inline const Vector &CShotManipulator::ApplySpread( const Vector &vecSpread, float bias )
{
    // get circular gaussian spread
    float x, y, z;

    if ( bias > 1.0 )
        bias = 1.0;
    else if ( bias < 0.0 )
        bias = 0.0;

    float shotBiasMin = ai_shot_bias_min.GetFloat();
    float shotBiasMax = ai_shot_bias_max.GetFloat();

    // 1.0 gaussian, 0.0 is flat, -1.0 is inverse gaussian
    float shotBias = ( ( shotBiasMax - shotBiasMin ) * bias ) + shotBiasMin;

    float flatness = ( fabsf(shotBias) * 0.5 );

    do
    {
        x = random->RandomFloat(-1,1) * flatness + random->RandomFloat(-1,1) * (1 - flatness);
        y = random->RandomFloat(-1,1) * flatness + random->RandomFloat(-1,1) * (1 - flatness);
        if ( shotBias < 0 )
        {
            x = ( x >= 0 ) ? 1.0 - x : -1.0 - x;
            y = ( y >= 0 ) ? 1.0 - y : -1.0 - y;
        }
        z = x*x+y*y;
    } while (z > 1);

    m_vecResult = m_vecShotDirection + x * vecSpread.x * m_vecRight + y * vecSpread.y * m_vecUp;

    return m_vecResult;
}