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Add scaling for background map pan and lerp #2125

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Add scaling for background map pan and lerp #2125

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b4769fc
Make cl_neo_background_pan scale instead of bool
Rainyan Sep 10, 2026
1d914dc
Add cvar cl_neo_background_lerp
Rainyan Sep 10, 2026
59a5557
improve comment
Rainyan Sep 10, 2026
860d531
feedback: allow negative pan scale
Rainyan Sep 10, 2026
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28 changes: 23 additions & 5 deletions src/game/client/view.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -724,7 +724,11 @@ float CViewRender::GetZFar()


#ifdef NEO
ConVar cl_neo_background_pan("cl_neo_background_pan", "1", FCVAR_ARCHIVE, "Pan the camera with the cursor in the main menu background maps");
// The max pan scale value is arbitrary, chosen to prevent turning so much to see unmapped areas of the 3D background.
ConVar cl_neo_background_pan("cl_neo_background_pan", "1", FCVAR_ARCHIVE,
"Scale by which to pan the camera with the cursor in the main menu background maps", true, -10, true, 10);
ConVar cl_neo_background_lerp("cl_neo_background_lerp", "1", FCVAR_ARCHIVE,
"Scale by which to lerp the camera pan, or 0 to use frametime.", true, 0, true, 1);
#endif // NEO
//-----------------------------------------------------------------------------
// Sets up the view parameters
Expand Down Expand Up @@ -776,7 +780,8 @@ void CViewRender::SetUpViews()
}
#endif
#if defined NEO
else if (engine->IsLevelMainMenuBackground() && cl_neo_background_pan.GetBool())
// float compare because background pan can be scalar, and .GetBool() casts via int which would round down for values 0-1
else if (engine->IsLevelMainMenuBackground() && cl_neo_background_pan.GetFloat() != 0)
{
if (pPlayer)
{
Expand All @@ -794,12 +799,25 @@ void CViewRender::SetUpViews()
flX = (1 / (1 + pow(2, -CURVE_STEEPNESS * flX))) - 0.5;
flY = (1 / (1 + pow(2, -CURVE_STEEPNESS * flY))) - 0.5;

constexpr int CAMERA_MOVEMENT_MULTIPIER = 3;
// Originally, the multiplier was 3 and cl_neo_background_pan was a bool (instead of scale),
// so doing it this way instead of defaulting the cvar to 3 keeps user configs compatible.
const float CAMERA_MOVEMENT_MULTIPIER = 3 * cl_neo_background_pan.GetFloat();

flX *= CAMERA_MOVEMENT_MULTIPIER;
flY *= CAMERA_MOVEMENT_MULTIPIER;

viewEye.angles.y += flX;
viewEye.angles.x -= flY;
static Vector2D lerpedOffs(0, 0);
viewEye.angles.x -= lerpedOffs.y;
viewEye.angles.y += lerpedOffs.x;

float lerpScale = cl_neo_background_lerp.GetFloat();
if (!lerpScale)
lerpScale = Min(gpGlobals->frametime, 1.f);
Assert(IN_BETWEEN_EQ(0, lerpScale, 1));
// if lerpScale==1, then this is just an unlerped assignment
lerpedOffs.x = Lerp(lerpScale, lerpedOffs.x, flX);
lerpedOffs.y = Lerp(lerpScale, lerpedOffs.y, flY);
Assert(lerpedOffs.IsValid());
}
}
else
Expand Down