Re: AS - Artificial Stupidity. Enemy isnt responding correctly...

SomeRhino — Sun, 20 Apr 2008 13:48:09 GMT

One thing that may be causing problems is that you are doing a == test on two floats in the main if clause, and the chances of two floats being exactly equal is quite improbable. I doubt this test would ever pass. Try using a range like

if (Math.Abs(float1 - float2) < 0.1f)
{ ... }

Please elaborate on what the AI does once it gets in range.

AS - Artificial Stupidity. Enemy isnt responding correctly...

MatSav — Sun, 20 Apr 2008 11:49:34 GMT

Hello everyone,

My enemies are not exactly very responsive. It changes states and moves toward you along the z axis (all that is needed) but when it comes within range, it is meant to rotate to face the player and then shoot 2 shots one from either side of it. (its only a box till the model is finished). It doesnt do this. Here is the code from AI.cs. Please tell me if any more is needed...

        private void shootAtPlayer(Player player, Bullet[] enemyBullet, int difficulty)
        {
            rotation = turnToFaceO(toRotationVector2(position), toRotationVector2(player.position), rotation, 0.025f);
            elevation = turnToFaceE(toElevationVector2(position), toElevationVector2(player.position), elevation, 0.025f);
            if (!(rotation == playerOrientation && elevation == playerElevation))
            {
                rotation = turnToFaceO(toRotationVector2(position), toRotationVector2(player.position), rotation, 0.025f);
                elevation = turnToFaceE(toElevationVector2(position), toElevationVector2(player.position), elevation, 0.025f);
            }
            else
            {
                for (int i = 0; i < GameConstants.enemyClip; i++)
                    if (!enemyBullet.isActive)
                    {
                        Matrix orientationMatrix = Matrix.CreateRotationY(rotation);
                        Matrix elevationMatrix = Matrix.CreateRotationX(elevation);
                        Matrix trans = Matrix.CreateTranslation(player.position) * elevationMatrix * orientationMatrix;
                        enemyBullet.direction = trans.Translation;
                        enemyBullet.position = position + (trans.Right * 2f) + (trans.Forward * 2f);
                        enemyBullet.isActive = true;
                        break;
                    }
                for (int i = 0; i < GameConstants.enemyClip; i++)
                    if (!enemyBullet.isActive)
                    {
                        Matrix orientationMatrix = Matrix.CreateRotationY(rotation);
                        Matrix elevationMatrix = Matrix.CreateRotationX(elevation);
                        Matrix trans = Matrix.CreateTranslation(position) * elevationMatrix * orientationMatrix;
                        enemyBullet.direction = trans.Translation;
                        enemyBullet.position = position + (trans.Left * 2f) + (trans.Forward * 2f);
                        enemyBullet.isActive = true;
                        break;
                    }
                //soundBank.PlayCue("EnemyShoot");
            }
        }

        private Vector2 toRotationVector2(Vector3 v) { return new Vector2(v.X, v.Z); }
        private Vector2 toElevationVector2(Vector3 v) { return new Vector2((float)Math.Sqrt(Math.Pow(v.X, 2) + Math.Pow(v.Z, 2)), v.Y); }

        private float turnToFaceO(Vector2 position, Vector2 faceThis, float currentAngle, float turnSpeed)
        {
            float x = faceThis.X - position.X;
            float y = faceThis.Y - position.Y;
            playerOrientation = (float)Math.Atan2(y, x);
            float difference = wrapAngle(playerOrientation - currentAngle);
            difference = MathHelper.Clamp(difference, -turnSpeed, turnSpeed);
            return wrapAngle(currentAngle + difference);
        }

        private float turnToFaceE(Vector2 position, Vector2 faceThis, float currentAngle, float turnSpeed)
        {
            float x = faceThis.X - position.X;
            float y = faceThis.Y - position.Y;
            playerElevation = (float)Math.Atan2(y, x);
            float difference = wrapAngle(playerElevation - currentAngle);
            difference = MathHelper.Clamp(difference, -turnSpeed, turnSpeed);
            return wrapAngle(currentAngle + difference);
        }

        private float wrapAngle(float radians)
        {
            while (radians < -MathHelper.Pi)
                radians += MathHelper.TwoPi;
            while (radians > MathHelper.Pi)
                radians -= MathHelper.TwoPi;
            return radians;
        }

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Re: AS - Artificial Stupidity. Enemy isnt responding correctly...

AS - Artificial Stupidity. Enemy isnt responding correctly...