Greetings everyone,
There is an intermittent bug with the codebase where in
some situations the first person spectating of other players can become
very laggy, as interpolation for m_angEyeAngles stops. This problem is most
easily found when the spectator target's viewmodel is hidden and thus isn't
requiring interpolation (meaning there is no reason to interpolate the parent
player either).
This bug
is present in TF2's code as well as I've seen it there too. The
issue is that the player's ShouldInterpolate() doesn't take into
account if the local player is spectating this player or not, causing it
to no longer have it's interpolated variables (like m_iv_angEyeAngles)
processed. I've been hunting this bug for a while in my mod and finally
solved it, and I figured I'd share the solution here:
In c_baseplayer.cpp, go to the ShouldInterpolate() function, and add this at
the bottom above BaseClass::ShouldInterpolate():
if ( GetLocalPlayer() && GetLocalPlayer()->GetObserverTarget() == this )
return true;
This will fix it. Hope this helps!
Note: I didn't look too much into this, but the spectating of players is done
via CalcView which doesn't appear to change what render->GetViewEntity()
returns - the entity returned by this always interpolated, which would seem to
be the intended way for this to work, but doesn't in practice.
Regards,
Peter
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