Improved Player Physics

celeron55 · Feb 13, 2013 · df3c925 · df3c925
1 parent 86b906d
commit df3c925
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Showing 10 changed files with 296 additions and 110 deletions.
diff --git a/minetest.conf.example b/minetest.conf.example
@@ -245,6 +245,21 @@
 # Files that are not present would be fetched the usual way
 #remote_media =
 
+# Physics stuff
+#movement_acceleration_default = 2
+#movement_acceleration_air = 0.5
+#movement_acceleration_fast = 4
+#movement_speed_walk = 4
+#movement_speed_crouch = 1.35
+#movement_speed_fast = 20
+#movement_speed_climb = 2
+#movement_speed_jump = 6.5
+#movement_speed_descend = 6
+#movement_liquid_fluidity = 1
+#movement_liquid_fluidity_smooth = 0.5
+#movement_liquid_sink = 10
+#movement_gravity = 9.81
+
 # Mapgen stuff
 #mg_name = v6
 #water_level = 1

diff --git a/src/client.cpp b/src/client.cpp
@@ -1514,6 +1514,26 @@ void Client::ProcessData(u8 *data, u32 datasize, u16 sender_peer_id)
 			}
 		}
 	}
+	else if(command == TOCLIENT_MOVEMENT)
+	{
+		std::string datastring((char*)&data[2], datasize-2);
+		std::istringstream is(datastring, std::ios_base::binary);
+		Player *player = m_env.getLocalPlayer();
+		assert(player != NULL);
+
+		player->movement_acceleration_default = readF1000(is) * BS;
+		player->movement_acceleration_air = readF1000(is) * BS;
+		player->movement_acceleration_fast = readF1000(is) * BS;
+		player->movement_speed_walk = readF1000(is) * BS;
+		player->movement_speed_crouch = readF1000(is) * BS;
+		player->movement_speed_fast = readF1000(is) * BS;
+		player->movement_speed_climb = readF1000(is) * BS;
+		player->movement_speed_jump = readF1000(is) * BS;
+		player->movement_liquid_fluidity = readF1000(is) * BS;
+		player->movement_liquid_fluidity_smooth = readF1000(is) * BS;
+		player->movement_liquid_sink = readF1000(is) * BS;
+		player->movement_gravity = readF1000(is) * BS;
+	}
 	else if(command == TOCLIENT_HP)
 	{
 		std::string datastring((char*)&data[2], datasize-2);

diff --git a/src/clientserver.h b/src/clientserver.h
@@ -364,6 +364,23 @@ enum ToClientCommand
 		u16 len
 		u8[len] formname
 	*/
+
+	TOCLIENT_MOVEMENT = 0x45,
+	/*
+		u16 command
+		f1000 movement_acceleration_default
+		f1000 movement_acceleration_air
+		f1000 movement_acceleration_fast
+		f1000 movement_speed_walk
+		f1000 movement_speed_crouch
+		f1000 movement_speed_fast
+		f1000 movement_speed_climb
+		f1000 movement_speed_jump
+		f1000 movement_liquid_fluidity
+		f1000 movement_liquid_fluidity_smooth
+		f1000 movement_liquid_sink
+		f1000 movement_gravity
+	*/
 };
 
 enum ToServerCommand

diff --git a/src/defaultsettings.cpp b/src/defaultsettings.cpp
@@ -172,6 +172,20 @@ void set_default_settings(Settings *settings)
 	settings->setDefault("congestion_control_max_rate", "400");
 	settings->setDefault("congestion_control_min_rate", "10");
 	settings->setDefault("remote_media", "");
+
+	// physics stuff
+	settings->setDefault("movement_acceleration_default", "2");
+	settings->setDefault("movement_acceleration_air", "0.5");
+	settings->setDefault("movement_acceleration_fast", "8");
+	settings->setDefault("movement_speed_walk", "4");
+	settings->setDefault("movement_speed_crouch", "1.35");
+	settings->setDefault("movement_speed_fast", "20");
+	settings->setDefault("movement_speed_climb", "2");
+	settings->setDefault("movement_speed_jump", "6.5");
+	settings->setDefault("movement_liquid_fluidity", "1");
+	settings->setDefault("movement_liquid_fluidity_smooth", "0.5");
+	settings->setDefault("movement_liquid_sink", "10");
+	settings->setDefault("movement_gravity", "9.81");
 
 	//mapgen related things
 	settings->setDefault("mg_name", "v6");

diff --git a/src/environment.cpp b/src/environment.cpp
@@ -2065,20 +2065,37 @@ void ClientEnvironment::step(float dtime)
 			{
 				// Gravity
 				v3f speed = lplayer->getSpeed();
-				if(lplayer->swimming_up == false)
-					speed.Y -= 9.81 * BS * dtime_part * 2;
+				if(lplayer->in_liquid == false)
+					speed.Y -= lplayer->movement_gravity * dtime_part * 2;
 
-				// Water resistance
-				if(lplayer->in_water_stable || lplayer->in_water)
-				{
-					f32 max_down = 2.0*BS;
-					if(speed.Y < -max_down) speed.Y = -max_down;
+				// Liquid floating / sinking
+				if(lplayer->in_liquid && !lplayer->swimming_vertical)
+					speed.Y -= lplayer->movement_liquid_sink * dtime_part * 2;
 
-					f32 max = 2.5*BS;
-					if(speed.getLength() > max)
-					{
-						speed = speed / speed.getLength() * max;
-					}
+				// Liquid resistance
+				if(lplayer->in_liquid_stable || lplayer->in_liquid)
+				{
+					// How much the node's viscosity blocks movement, ranges between 0 and 1
+					// Should match the scale at which viscosity increase affects other liquid attributes
+					const f32 viscosity_factor = 0.3;
+
+					v3f d_wanted = -speed / lplayer->movement_liquid_fluidity;
+					f32 dl = d_wanted.getLength();
+					if(dl > lplayer->movement_liquid_fluidity_smooth)
+						dl = lplayer->movement_liquid_fluidity_smooth;
+					dl *= (lplayer->liquid_viscosity * viscosity_factor) + (1 - viscosity_factor);
+
+					v3f d = d_wanted.normalize() * dl;
+					speed += d;
+
+#if 0 // old code
+					if(speed.X > lplayer->movement_liquid_fluidity + lplayer->movement_liquid_fluidity_smooth)	speed.X -= lplayer->movement_liquid_fluidity_smooth;
+					if(speed.X < -lplayer->movement_liquid_fluidity - lplayer->movement_liquid_fluidity_smooth)	speed.X += lplayer->movement_liquid_fluidity_smooth;
+					if(speed.Y > lplayer->movement_liquid_fluidity + lplayer->movement_liquid_fluidity_smooth)	speed.Y -= lplayer->movement_liquid_fluidity_smooth;
+					if(speed.Y < -lplayer->movement_liquid_fluidity - lplayer->movement_liquid_fluidity_smooth)	speed.Y += lplayer->movement_liquid_fluidity_smooth;
+					if(speed.Z > lplayer->movement_liquid_fluidity + lplayer->movement_liquid_fluidity_smooth)	speed.Z -= lplayer->movement_liquid_fluidity_smooth;
+					if(speed.Z < -lplayer->movement_liquid_fluidity - lplayer->movement_liquid_fluidity_smooth)	speed.Z += lplayer->movement_liquid_fluidity_smooth;
+#endif
 				}
 
 				lplayer->setSpeed(speed);