the z coordinate

[cassius]

This is a question I probably should have asked right at the start of my 3d aspirations.

I need to get some bullets fired from a gun in my game so am I right in supposing that the z coord is the one thats always in front of the camera?

[AndyGFX]

Strictly speaking - each object when is rotated, translated, ... , has oriented toward Z axis vector.

For example TurnEntity(e,Vec3(0,0,1)) - move entity in Z axis direction.

Camera works same. Your look direction is Z axis direction, oriented by actual camera/entity rotation.

[cassius]

I see . So if I move a bullet in the z direction it will always go where the gun is pointing ?

 

Also do I actualy need a bullet? Is there some other way?

[Joh]

Not exactly.. You need to find local position of gun before.

Check this link http://leadwerks.com/werkspace/index.php?/topic/1620-solved-placing-objects-in-front-of-you/

I know that's lua but the code is really similar.

[cassius]

Thanks for replies. I am surprised there hasn't been more interest in this subject considering the number of people who use a gun in their game.

I would like to see some code either in c or Bmax. A demo of a firing gun.

[Joh]

Well isn't harder then this:

 

//This is where we set the position
TVec3 V = TFormVector( Vec3(0,0,1), gun, null );
V= Vec3(EntityPosition(gun).x +V.x,EntityPosition(gun).y +V.y,EntityPosition(gun).z +V.z);

 

Now you should only point to the currect direction and translate.

[Marleys Ghost]

What sort of "bullet"? an actual entity or just a picked point and add force ? I am actually in the middle of converting/updating a test project I did last year in C++.

 

 

Original thread here.

 

 

Here the bullets are picks then adding a force at that point.

[Joh]

You used reaycast and then addforceatpoint right?

Strangly when you "disabled" the gravity the already sleeping physics body wasn't effected.. I think you'll need to loop into all those body to reactive them. Am i right?

[Marleys Ghost]

Strangly when you "disabled" the gravity the already sleeping physics body wasn't effected

 

Newton's laws of motion ... a body at rest and all that .. plus the Zero G just made the demo download on the old thread that more much fun to play with

[Marleys Ghost]

Strangly when you "disabled" the gravity the already sleeping physics body wasn't effected.. I think you'll need to loop into all those body to reactive them. Am i right?

 

 

yeah, simply loop through the scene and "jiggle" them to wake 'em up. I'll modify later the simple turning off of the worlds gravity and give it the "hollywood()" treatment when I get 5 mins and post the result ..

 

 

@ cassius : how are you getting on with your bullets?

[Joh]

Nice i like those effect

In past i worked on a "gravity granade" wich was quite funny..

[Marleys Ghost]

A quick test of waking up entity physics bodies when turning off the gravity of a world. Went a bit over the top with the number of test barrels for such a simple test. 144 was I think overkill.

 

[Joh]

Nice!

But i think we are a little out of topic

If you create your own topic i will write there.

[Marleys Ghost]

I'm just killing time waiting on cassius lol

[cassius]

Firing bulletets in the required direction is my only prob in this thing. I got the gun set in position and sound effect. I suppose you could use an entity of a bullet and make it invisible, you could also have crosshairs and use that as a target.

[Marleys Ghost]

well unless you really need the end of the gun to be the point of origin use the camera as the origin and pick a Z distance to the centre of the screen, when the pick hits an entity addforce at that point. No need for invisible bullets, angle the gun model if thats what you are using toward the screen centre for effect.