Projectile physics hotfix from Demolitionist.

zscript/biorifle.zsc

@@ -54,6 +54,7 @@ Class BioSpark : Actor
 		+DONTSPLASH;
 		-BOUNCEAUTOOFF;
 		+BOUNCEAUTOOFFFLOORONLY;
+		+NOFRICTION;
 		BounceType "Doom";
 		BounceFactor 0.5;
 		WallBounceFactor 0.5;
@@ -195,6 +196,16 @@ Class BioGel : Actor
 		if ( (victim is 'BioHitbox') && ((victim.target == master) || (victim.target.master == master)) ) return 1;
 		return -1;
 	}
+	override void FallAndSink( double grav, double oldfloorz )
+	{
+		if ( bNOGRAVITY || (waterlevel < 1) )
+		{
+			Super.FallAndSink(grav,oldfloorz);
+			return;
+		}
+		vel *= .99;
+		if ( pos.z > floorz ) vel.z += grav*.01;	// floats in water
+	}
 	override void Tick()
 	{
 		Super.Tick();
@@ -206,7 +217,6 @@ Class BioGel : Actor
 			pitch += yawvel;
 			if ( waterlevel > 0 )
 			{
-				vel.xy *= 0.98;
 				rollvel *= 0.98;
 				pitchvel *= 0.98;
 				yawvel *= 0.98;
@@ -580,6 +590,7 @@ Class BioGel : Actor
 		+NODAMAGETHRUST;
 		+HITTRACER;
 		+INTERPOLATEANGLES;
+		+NOFRICTION;
 	}
 	States
 	{

zscript/eightball.zsc

@@ -105,6 +105,8 @@ Class RocketExplLight : PaletteLight
 
 Class UTRocket : Actor
 {
+	Mixin UTMissileFix;
+
 	Vector3 InitialDir, Acceleration;
 	int ticcnt;
 	Default

zscript/enforcer.zsc

@@ -116,6 +116,8 @@ Class Splasher : Actor
 
 Class UTCasing : Actor
 {
+	Mixin UTMissileFix;
+
 	int deadtimer, numbounces;
 	double pitchvel, anglevel;
 	double heat;

zscript/flakcannon.zsc

@@ -189,6 +189,8 @@ Class FlakAccumulator : Thinker
 
 Class FlakChunk : Actor
 {
+	Mixin UTMissileFix;
+
 	ChunkTrail trail;
 	double rollvel, pitchvel, yawvel;
 	double lifetime, lifespeed;
@@ -236,7 +238,6 @@ Class FlakChunk : Actor
 		if ( isFrozen() ) return;
 		if ( waterlevel > 0 )
 		{
-			vel.xy *= 0.98;
 			rollvel *= 0.98;
 			pitchvel *= 0.98;
 			yawvel *= 0.98;
@@ -483,6 +484,8 @@ Class SlugLight : PaletteLight
 
 Class FlakSlug : Actor
 {
+	Mixin UTMissileFix;
+
 	Default
 	{
 		Obituary "$O_FLAKCANNON";
@@ -504,11 +507,6 @@ Class FlakSlug : Actor
 		Super.PostBeginPlay();
 		vel.z += 3;
 	}
-	override void Tick()
-	{
-		Super.Tick();
-		if ( waterlevel > 0 ) vel.xy *= 0.98;
-	}
 	action void A_FlakExplode()
 	{
 		bForceXYBillboard = true;

zscript/pulsegun.zsc

@@ -56,6 +56,7 @@ Class PulseSpark : Actor
 		+DONTSPLASH;
 		+CANBOUNCEWATER;
 		-BOUNCEAUTOOFF;
+		+NOFRICTION;
 		BounceType "Doom";
 		BounceFactor 1.0;
 		WallBounceFactor 1.0;
@@ -174,6 +175,7 @@ Class PulseBall : Actor
 		+EXPLODEONWATER;
 		+SKYEXPLODE;
 		+FORCEXYBILLBOARD;
+		+NOFRICTION;
 		Scale 0.19;
 		Speed 22;
 		Radius 2;

