Finding a point relative to the x, y, and z angle?

I’m having some difficulty in my game, http://www.yoyogames.com/games/show/87836 . I can’t figure out how to shoot,find a point,from a particular part off the plane. If you look at my game you will see that I can rotate my plane in all 3 dimensions; x,y,and z. I’m wonting to be able to shoot from the wings, but the x, y, and z of the bullet is always changing do to the angle of my plane. If I were to do this in 2D it would look like this.

Code:

bulletx=x-sin(+degtorad(-direction))*(31)
bullety=y+cos(-degtorad(-direction))*(31)


But in 3d I have z

Code:

bulletx=x+???
bullety=y+???
bulletz=z+???


its not as simple as adding the third dimension

Code:

bulletx=x-sin(+degtorad(-direction))*(31)
bullety=y+cos(-degtorad(-direction))*(31)
bulletz=z-cos(+degtorad(-z_direction))*(31)


move to the code databse section

"code databse" but this is a 3d question and "code databse" is for posting code

gogame1315 wrote:"code databse" but this is a 3d question and "code databse" is for posting code

You are right, but you should add the bit of 2d code that you said you knew to the code database. I personally have no knowledge of 3d gamemaking, sorry.

oh sorry.

-js1210- wrote:

gogame1315 wrote:"code databse" but this is a 3d question and "code databse" is for posting code

You are right, but you should add the bit of 2d code that you said you knew to the code database. I personally have no knowledge of 3d gamemaking, sorry.

That little bit of 2d code was just to try and explain what I wonted in 3d (it was a 2d version of what I wonted in 3d) can I keep it ?

Oh good.
So I don’t have to edit my post.

um...Yeah you can keep this topic the same as it is now. There are several people here that know about 3d. You might get an answer in a day or two.

Good thank

If you ONLY want to rotate a point along ONE axis but around TWO rotations, you can do this:

X = x + cos(pi/180*direction)*cos(pi/180*zdirection);
Y = y + sin(pi/180*direction)*cos(pi/180*zdirection);
Z = z + sin(pi/180*zdirection);

This ONLY works when you wish to rotate point (0, 0, 1) around(direction, zdirection). If you want to rotate the point (, , ) around (xrot, yrot, zrot), you must learn matrixes and vectors, which I can't teach you. You should learn U3D for these, as it's really simple there.

EDIT:
To make the bullets come from the wings, it's still possible, but it's not going to be easy. I suggest you take a look at U3D for these functions, if you haven't already gotten too far with your game. You must re-do most of the game if you wish to switch, but it's worth it.

Woah.

Wow ! what is U3D, is it a DLL for 3d ?

YAY.........!! It works! I have spent hours on this! how ever did you figure it out ? thanks Hepolite !

Yeah, U3D is a 3D rendering DLL for GM. It also has some mathematical functions, such as matirxes and vectors.

Believe me, it took a a long time to understand this. I had no background knowlegde of trignometry before I came up with that, so it wasn't easy.

No problems, by the way

lol. I’m in grade 7 so I don’t even know the functions cos, sin, and tan (not that I don’t use them ) what grade do they teach trig, I need to know it.

gogame1315 wrote:lol. I’m in grade 7 so I don’t even know the functions cos, sin, and tan (not that I don’t use them ) what grade do they teach trig, I need to know it.

Senior in High School

-js1210- wrote:

gogame1315 wrote:lol. I’m in grade 7 so I don’t even know the functions cos, sin, and tan (not that I don’t use them ) what grade do they teach trig, I need to know it.

Senior in High School

NOOOOooo..... ! ! are you telling me the truth ?

I learned this fully out when I started at college (1st year), but I started to learn about these myself while in high school (2nd year) (I don't know if I got the school terms correct, not a native English speaker).

I don't know how you school system works, but you may not learn about this until college. You should research this on Wikipedia if you want to learn about sine, cosine and tangent.

I know cos(ine) not much else, and trig.

Hepolite wrote:I learned this fully out when I started at college (1st year), but I started to learn about these myself while in high school (2nd year) (I don't know if I got the school terms correct).

I don't know how you school system works, but you may not learn about this until college. You should research this on Wikipedia if you want to learn about sine, cosine and tangent.

good idea

ok

it's almost that simple.
it looks like you have 2 angles. i think this will create a bullet in front of your plane.
i had a topic about vectors. i can't find it. this site has too many sub levels.

Code:

var dx,dy,dz,m;

dx=-sin(degtorad(-direction))*(31);
dy=cos(degtorad(-direction))*(31);
dz=-tan(degtorad(-z_direction))*(31);

m=sqrt(sqr(dx)+sqr(dy)+sqr(dz));

dx/=m;
dy/=m;
dz/=m;

with(instance_create(0,0,obj_bullet))
{
    x=other.x+dx;
    y=other.y+dy;
    z=other.z+dz;
}

thanks "slayer64" I looked for your topic and found it https://gameml.forumotion.com/gamemaker-techniques-f32/why-use-vectors-t233.htm