示例#1
0
        public IntersectionResult Intersect(Ray r)
        {
            Vector3 p2p1 = p2 - p1;
              Vector3 p3p1 = p3 - p1;
              Vector3 triNormal = Vector3.Cross(p2p1, p3p1);
              triNormal.Normalize();
              float dot = Vector3.Dot(r.Direction, triNormal);
              if (Calc.AlmostZero(dot))
            return IntersectionResult.NoIntersection;
              else
              {
            float d = Vector3.Dot(triNormal, p1);
            float np4 = Vector3.Dot(triNormal, r.Origin);
            float nv = Vector3.Dot(triNormal, r.Direction);
            float t = (d - np4) / nv;

            Vector3 q = r.Origin + r.Direction * t;

            float a = Vector3.Dot(Vector3.Cross(p2p1, q - p1), triNormal);
            float b = Vector3.Dot(Vector3.Cross(p3 - p2, q - p2), triNormal);
            float c = Vector3.Dot(Vector3.Cross(p1 - p3, q - p3), triNormal);
            if (a >= 0 && b >= 0 && c >= 0)
              return IntersectionResult.Interects(t);
            else
              return IntersectionResult.NoIntersection;
              }
        }
示例#2
0
 private void button1_Click(object sender, EventArgs e)
 {
     using (Graphics g = CreateGraphics())
       {
     Triangle tri = new Triangle(v(0, 0, 0), v(100, 0, 0), v(0, 100, 0));
     for(int x=0; x<Width; x++)
       for (int y = 0; y < Height; y++)
       {
     Ray r = new Ray(v(x, y, 100), v(0, 0, -1));
     if (tri.Intersect(r).DoesIntersect)
       g.FillRectangle(new SolidBrush(Color.Red), new Rectangle(x, y, 1, 1));
       }
       }
 }
示例#3
0
        public static void SelfTest(ITestToolkit tk)
        {
            Triangle t = new Triangle(Vector3.UnitX, Vector3.UnitY, Vector3.UnitZ);
              Ray r = new Ray(new Vector3(0.1f, 0.1f, 3), new Vector3(0, 0, -1));
              IntersectionResult result = t.Intersect(r);
              tk.Assert(result.DoesIntersect);

              t = new Triangle(Vector3.Zero, Vector3.UnitX, Vector3.UnitY);
              r = new Ray(new Vector3(0.1f, 0.1f, 3), -Vector3.UnitZ);
              result = t.Intersect(r);
              tk.AssertEqual(3, result.Param);

              r = new Ray(new Vector3(-1, 0, 3), -Vector3.UnitZ);
              result = t.Intersect(r);
              tk.Assert(!result.DoesIntersect);
        }
示例#4
0
 public static void SelfTest(ITestToolkit tk)
 {
     Ray r = new Ray(Vector3.UnitX, Vector3.UnitX);
       Vector3 origin = r.Origin;
       Vector3 dir = r.Direction;
 }