From 52d11df35ca9846085b910e2e40434b48847d9d8 Mon Sep 17 00:00:00 2001 From: Keuin Date: Sat, 16 Apr 2022 15:22:40 +0800 Subject: Add dielectric reflectiveness (using Schlick's Approximation). --- material_dielectric.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'material_dielectric.h') diff --git a/material_dielectric.h b/material_dielectric.h index 48382b4..46b17da 100644 --- a/material_dielectric.h +++ b/material_dielectric.h @@ -10,8 +10,19 @@ class material_dielectric : public material { double ri_inv; + + static double reflectance(double cosine, double ref_idx) { + assert(cosine > 0); + assert(ref_idx > 0); + // Use Schlick's approximation for reflectance. + auto r0 = (1 - ref_idx) / (1 + ref_idx); + r0 = r0 * r0; + return r0 + (1 - r0) * pow((1 - cosine), 5); + } + public: explicit material_dielectric(double ri) : ri_inv{1.0 / ri} {} + bool scatter(ray3d &r, const object &hit_obj, double hit_t, random_uv_gen_3d &ruvg) const override; }; -- cgit v1.2.3