Prop Footsteps

From Valve Developer Community

Note: This issue has been resolved in the Half-Life 2: Episode Two codebase; if you are using its code, you should not try to implement this mod.

For player footsteps, Valve used MASK_PLAYERSOLID_BRUSHONLY rather than MASK_PLAYERSOLID. This difference made it so only the static world would have dynamic footsteps. The following precedure will show how to fix this issue.

Note: This will not make any difference if PlayStepSound is overridden by the player entity (i.e. HL2MP).

Table of contents

1 Basic Fix

1.1 src\cl_dll\c_baseplayer.cpp

1.1.1 Shift Trace Start Up
1.1.2 Smaller Trace Box Height
1.1.3 Change Trace Mask

1.2 src\game_shared\gamemovement.cpp

1.2.1 Shift Trace Start Up
1.2.2 Smaller Trace Box Height & Change Trace Mask

2 HL2MP Override Removal

2.1 src\cl_dll\hl2mp\c_hl2mp_player.h

2.1.1 Prototype Removal

2.2 src\game_shared\hl2mp\hl2mp_player_shared.cpp

2.2.1 Symbol Removal

2.3 src\dlls\hl2mp_dll\hl2mp_player.cpp

2.3.1 Precache

2.4 src\dlls\hl2mp_dll\hl2mp_player.h

2.4.1 Prototype Removal

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Basic Fix

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src\cl_dll\c_baseplayer.cpp

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Shift Trace Start Up

	// Straight down
	end.z -= 64;

→

	// Straight down
	start.z += 1;
	end.z -= 64;

[edit]

Smaller Trace Box Height

	Ray_t ray;
	ray.Init( start, end, GetPlayerMins(), GetPlayerMaxs() );

↓

	Ray_t ray;
	Vector mins = GetPlayerMins();
	Vector maxs = GetPlayerMaxs();
	maxs.z = mins.z + 1;
	ray.Init( start, end, mins, maxs);

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Change Trace Mask

	UTIL_TraceRay( ray, MASK_PLAYERSOLID_BRUSHONLY, this, COLLISION_GROUP_PLAYER_MOVEMENT, &trace );

↓

	UTIL_TraceRay( ray, MASK_PLAYERSOLID, this, COLLISION_GROUP_PLAYER_MOVEMENT, &trace );

[edit]

src\game_shared\gamemovement.cpp

[edit]

Shift Trace Start Up

	// Straight down
	end[2] -= 64;

→

	// Straight down
	start[2] += 1;
	end[2] -= 64;

[edit]

Smaller Trace Box Height & Change Trace Mask

	TracePlayerBBox( start, end, MASK_PLAYERSOLID_BRUSHONLY, COLLISION_GROUP_PLAYER_MOVEMENT, trace );

↓

	Ray_t ray;
	Vector mins = player->GetPlayerMins();
	Vector maxs = player->GetPlayerMaxs();
	maxs.z = mins.z + 1;
	ray.Init( start, end, mins, maxs);
	UTIL_TraceRay( ray, MASK_PLAYERSOLID, player, COLLISION_GROUP_PLAYER_MOVEMENT, &trace );

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