c# - Converting FPS ground camera to FPS free flying camera -

i have implemented camera in opengl(opentk) project

      //move(0f, 0.1f, 0f); }    forward       //move(-0.1f, 0f, 0f); }   left       //move(0f, -0.1f, 0f); }         //move(0.1f, 0f, 0f); }    right       //move(0f, 0f, 0.1f); }          //move(0f, 0f, -0.1f); }   down     public static void move(float x, float y, float z)     {           vector3 offset = new vector3();         vector3 forward = new vector3((float)math.sin((float)orientation.x), 0, (float)math.cos((float)orientation.x));         vector3 right = new vector3(-forward.z,0,forward.x);         offset += x * right;         offset += y * forward;         offset.y += z;         offset.normalizefast();         offset = vector3.multiply(offset, movespeed);         position += offset;     } 

where "orientation" x,y of direction camera facing. "position" position of camera in world, , "movespeed" float.

this camera works great. ground based. mean x value of camera orientation affects movement direction. y value not. want make free flying camera if , press forward camera fly air.

i tried changing forward declation to:

vector3 forward = new vector3((float)math.sin((float)orientation.x), (float)math.sin((float)orientation.y), (float)math.cos((float)orientation.x)); 

this partially works, camera can fly air. not right, camera moving same forward amount no matter how far "up" tilt it. not replacing of forward, being added onto it.

i hope explanation makes sense.

thanks

you can this: first forward vector orientation (you can use camera.lookat well)

public vector3 getforward(vector2 orientation) {       vector3 forward = new vector3(0, 1, 0);     //x axis rotation     forward.z = (float)math.sin((float)orientation.y);     forward.y = (float)math.cos((float)orientation.y);     //z axis rotation     forward.x = forward.y*(float)math.sin((float)orientation.x);     forward.y = forward.y*(float)math.cos((float)orientation.x);      return forward; } 

and move camera with:

public void move(float horizontal, float strafe) {       vector3 forward=getforward(orientation);     //forward vector projected on xoy plane , rotated 90 degrees     vector3 leftxoy = new vector3(-forward.y ,forward.x,0);      vector3 movedirection = vector3.multiply(forward,horizontal)+vector3.multiply(leftxoy,strafe);     movedirection.normalize();      position += vector3.multiply(movedirection,movespeed); } 

so if call move(1,-1); move camera forward (along forward vector) , strafe right.