func_monsterclip: Initial implementation

src/gs-entbase/server.src

@@ -50,6 +50,7 @@ server/func_plat.qc
 server/func_platrot.qc
 server/func_pendulum.qc
 server/func_vehiclecontrols.qc
+server/func_monsterclip.qc
 server/light.qc
 server/logic_auto.qc
 server/stubs.qc

src/gs-entbase/server/func_monsterclip.qc

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2023 Vera Visions LLC.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/*!QUAKED func_monsterclip (0 .5 .8) ?
+# OVERVIEW
+A clip isolated to monster entities, as long as they have a MONSTERCLIP
+spawnflag set.
+
+# KEYS
+- "targetname" : Name
+
+# TRIVIA
+This entity was introduced in Half-Life (1998).
+*/
+class
+func_monsterclip:NSEntity
+{
+public:
+	void func_monsterclip(void);
+
+	virtual void Respawn(void);
+};
+
+void
+func_monsterclip::func_monsterclip(void)
+{
+
+}
+
+void
+func_monsterclip::Respawn(void)
+{
+	ClearAngles();
+	SetOrigin(GetSpawnOrigin());
+	SetModel(GetSpawnModel());
+	SetSolid(SOLID_BSP);
+	SetMovetype(MOVETYPE_NONE);
+	SetSkin(-17); /* undocumented MONSTERCLIP */
+	Hide();
+}

src/shared/NSMonster.qc

@@ -1709,6 +1709,11 @@ NSMonster::Respawn(void)
 	SetEyePos([0, 0, m_flEyeHeight]);
 	ScheduleThink(AdjustSpawnPos, 0.0f);
 
+	if (HasSpawnFlags(MSF_MONSTERCLIP)) {
+		hitcontentsmaski = CONTENTBITS_BOXSOLID | CONTENTBIT_MONSTERCLIP;
+	} else {
+		hitcontentsmaski = CONTENTBITS_BOXSOLID;
+	}
 
 	if (m_bWeaponStartsDrawn) {
 		m_bWeaponDrawn = true;