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Disk.cs
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Disk.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace randomImage
{
class Disk : Shape // inheritating shape class where the center of the disk is related to the position of the shape class
{
public Vector normal; // this is the normal of the plane containing the disk
public double radius; // radius of the disk
public Disk(Vector normal, Vector position, double radius, Material material) : base(position, material)
{
this.normal = normal;
this.radius = radius;
}
// creating a function to check whether the ray intersect the plane or not containing disk on it
double DoesIntersectDiskPlane(Vector origin, Vector direction)
{
Plane diskPlane = new Plane(normal, position, material); // checking whether the ray intersect the plane containing the disk
return diskPlane.DoesIntersect(origin, direction);
}
// knowing whether the ray intersect the disk or not
public override double DoesIntersect(Vector origin, Vector direction)
{
double t = DoesIntersectDiskPlane(origin, direction);
if (t > 0) // at first let's find whether the ray intersect the plane or not
{ // if so then
Vector p = origin + direction * t; // point of intersection in the plane
Vector q = p - position; // position vector from point to center of the disk
double d = q.Magnitude(); // magnitude of the vector which gives the distance inside the disk
if (d > radius)
{
t = -1;
}
}
return t;
}
// getting normal of a disk
public override Vector NormalAtPoint(Vector point)
{
return this.normal;
}
}
}