
        PAIR uv = ray.hit->GetUV(ray);

        // fBM
        float total = 0.0f;
        float persistence = 0.7f;
        float amplitude = persistence;
        float freq = 0.01;
        float x = pos.x() * 10;
        float y = pos.y() * 10;
        float z = (pos.z() + scene->timer.GetTime() * 0.01) * 10;
        for (int i = 0; i < 8; i++) {
            total += amplitude * pnoise.noise(x*freq, y*freq, z*freq);
            freq *= 2;
            amplitude *= persistence;
        }

        if (total < 0) total = 0;
        if (total > 1) total = 1;
    
        return (color + ColorRGBA(total)).interpolated(ColorRGBA(.9,.9,1),pow(1-uv.second-0.5,12));
    };
};

#endif

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