public static Boundary SurroundingBoundary(Boundary a, Boundary b)
{
var boundary = new Boundary();
boundary.box = Aabb.SurroundingBox(a.box, b.box);
return(boundary);
}
public MovingSphere(Vector3 center0, Vector3 center1, float t0, float t1, float r, MaterialData material) : base(center0, r, material)
{
center1_ = center1;
time0_ = t0;
time1_ = t1;
boundary_.box = Aabb.SurroundingBox(boundary_.box, CreateAabb(center1_, radius_));
}
public bool BoundingBox(double t0, double t1, out Aabb outputBox)
{
var firstBox = true;
outputBox = default(Aabb);
foreach (var obj in Objects)
{
if (!obj.BoundingBox(t0, t1, out var output))
{
return(false);
}
outputBox = firstBox ? output : Aabb.SurroundingBox(outputBox, output);
firstBox = false;
}
return(true);
}
public bool BoundingBox(double t0, double t1, out Aabb outputBox)
{
var c0 = CenterForTime(t0);
var c1 = CenterForTime(t1);
var b0 = new Aabb
{
Min = c0 - new Vec3(Radius, Radius, Radius),
Max = c0 + new Vec3(Radius, Radius, Radius),
};
var b1 = new Aabb
{
Min = c1 - new Vec3(Radius, Radius, Radius),
Max = c1 + new Vec3(Radius, Radius, Radius),
};
outputBox = Aabb.SurroundingBox(b0, b1);
return(true);
}
public BvhNode(List <IHittable> srcObjects, int start, int end, double t0, double t1)
{
var min = new Vec3(MathUtils.Infinity, MathUtils.Infinity, MathUtils.Infinity);
var max = new Vec3(-MathUtils.Infinity, -MathUtils.Infinity, -MathUtils.Infinity);
for (var i = start; i < end; i++)
{
srcObjects[i].BoundingBox(t0, t1, out var box);
if (box.Min.x < min.x)
{
min.x = box.Min.x;
}
if (box.Min.y < min.y)
{
min.y = box.Min.y;
}
if (box.Min.z < min.z)
{
min.z = box.Min.z;
}
if (box.Max.x > max.x)
{
max.x = box.Max.x;
}
if (box.Max.y > max.y)
{
max.y = box.Max.y;
}
if (box.Max.z > max.z)
{
max.z = box.Max.z;
}
}
var diffs = max - min;
var axis = 0;
if (diffs.y > diffs.x && diffs.y > diffs.z)
{
axis = 1;
}
if (diffs.z > diffs.x && diffs.z > diffs.y)
{
axis = 2;
}
IComparer <IHittable> comparator;
switch (axis)
{
case 0: comparator = new BoxCompareX(); break;
case 1: comparator = new BoxCompareY(); break;
default: comparator = new BoxCompareZ(); break;
}
var objSpan = end - start;
if (objSpan == 1)
{
Left = srcObjects[start];
Right = srcObjects[start];
}
else if (objSpan == 2)
{
if (comparator.Compare(srcObjects[start], srcObjects[start + 1]) < 0)
{
Left = srcObjects[start];
Right = srcObjects[start + 1];
}
else
{
Left = srcObjects[start + 1];
Right = srcObjects[start];
}
}
else
{
srcObjects.Sort(start, objSpan, comparator);
var mid = start + objSpan / 2;
Left = new BvhNode(srcObjects, start, mid, t0, t1);
Right = new BvhNode(srcObjects, mid, end, t0, t1);
}
if (!Left.BoundingBox(t0, t1, out var boxLeft) ||
!Right.BoundingBox(t0, t1, out var boxRight))
{
throw new Exception("No bounding box in BvhNode constructor");
}
Box = Aabb.SurroundingBox(boxLeft, boxRight);
}