Add line intersection tests in WorldViewer

zzre.core/math/IntersectionQueries.Mixin.cs

@@ -23,7 +23,7 @@ partial class IntersectionQueries
         { a: Sphere A, b: Sphere B } => Intersects(A, B),
         { a: Sphere A, b: Plane B } => Intersects(A, B),
         { a: Plane A, b: Plane B } => Intersects(A, B),
-        { a: IRaycastable raycastable, b: Line line } => raycastable.Cast(line).HasValue,
+        { a: IRaycastable raycastable, b: Line line } => a.Intersects(line.Start) || raycastable.Cast(line).HasValue,
         _ when shouldTryToSwitch => Intersects(b, a, false),
         _ => throw new ArgumentException($"Intersection between {a.GetType().Name} and {b.GetType().Name} is missing")
     };

zzre.core/math/Line.cs

@@ -25,15 +25,4 @@ namespace zzre;
     public Raycast? Cast(OrientedBox box) => CheckRaycast(new Ray(Start, Direction).Cast(box));
     public Raycast? Cast(Plane plane) => CheckRaycast(new Ray(Start, Direction).Cast(plane));
     public Raycast? Cast(Triangle triangle) => CheckRaycast(new Ray(Start, Direction).Cast(triangle));
-
-    public bool Intersects(Box box) => Cast(box) != null;
-    public bool Intersects(OrientedBox box) => Cast(box) != null;
-    public bool Intersects(Sphere sphere) => Cast(sphere) != null;
-    public bool Intersects(Plane plane) => Cast(plane) != null;
-    public bool Intersects(Triangle triangle) => Cast(triangle) != null;
-
-    // Line-Line intersections in 3D are super rare and are not necessary for zzio.
-    // This will be a fun surprise for anyone actually rellying on this and taking
-    // zzio math without looking into what it actually can and cannot do.
-    public bool Intersects(Line line) => false;
 }

zzre/tools/WorldViewer.cs

@@ -25,7 +25,8 @@ private enum IntersectionPrimitive
         Box,
         OrientedBox,
         Sphere,
-        Triangle
+        Triangle,
+        Line
     }
 
     private const byte DebugPlaneAlpha = 0xA0;
@@ -580,6 +581,13 @@ private void UpdateIntersectionPrimitive()
                 edges = triangle.Edges();
                 break;
 
+            case IntersectionPrimitive.Line:
+                var pos = camera.Location.GlobalPosition;
+                var line = new Line(pos, pos - camera.Location.GlobalForward * intersectionSize);
+                intersections = worldCollider.Intersections(line);
+                edges = new[] { line };
+                break;
+
             default: return;
         }