[Nero_3D]

I first thought it would create a square around the player in the direction he is facing

But if it is just a square you only need two loops

pawn Code:

stock CreateSquareObjectShape(playerid, Float: fDiag, objectsPerLine = 10) {
    new
        Float: rX[2],
        Float: rY[2],
        Float: fZ
    ;
    if(GetPlayerPos(playerid, fX[0], fY[0], fZ)) {
        new
            Float: inc = (fDiag * 0.707 / objectsPerLine),
            Float: cos = (fDiag * floatcos(45, degrees)),
            Float: sin = (fDiag * floatsin(45, degrees))
        ;
        rX[1] = rX[0] + cos;
        rY[1] = rY[0] + sin;
        
        rX[0] -= cos;
        rY[0] -= sin;

        for(cos = rX[1]; cos > rX[0]; cos -= inc) {
            CreateObject(1598, cos, rY[0], fZ, 0, 0, 0);
            CreateObject(1598, cos, rY[1], fZ, 0, 0, 0);
        }
        for(sin = rY[1]; sin > rY[0]; sin -= inc) {
            CreateObject(1598, rX[0], sin, fZ, 0, 0, 0);
            CreateObject(1598, rX[1], sin, fZ, 0, 0, 0);
        }
        return true;
    }
    return false;
}