/// <summary>
/// This variant of the intersection method returns the affected
/// planes of the box if the box was hit.
/// </summary>
public bool Intersects(
Box3d box,
ref double tmin,
ref double tmax,
out Box.Flags tminFlags,
out Box.Flags tmaxFlags
)
{
var dirFlags = DirFlags;
tminFlags = Box.Flags.None;
tmaxFlags = Box.Flags.None;
if ((dirFlags & Vec.DirFlags.PositiveX) != 0)
{
{
double t = (box.Max.X - Ray.Origin.X) * InvDir.X;
if (t <= tmin)
{
return(false);
}
if (t < tmax)
{
tmax = t; tmaxFlags = Box.Flags.MaxX;
}
}
{
double t = (box.Min.X - Ray.Origin.X) * InvDir.X;
if (t >= tmax)
{
return(false);
}
if (t > tmin)
{
tmin = t; tminFlags = Box.Flags.MinX;
}
}
}
else if ((dirFlags & Vec.DirFlags.NegativeX) != 0)
{
{
double t = (box.Min.X - Ray.Origin.X) * InvDir.X;
if (t <= tmin)
{
return(false);
}
if (t < tmax)
{
tmax = t; tmaxFlags = Box.Flags.MinX;
}
}
{
double t = (box.Max.X - Ray.Origin.X) * InvDir.X;
if (t >= tmax)
{
return(false);
}
if (t > tmin)
{
tmin = t; tminFlags = Box.Flags.MaxX;
}
}
}
else // ray parallel to X-plane
{
if (Ray.Origin.X < box.Min.X || Ray.Origin.X > box.Max.X)
{
return(false);
}
}
if ((dirFlags & Vec.DirFlags.PositiveY) != 0)
{
{
double t = (box.Max.Y - Ray.Origin.Y) * InvDir.Y;
if (t <= tmin)
{
return(false);
}
if (t < tmax)
{
tmax = t; tmaxFlags = Box.Flags.MaxY;
}
}
{
double t = (box.Min.Y - Ray.Origin.Y) * InvDir.Y;
if (t >= tmax)
{
return(false);
}
if (t > tmin)
{
tmin = t; tminFlags = Box.Flags.MinY;
}
}
}
else if ((dirFlags & Vec.DirFlags.NegativeY) != 0)
{
{
double t = (box.Min.Y - Ray.Origin.Y) * InvDir.Y;
if (t <= tmin)
{
return(false);
}
if (t < tmax)
{
tmax = t; tmaxFlags = Box.Flags.MinY;
}
}
{
double t = (box.Max.Y - Ray.Origin.Y) * InvDir.Y;
if (t >= tmax)
{
return(false);
}
if (t > tmin)
{
tmin = t; tminFlags = Box.Flags.MaxY;
}
}
}
else // ray parallel to Y-plane
{
if (Ray.Origin.Y < box.Min.Y || Ray.Origin.Y > box.Max.Y)
{
return(false);
}
}
if ((dirFlags & Vec.DirFlags.PositiveZ) != 0)
{
{
double t = (box.Max.Z - Ray.Origin.Z) * InvDir.Z;
if (t <= tmin)
{
return(false);
}
if (t < tmax)
{
tmax = t; tmaxFlags = Box.Flags.MaxZ;
}
}
{
double t = (box.Min.Z - Ray.Origin.Z) * InvDir.Z;
if (t >= tmax)
{
return(false);
}
if (t > tmin)
{
tmin = t; tminFlags = Box.Flags.MinZ;
}
}
}
else if ((dirFlags & Vec.DirFlags.NegativeZ) != 0)
{
{
double t = (box.Min.Z - Ray.Origin.Z) * InvDir.Z;
if (t <= tmin)
{
return(false);
}
if (t < tmax)
{
tmax = t; tmaxFlags = Box.Flags.MinZ;
}
}
{
double t = (box.Max.Z - Ray.Origin.Z) * InvDir.Z;
if (t >= tmax)
{
return(false);
}
if (t > tmin)
{
tmin = t; tminFlags = Box.Flags.MaxZ;
}
}
}
else // ray parallel to Z-plane
{
if (Ray.Origin.Z < box.Min.Z || Ray.Origin.Z > box.Max.Z)
{
return(false);
}
}
if (tmin > tmax)
{
return(false);
}
return(true);
}
public static Sphere3d GetBoundingSphere3d(this Box3d box) => box.IsInvalid ? Sphere3d.Invalid : new Sphere3d(box.Center, 0.5 * box.Size.Length);
public Box3f(Box3d box)
{
Min = (V3f)box.Min;
Max = (V3f)box.Max;
}
public OrientedBox3d(Box3d box, Euclidean3d trafo)
{
Box = box;
Trafo = trafo;
}
public OrientedBox3d(Box3d box, Rot3d rot, V3d trans)
{
Box = box;
Trafo = new Euclidean3d(rot, trans);
}
public OrientedBox3d(Box3d box, Rot3d rot)
{
Box = box;
Trafo = new Euclidean3d(rot, V3d.Zero);
}
public static V3d UniformV3dFullClosed(this IRandomUniform rnd, Box3d box)
{
return(box.Lerp(rnd.UniformDoubleFullClosed(),
rnd.UniformDoubleFullClosed(),
rnd.UniformDoubleFullClosed()));
}
public static V3d UniformV3dOpen(this IRandomUniform rnd, Box3d box)
{
return(box.Lerp(rnd.UniformDoubleOpen(),
rnd.UniformDoubleOpen(),
rnd.UniformDoubleOpen()));
}
/// <summary>
/// Gets outline corner indices of a box as seen from given position (in counter-clockwise order).
