48 lines
1.5 KiB
C#
Executable File
48 lines
1.5 KiB
C#
Executable File
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace RaytracerEngine
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{
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public class sphere : hitable
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{
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vec3 center;
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float radius;
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public sphere() { }
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public sphere(vec3 cen, float r) { center = cen; radius = r; }
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public override bool hit(ray r, float t_min, float t_max, out hit_record rec)
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{
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vec3 oc = r.origin - center;
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float a = vec3.dot(r.direction, r.direction);
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float b = vec3.dot(oc, r.direction);
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float c = vec3.dot(oc, oc) - radius * radius;
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float discriminant = b * b - a * c;
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if (discriminant > 0)
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{
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float temp = (float)((-b - Math.Sqrt(discriminant)) / a);
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if (temp < t_max && temp > t_min)
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{
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rec.t = temp;
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rec.p = r.pap(rec.t);
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rec.normal = (rec.p - center) / radius;
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return true;
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}
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temp = (float)((-b + Math.Sqrt(discriminant)) / a);
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if (temp < t_max && temp > t_min)
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{
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rec.t = temp;
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rec.p = r.pap(rec.t);
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rec.normal = (rec.p - center) / radius;
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return true;
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}
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}
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rec = new hit_record();
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return false;
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}
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}
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}
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