BNG_Pong_ballcoll2

// and if ball is travelling towards player (-ve direction)
if (ballDirX < 0)
{
    // stretch the paddle to indicate a hit
    paddle1.scale.y = 15;

    // switch direction of ball travel to create bounce
    ballDirX = -ballDirX;

    // we impact ball angle when hitting it
    // this is not realistic physics, just spices up the gameplay
    // allows you to 'slice' the ball to beat the opponent
    ballDirY -= paddle1DirY * 0.7;
}