| 1 |
using System; |
| 2 |
|
| 3 |
namespace Oni |
| 4 |
{ |
| 5 |
internal struct Plane : IEquatable<Plane> |
| 6 |
{ |
| 7 |
public Vector3 Normal; |
| 8 |
public float D; |
| 9 |
|
| 10 |
public Plane(Vector3 normal, float d) |
| 11 |
{ |
| 12 |
Normal = normal; |
| 13 |
D = d; |
| 14 |
} |
| 15 |
|
| 16 |
public Plane(Vector3 point1, Vector3 point2, Vector3 point3) |
| 17 |
{ |
| 18 |
Normal = Vector3.Normalize(Vector3.Cross(point2 - point1, point3 - point1)); |
| 19 |
D = -Vector3.Dot(Normal, point1); |
| 20 |
} |
| 21 |
|
| 22 |
public float DotCoordinate(Vector3 point) => Vector3.Dot(Normal, point) + D; |
| 23 |
|
| 24 |
public float DotNormal(Vector3 value) => Vector3.Dot(Normal, value); |
| 25 |
|
| 26 |
public void Flip() |
| 27 |
{ |
| 28 |
Normal = -Normal; |
| 29 |
D = -D; |
| 30 |
} |
| 31 |
|
| 32 |
public static Plane Flip(Plane plane) |
| 33 |
{ |
| 34 |
plane.Normal = -plane.Normal; |
| 35 |
plane.D = -plane.D; |
| 36 |
|
| 37 |
return plane; |
| 38 |
} |
| 39 |
|
| 40 |
public static bool operator ==(Plane p1, Plane p2) => p1.D == p2.D && p1.Normal == p2.Normal; |
| 41 |
public static bool operator !=(Plane p1, Plane p2) => p1.D != p2.D || p1.Normal != p2.Normal; |
| 42 |
|
| 43 |
public bool Equals(Plane other) => other.D == D && other.Normal == Normal; |
| 44 |
|
| 45 |
public override bool Equals(object obj) => obj is Plane && Equals((Plane)obj); |
| 46 |
public override int GetHashCode() => Normal.GetHashCode() ^ D.GetHashCode(); |
| 47 |
|
| 48 |
public override string ToString() => $"{{Normal:{Normal} D:{D}}}"; |
| 49 |
|
| 50 |
public int Intersects(BoundingBox box) |
| 51 |
{ |
| 52 |
Vector3 max, min; |
| 53 |
|
| 54 |
if (Normal.X >= 0.0f) |
| 55 |
{ |
| 56 |
min.X = box.Min.X; |
| 57 |
max.X = box.Max.X; |
| 58 |
} |
| 59 |
else |
| 60 |
{ |
| 61 |
min.X = box.Max.X; |
| 62 |
max.X = box.Min.X; |
| 63 |
} |
| 64 |
|
| 65 |
if (Normal.Y >= 0.0f) |
| 66 |
{ |
| 67 |
min.Y = box.Min.Y; |
| 68 |
max.Y = box.Max.Y; |
| 69 |
} |
| 70 |
else |
| 71 |
{ |
| 72 |
min.Y = box.Max.Y; |
| 73 |
max.Y = box.Min.Y; |
| 74 |
} |
| 75 |
|
| 76 |
if (Normal.Z >= 0.0f) |
| 77 |
{ |
| 78 |
min.Z = box.Min.Z; |
| 79 |
max.Z = box.Max.Z; |
| 80 |
} |
| 81 |
else |
| 82 |
{ |
| 83 |
min.Z = box.Max.Z; |
| 84 |
max.Z = box.Min.Z; |
| 85 |
} |
| 86 |
|
| 87 |
if (Vector3.Dot(Normal, min) + D > 0.0f) |
| 88 |
return 1; |
| 89 |
else if (Vector3.Dot(Normal, max) + D < 0.0f) |
| 90 |
return -1; |
| 91 |
else |
| 92 |
return 0; |
| 93 |
} |
| 94 |
} |
| 95 |
} |