zscript/ripper.zsc

@@ -70,6 +70,7 @@ Class Razor2 : Actor
 		+CANBOUNCEWATER;
 		+NODAMAGETHRUST;
 		+DONTBOUNCEONSHOOTABLES;
+		+NOFRICTION;
 	}
 	override void PostBeginPlay()
 	{

zscript/shockrifle.zsc

@@ -219,6 +219,7 @@ Class ShockSpark : Actor
 		+DONTSPLASH;
 		+CANBOUNCEWATER;
 		-BOUNCEAUTOOFF;
+		+NOFRICTION;
 		BounceType "Doom";
 		BounceFactor 1.0;
 		WallBounceFactor 1.0;
@@ -290,6 +291,7 @@ Class ShockBeam : Actor
 		+FORCERADIUSDMG;
 		+NODAMAGETHRUST;
 		+NOTELEPORT;
+		+NOFRICTION;
 	}
 	override void PostBeginPlay()
 	{
@@ -451,6 +453,7 @@ Class SuperShockSpark : Actor
 		+DONTSPLASH;
 		+CANBOUNCEWATER;
 		-BOUNCEAUTOOFF;
+		+NOFRICTION;
 		BounceType "Doom";
 		BounceFactor 1.0;
 		WallBounceFactor 1.0;
@@ -900,6 +903,7 @@ Class ShockBall : Actor
 		+EXPLODEONWATER;
 		+FORCERADIUSDMG;
 		+NODAMAGETHRUST;
+		+NOFRICTION;
 	}
 	States
 	{
@@ -996,6 +1000,7 @@ Class SuperShockBall : Actor
 		+EXPLODEONWATER;
 		+FORCERADIUSDMG;
 		+NODAMAGETHRUST;
+		+NOFRICTION;
 	}
 	States
 	{

zscript/translocator.zsc

@@ -120,6 +120,8 @@ Class TranslocatorGlow : Actor
 
 Class TranslocatorModule : Actor
 {
+	Mixin UTMissileFix;
+
 	Actor b;
 	bool alreadyhit;
 

zscript/utcommon.zsc

@@ -15,6 +15,25 @@ const firstbloodmsg_id = -1401;
 const spreemsg_id = -1402;
 const multimsg_id = -1403;
 
+// backported from DEMOLITIONIST, needed to fix the broken water physics of some projectiles
+Mixin Class UTMissileFix
+{
+	Default
+	{
+		+NOFRICTION;
+	}
+	override void FallAndSink( double grav, double oldfloorz )
+	{
+		if ( bNOGRAVITY || (waterlevel < 1) )
+		{
+			Super.FallAndSink(grav,oldfloorz);
+			return;
+		}
+		vel *= .99;
+		if ( pos.z > floorz ) vel.z -= grav*.01;
+	}
+}
+
 Class UTPlayer : DoomPlayer
 {
 	bool doprintnoammo;
@@ -2149,6 +2168,7 @@ Class UTSpark : Actor
 		+THRUACTORS;
 		+NOTELEPORT;
 		+DONTSPLASH;
+		+NOFRICTION;
 		BounceType "Doom";
 		BounceFactor 0.4;
 		Gravity 0.2;
@@ -2209,6 +2229,8 @@ Class UTViewSpark : UTSpark
 
 Class UTChip : Actor
 {
+	Mixin UTMissileFix;
+
 	int deadtimer;
 	double rollvel, anglevel, pitchvel;
 

zscript/utgore.zsc

@@ -60,6 +60,8 @@ Class UTBlood : Actor
 // single drop of blod
 Class UTBloodDrop : Actor
 {
+	Mixin UTMissileFix;
+
 	Default
 	{
 		Scale 0.24;
@@ -450,6 +452,8 @@ Class UTPlayerGibber : UTGibber
 // Chunks
 Class UTGib : Actor
 {
+	Mixin UTMissileFix;
+
 	double rollvel, anglevel, pitchvel;
 
 	Default

zscript/warheadlauncher.zsc

@@ -280,6 +280,7 @@ Class WarShell : Actor
 		+FORCERADIUSDMG;
 		+EXPLODEONWATER;
 		+INTERPOLATEANGLES;
+		+NOFRICTION;
 	}
 	override void PostBeginPlay()
 	{