Sprite Interpolation
From Xash3D
Sprite Interpolation
Enabled by default. This provides smoother animation for sprites that have their rendermode set to texture and additive. To enable or disable interpolation, use the r_sprite_lerping console variable.
Note: For correct interpolation, make sure the server framerate is exactly 10 FPS (regardless of the sprite’s own FPS in pev | framerate). This parameter is dictated by the frame changer function’s think time, which is 0.1s and remains unchanged in most mods.