Physics(Kisak Physics)

[LWSS]

This is an issue dedicated to the rebuilt open-source physics_client.so in branch physics-test Folders: (/vphysics and /ivp)

Due to potential instability compared to the real valve physics_client.so, this is an optional build step.
Use -DUSE_KISAK_PHYSICS=1 in your cmake build line to enable

Kisak physics uses a custom name kisakvphysics_client.so as to not overwrite the original file if you choose to use it.

Issues

• ragdolls are fubar'd. I think this is because of axis mismatch? fixed: was due to improper gravity axis and compiler optimization settings. The exact files causing them to spasm on -O2 need to be looked at closer.
• msg spam from some hacks
• Some maps with built-in physics objects will cause invalid origin from vphysics! spam and lag the game considerably (ex: train/militia). Previously these maps would just crash on load, but commit 62eb192 has enabled them to at least load.
• Multiple files from ivp_physics will just break when compiling with -O2 or any optimizations, this should be investigated more.

Notes

• Grenades seem ok, but should do more testing. Grenades are custom no matter which physics lib
• Lots of hacking was done to get this to work, search the code for "lwss" or even "lwss hack" if you want to hunt bugs.
• One major thing I didn't re-implement was the physics prediction, I am not sure of the consequences of leaving this out. It could be physics-state desync from other clients or perhaps some extreme jerking. This won't show up until there is some network latency I imagine.
• If we let servers have a choice, then the client should sync to that choice otherwise there will 99% be de-sync between clients with different physics lib.

[dr3murr]

there is an open-source vphysics that was used in gmod for some time at https://github.com/DrChat/Gmod-vphysics

[LWSS]

there is an open-source vphysics that was used in gmod for some time at https://github.com/DrChat/Gmod-vphysics

Neat, thanks I'll check this out

[LWSS]

@r3muxd
Hey, we now have working bullet physics in the game