57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
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#pragma once
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#include "rtweekend.h"
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#include "hittable.h"
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class material
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{
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public:
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virtual bool scatter(
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const ray& r_in,
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const hit_record& rec,
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colour& attenuation,
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ray& scattered) const = 0;
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};
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class lambertian : public material
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{
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public:
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lambertian(const colour& a) : albedo_(a) {}
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virtual bool scatter(
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const ray& r_in,
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const hit_record& rec,
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colour& attenuation,
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ray& scattered) const
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{
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vec3 scatter_direction = rec.normal + random_unit_vector();
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scattered = ray(rec.p, scatter_direction);
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attenuation = albedo_;
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return true;
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}
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private:
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colour albedo_;
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};
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class metal : public material
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{
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public:
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metal(const colour& a) : albedo_(a) {}
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virtual bool scatter(
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const ray& r_in,
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const hit_record& rec,
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colour& attenuation,
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ray& scattered) const
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{
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vec3 reflected = reflect(unit_vector(r_in.direction()), rec.normal);
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scattered = ray(rec.p, reflected);
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attenuation = albedo_;
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return dot(scattered.direction(), rec.normal) > 0;
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}
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private:
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colour albedo_;
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};
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