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Modifying movement code


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mrshark45
Member
Join Date: Jan 2016
Old 01-15-2021 , 03:48   Modifying movement code
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I'm trying to solve a well known bug, when surfing with high fps sometimes you get stuck, I wrote a plugin that kind of moves you back a frame everytime you get stuck, it worked well on singleplayer server, but on a dedicated server it lagged a lot, so I though that maybe the plugin was not efficent enough so I tried to write a module, but I ran into the same problem: video ( first half of the video is without the module and the rest with).
This is the module code :
PHP Code:
vec3_t lastVel[33];
vec3_t lastOrg[33];


bool is_vector_zero(struct vec3_t v){
    return 
v[0] == 0.0 && v[1] == 0.0;
}

bool IsUserSurfing(struct playermove_spMove){
    if (!
pMove->deadflag)
    {
        if (
pMove->onground)
        {
            
vec3_t end;
            
pmtrace_t trace;
            for (
int i 03i++)
            {
                
float flScale pMove->frametime pMove->velocity[i];
                
end[i] = pMove->origin[i] + flScale;
            }
            
            
trace pMove->PM_PlayerTrace(pMove->originendPM_NORMAL, -1);
            
vec3_t plane trace.plane.normal;
            if (
plane[2] != 0.0 && plane[2] != 1.0) {
                return 
1;
            }

        }
    }
    return 
0;
}

void PM_Move(struct playermove_s *pMoveqboolean server) {
    if (
IsUserSurfing(pMove)) {
        
int player pMove->player_index;
        
vec3_t vel pMove->velocity;
        
vec3_t org pMove->origin;

        if (!
is_vector_zero(pMove->velocity)) {
            
lastVel[player] = vel;
            
lastOrg[player] = org;
        }
        else if (!
is_vector_zero(lastVel[player])) {
            
pMove->velocity lastVel[player];
            
lastOrg[player][2] += 0.1;
            
pMove->origin lastOrg[player];
        }
        
    }
    
 } 
I hooked PM_Move and checked when the player gets stuck while surfing and setted his previous velocity and moved him 0.1 units upwards to unstuck him.
As I said it worked very well on a singleplayer server but when used on a dedicated one it lagged, like everytime you got stucked you will notice, it drags you forward, I think that maybe the player's ping may be causing this.
I was wondering if I can modify directly the movement code, like *supercede* the original code with mine?
I'm kind of new to writing modules, started 2-3 days ago to learn.
Is the movement code for players running on client side, is it something that I can do to modify it more efficiently?
Or correct it in some way, like in PM_Move_Post?
mrshark45 is offline
KliPPy
AlliedModders Donor
Join Date: May 2013
Location: Serbia
Old 01-18-2021 , 16:58   Re: Modifying movement code
Reply With Quote #2

Quote:
Originally Posted by mrshark45 View Post
Is the movement code for players running on client side
Yeah, and it's probably client misprediction that causes that. I believe there's no way of avoiding it, unless you eliminate the root cause of getting stuck in place (and replicate that to clients somehow).
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mrshark45
Member
Join Date: Jan 2016
Old 01-19-2021 , 07:59   Re: Modifying movement code
Reply With Quote #3

Quote:
Originally Posted by KliPPy View Post
Yeah, and it's probably client misprediction that causes that. I believe there's no way of avoiding it, unless you eliminate the root cause of getting stuck in place (and replicate that to clients somehow).
That's what I'm asking if there's a way to prevent it before it's happening...
mrshark45 is offline
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