private bool CheckSphereAndSphere(HitableSphere sphereA, HitableSphere sphereB)
{
var deltaX = sphereA.Point.x - sphereB.Point.x;
var deltaY = sphereA.Point.y - sphereB.Point.y;
var disSqrt = deltaX * deltaX + deltaY * deltaY;
var radiusSum = sphereA.Radius + sphereB.Radius;
return(disSqrt <= (radiusSum * radiusSum));
}
private bool CheckCapsuleAndSphere(HitableCapsule capsule, HitableSphere sphere)
{
var dx = sphere.Point.x - capsule.Point.x;
var dy = sphere.Point.y - capsule.Point.y;
var t = (capsule.Vec.x * dx + capsule.Vec.y * dy) /
(capsule.Vec.x * capsule.Vec.x + capsule.Vec.y * capsule.Vec.y);
t = Mathf.Clamp01(t);
var mx = capsule.Vec.x * t + capsule.Point.x;
var my = capsule.Vec.y * t + capsule.Point.y;
var disSqrt = (mx - sphere.Point.x) * (mx - sphere.Point.x) +
(my - sphere.Point.y) * (my - sphere.Point.y);
var radiusSum = capsule.Radius + sphere.Radius;
if (disSqrt <= radiusSum * radiusSum)
{
return(true);
}
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);
}
