Ok let me help you a bit with the language settings for xp_physics.

xp_physics is a "bitmask variable" what this mean ? it means that his value its the result of more values of the same kind we call them "bit values", "bit flags" or simple "flags". These that are actually stored and more important then the result number which is hard to understand at first glance.

These flags are some numbers but they are defined by an Named Constant . These are the values/names for xp_physics in 2.2a:

* 1    PHYSICS_CONTROL_FORWARD     Enables forward physics control
* 2    PHYSICS_CONTROL_SIDEWARD    Enables sideward physics control
* 4    PHYSICS_CONTROL_STOP        Enables air stopping control
* 16   PHYSICS_RAMP_JUMPS          Enables ramp jumps
* 32   PHYSICS_DOUBLE_JUMPS        Enables double jumps
* 64   PHYSICS_QUAKE_LIVE          Enables a bunch of QL physics
* 128  PHYSICS_AIR_STEPS           Enables air stepping
* 256  PHYSICS_STEP_JUMPS          Fixes step jumps

Ok so 51 in xp_physics means :

* 1    PHYSICS_CONTROL_FORWARD     Enables forward physics control
* 2    PHYSICS_CONTROL_SIDEWARD    Enables sideward physics control
* 16   PHYSICS_RAMP_JUMPS          Enables ramp jumps
* 32   PHYSICS_DOUBLE_JUMPS        Enables double jumps

And 55 in xp_physics means :

* 1    PHYSICS_CONTROL_FORWARD     Enables forward physics control
* 2    PHYSICS_CONTROL_SIDEWARD    Enables sideward physics control
* 4    PHYSICS_CONTROL_STOP        Enables air stopping control
* 16   PHYSICS_RAMP_JUMPS          Enables ramp jumps
* 32   PHYSICS_DOUBLE_JUMPS        Enables double jumps

So the difference is that 55 has this flag:

* 4    PHYSICS_CONTROL_STOP        Enables air stopping control

The new version have now 2 more flags: PHYSICS_AIR_STEPS, PHYSICS_STEP_JUMPS and the negation of the flag PHYSICS_NO_RAMP_JUMPS was split into 2: PHYSICS_RAMP_JUMPS, PHYSICS_DOUBLE_JUMPS. (this means that if you didn't had this value in 2.1you need to put both of them to get the same physics)
Easy said he wants ppl to experiment with the new values and seek which is better.

Here are his words:

wrote:

In v2.1 we had PHYSICS_NO_RAMP_JUMPS. Unfortunately this included two physics which could not be toggled separately. In v2.2 we have divided it into the two components and while at it also got rid of the negation.

While this now grants more freedome to config authors, it will break most, if not all, currently available configs. Following this simple step you can make your config compatible again in no time.

If your config had PHYSICS_NO_RAMP_JUMPS, just drop it. If it did not had PHYSICS_NO_RAMP_JUMPS you will have to add PHYSICS_RAMP_JUMPS and PHYSICS_DOUBLE_JUMPS to get the same behaviour.

We also encourage all config authors to evaluate the new physics PHYSICS_AIR_STEPS and PHYSICS_STEP_JUMPS. They can be a great addition.

I hope this helps and doesn't give more headache.
__________
epsislow

what is air stepping, walking on air?

Note that xp_physics description is missing 4th bit (value=8) maybe that makes the difference.

wrote:

* 4 PHYSICS_CONTROL_STOP Enables air stopping control

I don't know what is it exactly for, but my previous post is still valide. With this thing we can't move and aim as we used to do with physics 3. It has nothing to do with the new stuff implemented (this is not about step 16 or 32). To have same feels has before we need xp_physics 51( and not 55). Now 51=3 and 55=7.

Then better discover how does it work...

This is another in air control witch allows u to control more in air by a backward key... it means the movement is more sensitive for backward key and by pressing the key u can brake down a lot more effective then before where u have only a minor influence on it, anyway by pressing any other key that's will move yours character in game to opposite direction to the direction of yours in air movement will result the same way.

It has completely nothing to do with hitbox hitscanweapons or aiming in general, the reason u can't aim as u have get used in air it is u don't know how to control the air movement now when it is more sensitive nothing more...

I don't need to explain what benefits give more control in air movement, but it requires dropping down the habits u have learned or better knowledge about movement (witch most of the players don't have since they started playing quake in e+ instead of mods like osp and cpma where this kind of movement is something normal)