lturek Jan 11, 2011 at 2:15 PM Hi guys! I am a beginner to Farseer Physics, but I have already managed to do some basic stuff.  Right now I am trying to build a shooter, for better understanding let's say I am trying to build asteroids . I have set world gravity to (0,0), the player can fly around and face the direction he wants, the fire key creates a new Bullet-fixture with the  same position and rotation as the player. Bullet looks like this ``` class Bullet : FixtureSpriteComponent { public Bullet(World world) : base("Bullet") { Sprite = new Sprite("images\\bullet"); Fixture = FixtureFactory.CreateRectangle(world, Sprite.Width, Sprite.Height, 1f); Fixture.Body.FixedRotation = true; Fixture.Body.BodyType = BodyType.Dynamic; Fixture.CollisionFilter.CollisionCategories = Category.Cat2; Fixture.CollisionFilter.CollidesWith = ~Category.Cat1; Fixture.Body.IsBullet = true; } public override void Update() { Fixture.Body.LinearVelocity = Geometry.Radians2Direction(Fixture.Body.Rotation) * 100; base.Update(); } } ``` In the Update Method the Body of the Bullet should be forced to fly straight ahead, which it does, but very slow (for a bullet). I have already tried to change some values here and there but it didn't make any difference. I hope you could give me a hint : ( Thank you! Genbox Coordinator Jan 11, 2011 at 3:38 PM You are using the rotation as the linear velocity? perhaps you should base the speed of the bullet on something else like a fixed speed. Have you scaled your world to be in meters instead of pixels? lturek Jan 11, 2011 at 4:29 PM Thanks for reply! Nono, thats not the rotation, its a Method that converts the angle (rotation) of the bullet to a small Vector2D - multiplied by a certain value should move the bullet forward. Sorry for that question but where can I scale the world? x.x cannot find anything like that.. Genbox Coordinator Jan 11, 2011 at 4:41 PM I misread the name of the method. You need to scale your units from pixels to meters in order for FPE to do it's work correctly. I recommend you search the forums on how to scale or take a look at the samples. Try changing the Settings.MaxTranslation variable to a higher value. If your bullet moves faster, then you should probably scale your units to between 0.1 and 10 meters. lturek Jan 12, 2011 at 11:13 AM Thank you so much Genbox, i have made some pixel2meter and meter2pixel conversions to meet the 0.1to10m requirement, adjusted the camera a bit and everything looks good!