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     8 <section id="sbalistique" revision="$Revision: 1841 $ $Name$"

     9   vendor="1.12" xmlns:xi="http://www.w3.org/2003/XInclude">

    10   <title id="stbalistique">Balistic Shot</title>

    11 

    12   <para>Balistic shooting correspond to throwing a projectile in a

    13     curve so that it fall on the target.  This shot aren't one of

    14     precision but of distance instead and the important is often not

    15     the target itself but where the projectile fall

    16     effectively.</para>

    17   

    18   <para>Balistic shots are based on the result of a manipulation roll

    19     of the weapon used (which can be a simple Throw roll for example)

    20     after you have evaluate both the distance and direction that you

    21     want to reach.  The roll give you some degrees of success (DS)

    22     which will be used to determine the point of impact of the

    23     projectile, from the target.  The consequence are then determined

    24     from the type of projectile used and the place reach by it.</para>

    25 

    26   <variablelist>

    27   <varlistentry>

    28     <term>Vertical Error (E&b;)</term>

    29       <listitem>

    30         <para>The vertical error determine the distance by which the

    31           projectile miss the target.  This error is equal to E&b; =

    32           2×D - <link linkend="tpb">P&b;</link> - DS, where the Value

    33           of D is taken with the same units as P&b;.  This Value is

    34           converted in Measure and represent the distance between the

    35           target and the effective impact position, in the direction

    36           of the shooter.  So, it can be greater than the distance

    37           between this one and the target.</para>

    38 

    39         <note userlevel="adv">

    40           <para>A consequence of this rule is that the average maximum

    41             aim distance is equal to D = P&b; + DS.  The average

    42             maximum reach is equal to the quarter of this, which is

    43             P&b; + DS - 6.</para>

    44         </note>

    45       </listitem>

    46     </varlistentry>

    47     <varlistentry>

    48       <term>Lateral Error (l)</term>

    49       <listitem>

    50         <para>The lateral error determine of how much the shot has

    51           deviated and on which side.  You must first roll ±d10.  The

    52           sign of the roll indicate the direction.  If the result is

    53           negative, the shot will go on the left-hand side of the

    54           shooter.  If the sign is positive, the shot will go on the

    55           right-hand side.  If the result is 0 (for example 3-3, or

    56           6-6) and both number are odds, the shot will go on the left.

    57           Elsewhere, it will go on the right (the dice can't be

    58           different, since this will mean that the result is not

    59           zero).  The lateral distance is equal to the Measure of E&b;

    60           - <link linkend="tlb">L&b;</link>, sum up with the absolute

    61           value of the precedent roll.  For this, the maximum E&b; is

    62           equal to P&b;+Level-3, to avoid that the projectile goes too

    63           far.</para>

    64 

    65       </listitem>

    66     </varlistentry>    

    67   </variablelist>

    68 

    69   <section id="sbalconseil">

    70     <title id="stbalconseil">Conseil d'utilisation</title>

    71 

    72     <para>This method can be a bit unconfortable for the players if it

    73       is apply mecanically.  Normally, the characters have only an

    74       approximate idea of the target distance and the one they are

    75       able to reach.  So, they should make a roll to evaluate this

    76       distance approximately.  If the roll is a success, when the

    77       target is near (with 2×D approximately lesser or equal to P&b;),

    78       the player should try it's luck and aim directly the target, the

    79       shot having good chance to hit it.  If the distance is greater,

    80       she should try slightly behind the target to get an advantage

    81       from the error to reach the target.  For sure, more the

    82       character is good, less it should go far behind (in fact, simply

    83       add the level of the character to the weapon P&b; to evaluate

    84       the effective precision of the character).  Depending on the

    85       roll results and the distance from the impact point, the

    86       character will choose if he want to throw it a little farther or

    87       a little nearer the next shot.  So, add or remove a short

    88       distance according to the will of player description of the

    89       action, and try to take it into account in the next roll,

    90       without never communicate the exact distance to the player.  And

    91       remember about the optical illusions that the landscape can

    92       create on the distance!</para>

    93     

    94     <note userlevel="adv">

    95       <para>This rule are part of those rules that I hate much: the

    96         ones where the success margin must be interpreted in a

    97         quantitative manner (it's also the case of the damage).  As

    98         said in <xref linkend="smarge"/>, the degrees of success

    99         shouldn't modify the action itself but its quality only (less

   100         or more well execute, badly or atrociously failed).  The

   101         problem here is that I doesn't really have the choice to not

   102         take the DS into account in a quantitative way since the

   103         result of an error can be very important and couldn't be

   104         without consequence!</para>

   105     </note>

   106 

   107     <note userlevel="adv">

   108       <para>For the curious, the difficulty of the roll here is the

   109         distance.  That's why this one shouldn't be taken into account

   110         when rolling for the DS.  The roll could have a difficulty of

   111         -D, and the error equation would then be E = D - P&b; - DS.

   112         However, since the difficulty affects directly DS, we have DS

   113         = DS' - D and so, E = D - P&b; - ( MR' - D ) = 2×D - P&b; -

   114         DS'.  C.Q.F.D.  This error equation so it's really a

   115         quantification of the failure margin for a choose difficulty

   116         (the distance).</para>

   117 

   118       <para>I had a method that let me have a null error for a

   119         positive roll, but it make the calculation complicate and

   120         doesn't give anything more (we simply adjust the precision

   121         factor in consequence).  This method is simpler and

   122         quicker.</para>

   123     </note>

   124   </section>

   125 </section>

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