[abdul-rehman]

After searching a bit i found out that the only way to retrieve a normal plane from a vectors tip is to use traceline and the get the normal plane by using (TR_vecnormal... etc)
But what if i m not using traceline (and dont want to!) and i want to get a normal plane from a vector's tip for eg:
I have this code:

static forvec[3];

// Get a forward vector in the direction of player's aim
velocity_by_aim(player_id, 15, forvec)

now the forvec variable contains a vector of lenght 15 units which is pointing in the direction of player's aim, now i want to get a normal plane at the tip of the vector such that the plane will be infront of the player (in other words it will be perpendicular to the forvec)

The question is how can i get the normal to this vector without using the traceline function ?

[fysiks]

What exactly are you trying to do?

There is no normal vector for a vector. The vector you have is the normal for the plane.

[Sylwester]

PHP Code:

public vec3_normalize(Float:v[3]){
    new Float:len = floatsqroot(v[0]*v[0] + v[1]*v[1] + v[2]*v[2])
    for(new i=0; i<3; i++){
        v[i] /= len
    }
}

public vec3_mult(Float:v1[3], Float:v2[3], Float:vret[3]){
    vret[0] = v1[1]*v2[2]-v1[2]*v2[1]
    vret[1] = v1[2]*v2[0]-v1[0]*v2[2]
    vret[2] = v1[0]*v2[1]-v1[1]*v2[0]
}

new Float:forvec[3]; 

// Get a forward vector in the direction of player's aim 
velocity_by_aim(player_id, 15, forvec)

new Float:hvec[3], Float:vvec[3]
hvec[0] = forvec[1]
hvec[1] = forvec[0]
hvec[2] = 0.0

vec3_mult(forvec, hvec, vvec) 


First you make horizontal vector and then multiply both of them to get vertical vector.
Use vec3_normalize to change length of any vector to 1.

It will work assuming that forvec[1] and forvec[0] will never be equal 0.0 at the same time (I'm not sure if that can happen when aiming vertically up or down). Otherwise it may be safer to do it using angles.

[abdul-rehman]

Nvm i found another way of doing it. (angle_vector)