[CSGO/CSS] Grenade Path (v1.0, 14th Jan 2017)

[MYGO.pl]

After posting 2 stupid plugins (no one downloaded :( ), I decided to look through the plugin request forum to find several private request on grenade prediction. After some research, I found that theres no public plugin for this. So I decided to take a look at all the grenade related cpp files from Source SDK 2013 on github. For those interested on how i made this you can read the comments in the source code or the spoiler below:

Spoiler

Pulled grenade detection (simple):
OnPlayerRunCmd + check if player holding down IN_ATTACK + check if current player weapon is a type of grenade

Grenade detonation time: retrieved from weapon_grenade.cpp
1.5s for hegrenade and flashbang
3.0s for smokegrenade decoy (i made this up myself but it accurate)
Detonate on contact with ground for incgrenade/molotov

Calculation of grenade initial conditions (weapon_basesdkgrenade.cpp):
Initial position - offset from GetClientEyePosition
Throwing angle - calculated from the pitch angle of GetClientEyeAngles
Throwing velocity - defined in cpp file

Building the grenade path:
Use For Loop + TR_TraceHullEx + TE_SetUpBeamPoints
For Loop runs for the whole detonation time with small increments of timestep
TR_TraceHullEx with hull size of 4x4x4 box check sdk_basegrenade_projectile.cpp
TE_SetUpBeamPoints to draw the trace

For Loop Sequence:

1. Calculate endpoint for the trace of this loop using kinematics (see source code, its just x = x0 + v0 * t ) taking into account of gravity. Update grenade velocity in z direction.

2. Do a Hull Trace from Initial position to endpoint

3. Check for collision
- If there is collision, overwrite endpoints with TR_GetEndPosition
- Calculate the new grenade velocity vector using conservation of momentum (assume perfectly elastic collision first). It just simply find the component of velocity parallel to the surface normal and reverse its sign
- apply inelastic coefficient (sdk_basegrenade_projectile.h)
- check if collision is on the ground, if yes, stop calculation for incgrenade and molotov

4. Draw a laserbeam between initial position and endpoint

5. Set next start point as current endpoint

6. Repeat loop

Feature List:

• Tested and working for CS:GO hegrenade/smokegrenade/flashbang/incgrenade/decoy, molotov not tested yet
• Shows a predicted path of your grenade as you hold down the attack button (mouse left button)
• The predicted path ends at where your grenade will detonate
• Different type of grenade will have different coloured path

CVAR list:

PHP Code:

---

sm_grenadepath 1 // Enable/disable plugin
sm_grenadepath 25.0 // Number of iterations for path calculation
//higher numbers = more accurate but at your performance expense. Min: 15.0 Max: 45.0
//dont go beyond this values else it looks glitchy due to the fixed beamlife of the path and the different timestep of the loop 


---

Limitations:

• The predicted path will treat all surface as unbreakable i.e. doesnt work when your grenade breaks some props such as windows, glass
• If your map have moving surfaces or portals, does not work as well
• If you used other plugins to change the detonation time of grenades, you can edit the corresponding values in the source file
• Rarely, the grenade bounce differently since my prediction does not include angular velocity/momentum

To Do:

• Add CVars to customise beam color and size
• Solve the above limitations

[B/]Changelog:[/B]

Quote:

14th Jan 2017 (v1.0) * Initial release.

Note: If you found any bugs or have any request, please post a reply thanks! :)

Attached Files

Get Plugin or Get Source (grenadepath.sp - 9.8 KB)

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