Make projectiles use most sensible blocker scan radius

By default, but allow custom overrides.

OpenRA.Mods.Common/Projectiles/LaserZap.cs

@@ -22,7 +22,7 @@ using OpenRA.Traits;
 namespace OpenRA.Mods.Common.Projectiles
 {
 	[Desc("Not a sprite, but an engine effect.")]
-	public class LaserZapInfo : IProjectileInfo
+	public class LaserZapInfo : IProjectileInfo, IRulesetLoaded<WeaponInfo>
 	{
 		[Desc("The width of the zap.")]
 		public readonly WDist Width = new WDist(86);
@@ -46,9 +46,6 @@ namespace OpenRA.Mods.Common.Projectiles
 		[Desc("Maximum offset at the maximum range.")]
 		public readonly WDist Inaccuracy = WDist.Zero;
 
-		[Desc("Extra search radius beyond beam width. Required to ensure affecting actors with large health radius.")]
-		public readonly WDist TargetExtraSearchRadius = new WDist(1536);
-
 		[Desc("Beam can be blocked.")]
 		public readonly bool Blockable = false;
 
@@ -77,11 +74,21 @@ namespace OpenRA.Mods.Common.Projectiles
 
 		[PaletteReference] public readonly string HitAnimPalette = "effect";
 
+		[Desc("Scan radius for actors with projectile-blocking trait. If set to zero (default), it will automatically scale",
+			"to the blocker with the largest health shape. Only set custom values if you know what you're doing.")]
+		public WDist BlockerScanRadius = WDist.Zero;
+
 		public IProjectile Create(ProjectileArgs args)
 		{
 			var c = UsePlayerColor ? args.SourceActor.Owner.Color.RGB : Color;
 			return new LaserZap(this, args, c);
 		}
+
+		public void RulesetLoaded(Ruleset rules, WeaponInfo wi)
+		{
+			if (BlockerScanRadius == WDist.Zero)
+				BlockerScanRadius = Util.MinimumRequiredBlockerScanRadius(rules);
+		}
 	}
 
 	public class LaserZap : IProjectile, ISync
@@ -126,7 +133,7 @@ namespace OpenRA.Mods.Common.Projectiles
 			// Check for blocking actors
 			WPos blockedPos;
 			if (info.Blockable && BlocksProjectiles.AnyBlockingActorsBetween(world, source, target,
-				info.Width, info.TargetExtraSearchRadius, out blockedPos))
+				info.Width, info.BlockerScanRadius, out blockedPos))
 			{
 				target = blockedPos;
 			}