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fuzzy metal
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-5
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src/main.zig
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src/main.zig
···
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// Setting up the world
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var material_ground = Material.lambertian(zm.f32x4(0.8, 0.8, 0.0, 1.0));
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var material_center = Material.lambertian(zm.f32x4(0.7, 0.3, 0.3, 1.0));
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var material_left = Material.metal(zm.f32x4(0.8, 0.8, 0.8, 1.0));
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var material_right = Material.metal(zm.f32x4(0.8, 0.6, 0.2, 1.0));
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var material_left = Material.metal(zm.f32x4(0.8, 0.8, 0.8, 1.0), 0.3);
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var material_right = Material.metal(zm.f32x4(0.8, 0.6, 0.2, 1.0), 1.0);
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var world = HittableList.init(allocator);
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try world.add(Hittable.initSphere(Sphere{ .center = zm.f32x4(0, -100.5, -1, 0), .radius = 100, .mat = &material_ground }));
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-3
src/material.zig
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src/material.zig
···
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return .{ .lambertian = .{ .albedo = albedo } };
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}
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pub fn metal(albedo: zm.Vec) Material {
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return .{ .metal = .{ .albedo = albedo } };
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pub fn metal(albedo: zm.Vec, fuzz: f32) Material {
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return .{ .metal = .{ .albedo = albedo, .fuzz = if (fuzz < 1) fuzz else 1.0 } };
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}
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pub fn scatter(self: *Material, r: *Ray, rec: *hittable.HitRecord, attenuation: *zm.Vec) ?Ray {
···
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pub const Metal = struct {
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albedo: zm.Vec,
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/// fuzz < 1
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fuzz: f32,
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pub fn scatter(self: *Metal, r: *Ray, rec: *hittable.HitRecord, attenuation: *zm.Vec) ?Ray {
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const reflected = util.reflect(zm.normalize3(r.dir), rec.normal);
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const scattered = Ray.init(rec.p, reflected + zm.f32x4s(self.fuzz) * util.randomUnitVec());
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attenuation.* = self.albedo;
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return Ray.init(rec.p, reflected);
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return if (zm.dot3(scattered.dir, rec.normal)[0] > 0) scattered else null;
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}
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};