private bool CheckCubeAndCube(HitableCube a, HitableCube b)
{
if (a.Right >= b.Left && a.Left <= b.Right)
{
if (a.Bottom <= b.Top && a.Top >= b.Bottom)
{
return(true);
}
}
return(false);
}
private void InnerCheckCubes(HitableCube cube, Quadtree quadtree)
{
if (quadtree == null)
{
return;
}
foreach (var hitable in quadtree.Hitables)
{
// CheckCollision
}
InnerCheckCubes(cube, quadtree.LeftTop);
InnerCheckCubes(cube, quadtree.RightTop);
InnerCheckCubes(cube, quadtree.LeftBottom);
InnerCheckCubes(cube, quadtree.RightBottom);
}
private bool CheckCapsuleAndCube(HitableCapsule capsule, HitableCube cube)
{
return(false);
}
private bool CheckSphereAndCube(HitableSphere sphere, HitableCube cube)
{
// 圆心在长方形很外面
if ((sphere.Point.x < cube.Left - sphere.Radius) ||
(sphere.Point.x > cube.Right + sphere.Radius) ||
(sphere.Point.y > cube.Top + sphere.Radius) ||
(sphere.Point.y < cube.Bottom - sphere.Radius)
)
{
return(false);
}
var result = true;
var radiusSqrt = sphere.Radius * sphere.Radius;
if (sphere.Point.x < cube.Left)
{
// 左上角
if (sphere.Point.y > cube.Top)
{
var deltaX = sphere.Point.x - cube.Left;
var deltaY = sphere.Point.y - cube.Top;
var disSqrt = deltaX * deltaX + deltaY * deltaY;
if (radiusSqrt < disSqrt)
{
result = false;
}
}
// 左下角
else if (sphere.Point.y < cube.Bottom)
{
var deltaX = sphere.Point.x - cube.Left;
var deltaY = sphere.Point.y - cube.Bottom;
var disSqrt = deltaX * deltaX + deltaY * deltaY;
if (radiusSqrt < disSqrt)
{
result = false;
}
}
}
else if (sphere.Point.x > cube.Right)
{
// 右上角
if (sphere.Point.y > cube.Top)
{
var deltaX = sphere.Point.x - cube.Right;
var deltaY = sphere.Point.y - cube.Top;
var disSqrt = deltaX * deltaX + deltaY * deltaY;
if (radiusSqrt < disSqrt)
{
result = false;
}
}
// 右下角
else if (sphere.Point.y < cube.Bottom)
{
var deltaX = sphere.Point.x - cube.Right;
var deltaY = sphere.Point.y - cube.Bottom;
var disSqrt = deltaX * deltaX + deltaY * deltaY;
if (radiusSqrt < disSqrt)
{
result = false;
}
}
}
return(result);
}