/// Returns null if position is inside the box.
/// </summary>
public static int[] GetOutlineCornerIndicesCCW(this Box3d box, V3d fromPosition)
{
if (fromPosition.X < box.Min.X)
{ //-X
if (fromPosition.Y < box.Min.Y)
{ //-Y
if (fromPosition.Z < box.Min.Z)
{ // -X -Y -Z
return(new[] { 1, 5, 4, 6, 2, 3 });
}
else if (fromPosition.Z > box.Max.Z)
{ // -X -Y +Z
return(new[] { 0, 1, 5, 7, 6, 2 });
}
else
{ // -X -Y Z
return(new[] { 1, 5, 6, 2 });
}
}
else if (fromPosition.Y > box.Max.Y)
{ // +Y
if (fromPosition.Z < box.Min.Z)
{ // -X +Y -Z
return(new[] { 0, 4, 6, 7, 3, 1 });
}
else if (fromPosition.Z > box.Max.Z)
{ // -X +Y +Z
return(new[] { 0, 4, 5, 7, 3, 2 });
}
else
{ // -X +Y Z
return(new[] { 0, 4, 7, 3 });
}
}
else
{ // Y
if (fromPosition.Z < box.Min.Z)
{ // -X Y -Z
return(new[] { 1, 4, 6, 3 });
}
else if (fromPosition.Z > box.Max.Z)
{ // -X Y +Z
return(new[] { 0, 5, 7, 2 });
}
else
{ // -X Y Z
return(new[] { 0, 4, 6, 2 });
}
}
}
else if (fromPosition.X > box.Max.X)
{ // +X
if (fromPosition.Y < box.Min.Y)
{ //-Y
if (fromPosition.Z < box.Min.Z)
{ // +X -Y -Z
return(new[] { 0, 2, 3, 7, 5, 4 });
}
else if (fromPosition.Z > box.Max.Z)
{ // +X -Y +Z
return(new[] { 0, 1, 3, 7, 6, 4 });
}
else
{ // +X -Y Z
return(new[] { 0, 3, 7, 4 });
}
}
else if (fromPosition.Y > box.Max.Y)
{ // +Y
if (fromPosition.Z < box.Min.Z)
{ // +X +Y -Z
return(new[] { 0, 2, 6, 7, 5, 1 });
}
else if (fromPosition.Z > box.Max.Z)
{ // +X +Y +Z
return(new[] { 1, 3, 2, 6, 4, 5 });
}
else
{ // +X +Y Z
return(new[] { 1, 2, 6, 5 });
}
}
else
{ // Y
if (fromPosition.Z < box.Min.Z)
{ // +X Y -Z
return(new[] { 0, 2, 7, 5 });
}
else if (fromPosition.Z > box.Max.Z)
{ // +X Y +Z
return(new[] { 1, 3, 6, 4 });
}
else
{ // +X Y Z
return(new[] { 1, 3, 7, 5 });
}
}
}
else
{ // X
if (fromPosition.Y < box.Min.Y)
{ //-Y
if (fromPosition.Z < box.Min.Z)
{ // X -Y -Z
return(new[] { 2, 3, 5, 4 });
}
else if (fromPosition.Z > box.Max.Z)
{ // X -Y +Z
return(new[] { 0, 1, 7, 6 });
}
else
{ // X -Y Z
return(new[] { 0, 1, 5, 4 });
}
}
else if (fromPosition.Y > box.Max.Y)
{ // +Y
if (fromPosition.Z < box.Min.Z)
{ // X +Y -Z
return(new[] { 0, 6, 7, 1 });
}
else if (fromPosition.Z > box.Max.Z)
{ // X +Y +Z
return(new[] { 2, 4, 5, 3 });
}
else
{ // X +Y Z
return(new[] { 2, 6, 7, 3 });
}
}
else
{ // Y
if (fromPosition.Z < box.Min.Z)
{ // X Y -Z
return(new[] { 0, 2, 3, 1 });
}
else if (fromPosition.Z > box.Max.Z)
{ // X Y +Z
return(new[] { 4, 5, 7, 6 });
}
else
{ // X Y Z
return(null);
}
}
}
}
/// <summary>
/// Gets outline corners of a box as seen from given position (in clockwise order).
/// Returns null if position is inside the box.
/// </summary>
public static V3d[] GetOutlineCornersCW(this Box3d box, V3d fromPosition)
{
var cs = box.ComputeCorners();
return(GetOutlineCornerIndicesCW(box, fromPosition)?.Map(i => cs[i]));
}
