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 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);
}