Fix tracing support

sources/Gameplay/BaseClasses/Frontend/World/TracingIterator.uc

@@ -20,6 +20,20 @@
 class TracingIterator extends Iter
     abstract;
 
+/**
+ *  Returns position from which tracing is started.
+ *
+ *  @return Position from which stracing has started.
+ */
+public function Vector GetTracingStart();
+
+/**
+ *  Returns position at which tracing has ended.
+ *
+ *  @return Position at which tracing has ended.
+ */
+public function Vector GetTracingEnd();
+
 /**
  *  Returns only `EPlaceable` interfaces for traced entities.
  *
@@ -79,6 +93,14 @@ public function EPawn GetPawn();
  */
 public function TracingIterator LeaveOnlyPawns();
 
+/**
+ *  Makes caller iterator skip any entities that are not visible in the game
+ *  world.
+ *
+ *  @return Reference to caller `TracingIterator` to allow for method chaining.
+ */
+public function TracingIterator LeaveOnlyVisible();
+
 defaultproperties
 {
 }

sources/Gameplay/KF1Frontend/KF1_Frontend.uc

@@ -34,6 +34,7 @@ public function EItemTemplateInfo GetItemTemplateInfo(BaseText templateName)
 defaultproperties
 {
     templatesClass  = class'KF1_TemplatesComponent'
+    worldClass      = class'KF1_WorldComponent'
     tradingClass    = class'KF1_TradingComponent'
     healthClass     = class'KF1_HealthComponent'
 }

sources/Gameplay/KF1Frontend/World/KF1_TracingIterator.uc

@@ -35,6 +35,7 @@ var private bool                traced;
 
 //  Iterator filters
 var private bool onlyPawns;
+var private bool onlyVisible;
 
 protected function Finalizer()
 {
@@ -57,10 +58,21 @@ public final function Initialize(Vector start, Vector end)
     initialized = true;
 }
 
+public function Vector GetTracingStart()
+{
+    return startPosition;
+}
+
+public function Vector GetTracingEnd()
+{
+    return endPosition;
+}
+
 //  Does actual tracing, but only once per iterator's lifecycle.
 //  Assumes `initialized` is `true`.
 private final function TryTracing()
 {
+    local bool              isVisible;
     local Pawn              nextPawn;
     local Actor             nextActor;
     local class<Actor>      targetClass;
@@ -87,6 +99,14 @@ private final function TryTracing()
         endPosition,
         startPosition)
     {
+        if (onlyVisible)
+        {
+            isVisible = (!nextActor.bHidden || nextActor.bWorldGeometry);
+            isVisible = isVisible && (nextActor.drawType != DT_None);
+            if (!isVisible) {
+                continue;
+            }
+        }
         hitLocations[hitLocations.length]   = nextHitLocation;
         hitNormals[hitNormals.length]       = nextHitNormal;
         nextPawn = Pawn(nextActor);
@@ -173,6 +193,7 @@ public function EPawn GetPawn()
 
 public function bool HasFinished()
 {
+    TryTracing();
     return (currentIndex >= tracedActors.length);
 }
 
@@ -190,6 +211,14 @@ public function TracingIterator LeaveOnlyPawns()
     return self;
 }
 
+public function TracingIterator LeaveOnlyVisible()
+{
+    if (initialized && !traced) {
+        onlyVisible = true;
+    }
+    return self;
+}
+
 defaultproperties
 {
 }

sources/Gameplay/KF1Frontend/World/KF1_WorldComponent.uc

@@ -17,8 +17,7 @@
  * You should have received a copy of the GNU General Public License
  * along with Acedia.  If not, see <https://www.gnu.org/licenses/>.
  */
-class KF1_WorldComponent extends AWorldComponent
+class KF1_WorldComponent extends AWorldComponent;
-    abstract;
 
 var private const float tracingDistance;
 
@@ -63,7 +62,7 @@ public function TracingIterator TracePlayerSight(EPlayer player)
     if (controller != none)
     {
         controller.PlayerCalcView(dummy, start, direction);
-        return Trace(start, direction);
+        return Trace(start, controller.rotation);
     }
     return none;
 }
@@ -80,7 +79,7 @@ public function TracingIterator TraceSight(EPawn pawn)
     if (nativePawn == none) return none;
 
     start = nativePawn.location + nativePawn.EyePosition();
-    end = start + tracingDistance * Vector(nativePawn.rotation);
+    end = start + tracingDistance * Vector(nativePawn.controller.rotation);
     return TraceBetween(start, end);
 }