public Color FindCollision(HPoint a, HPoint b)
{
//figures
var sphere = new HPoint(0, 0, -3);
double radius = 1;
var plane = new HPoint[3]
{
new HPoint(1, -1, 1),
new HPoint(1, -1, -1),
new HPoint(-1, -1, 1)
};
//figures
//List<HPoint> collisions
//if (((b - a)*(sphere - a)).Length()/(a - b).Length() < radius)
// return Color.Black;
HPoint coll = HGeometry.OldIntersectPlaneLine(plane[0], plane[1], plane[2], a, b);
return(((int)Math.Round(coll.X) + (int)Math.Round(coll.Z)) % 2 == 0 ? Color.White : Color.Black);
}
public HFaceCollider(HPoint a, HPoint b, HPoint c, HShaders.Shader shader)
{
A = a;
B = b;
C = c;
Shader = shader;
}
public static bool IsPointOnRay(HPoint p, HRay ray)
{
if (!HAccuracy.DoubleEqual(0, ((p - ray.Source) * (ray.Direction)).Length())) //is not on line(colinear)
{
return(false);
}
return(HAccuracy.DoubleGreater((p - ray.Source) % (ray.Direction), 0)); //is codirectional
}
public static HPoint OldIntersectPlaneLine(HPoint p0, HPoint p1, HPoint p2, HPoint l0, HPoint l1)
{
Point3D tmp = EquationIntersectPlaneLine(
new Point3D(p0.X, p0.Y, p0.Z),
new Point3D(p1.X, p1.Y, p1.Z),
new Point3D(p2.X, p2.Y, p2.Z),
new Point3D(l0.X, l0.Y, l0.Z),
new Point3D(l1.X, l1.Y, l1.Z)
);
return(new HPoint(tmp.X, tmp.Y, tmp.Z));
}
public Color TraceRay(HRay ray)
{
var collisions = new List <KeyValuePair <HPoint, ICollider> >();
foreach (ICollider collider in Colliders)
{
HPoint collisionPoint = collider.CollisionPoint(ray);
if (collisionPoint != null)
{
collisions.Add(new KeyValuePair <HPoint, ICollider>(collisionPoint, collider));
}
}
collisions.Sort(
(KeyValuePair <HPoint, ICollider> a, KeyValuePair <HPoint, ICollider> b) =>
(ray.Source - a.Key).Length().CompareTo((ray.Source - b.Key).Length()));
return(collisions.Count == 0 ? Color.White : collisions[0].Value.ProcessCollision(this, collisions[0].Value, ray));
}
public HPoint CollisionPoint(HRay ray)
{
HPoint intersectionPoint = HGeometry.OldIntersectPlaneLine(A, B, C, ray.Source, ray.Source + ray.Direction);
if (intersectionPoint == null) //no intersection point with plane
{
return(null);
}
if (!HGeometry.IsPointOnRay(intersectionPoint, ray)) //point is invisible
{
return(null);
}
double firstSquare = HGeometry.TriangleSquare(A, B, C);
double secondSquare = HGeometry.TriangleSquare(A, B, intersectionPoint) +
HGeometry.TriangleSquare(A, C, intersectionPoint) +
HGeometry.TriangleSquare(C, B, intersectionPoint);
return(HAccuracy.DoubleEqual(firstSquare, secondSquare) ? intersectionPoint : null);
}
public Bitmap Visualize()
{
var bmp = new Bitmap(WidthIterations, HeightIterations);
for (int y = 0; y < HeightIterations; y++)
{
for (int x = 0; x < WidthIterations; x++)
{
var a = new HPoint(0, 0, 0);
var b = new HPoint(
ViewportWidth / WidthIterations * x - ViewportWidth / 2,
ViewportHeight / HeightIterations * y - ViewportHeight / 2,
-ViewportDistance);
bmp.SetPixel(x, HeightIterations - y - 1, TraceRay(new HRay(a, b)));
}
}
return(bmp);
}
public Bitmap Run(RichTextBox r)
{
var bmp = new Bitmap(WidthIterations, HeightIterations);
for (int y = 0; y < HeightIterations; y++)
{
for (int x = 0; x < WidthIterations; x++)
{
var a = new HPoint(0, 0, 0);
var b = new HPoint(
ViewportWidth / WidthIterations * x - ViewportWidth / 2,
ViewportHeight / HeightIterations * y - ViewportHeight / 2,
-ViewportDistance);
//r.AppendText(b.ToString() + '\n');
bmp.SetPixel(x, y, FindCollision(a, b));
}
}
return(bmp);
}
public void ProjectPointOnLine(HPoint l0, HPoint l1, HPoint toProject) //todo in process
{
HPoint planeNormal = (l1 - l0) * (toProject - l0);
HPoint lineNormal = planeNormal * (l1 - l0);
double l = TriangleSquare(l0, l1, toProject) / (l0 - l1).Length();
}
public static double TriangleSquare(HPoint a, HPoint b, HPoint c)
{
return(((b - a) * (c - a)).Length() / 2);
}
public static HPoint ReflectVector(HPoint vector, HPoint reflectionNormal) //todo in process
{
return(null);
}
public HSphereCollider(HPoint center, double radius)
{
Center = center;
Radius = radius;
}