Hi,

I try that when I click (left mouse button) ,at that position a earth entity
Will be create. I make function for this and call it in main ().But it can’t work.
Why?Please help.
Here is my code.

ENTITY* earth;
var a;
var b;
var c;
function main()
{
level_load("ent_.wmb");
wait(2);
mouse_mode = 2;
creat();
while(1)
{
mouse_pos.x = mouse_cursor.x;
mouse_pos.y = mouse_cursor.y;
wait (1);
}

}
function creat()
{
if (event_type == EVENT_CLICK)
{
while (mouse_left)
{
a = mouse_pos.x; // follow mouse x-pos
b = mouse_pos.y; // follow mouse y-pos
c = camera.z; // same as camera z-pos
earth = ent_create("earth.mdl",vector(a,b,camera.z), NULL);
wait(1);
}
}

}

First of all, event triggers such as EVENT_CLICK are used for clicking on entities and stuff, not for mouseclicking in general. So upon calling the function creat(), the engine will never read the part within the if statement.

Second, you want to create an entity when you click the mouse, but your while statement will never be executed when you don't click the mouse first, and thus never wait for your input.

Third, when you create a view model, you should use ent_createlayer (I assume you want a view entity instead of a world entity as you define an entity as ENTITY*). Plus you place your model directly on the camera.z axis, you wont see it as your camera is now in the model.


So, time for the solution:
Code:

---

function main()
{
  level_load("ent_.wmb");
  wait(2);

  creat();

  mouse_mode = 2;
  while(1)
  {
    mouse_pos.x = mouse_cursor.x;
    mouse_pos.y = mouse_cursor.y;
    wait (1);
  }
}

function creat()
{
  while (1) //we will always check for user input, every frame
  {
    if (mouse_left) //left mouse has clicked!
    {
      you = ent_create("earth.mdl", 0, 10); //create earth.mdl view entity, no flags, on layer 10
      you.x = mouse_pos.x;
      you.y = mouse_pos.y;
      you.z = 40; //40 quants in front of the camera
    }
    wait(1);
  }
}

---

If you wanted a world entity instead, you need some more code for letting it follow the mouse. I'll help you on it if this is the case.

Ciao

Thank you for your co-operation.

I get error when i click on screen at runtime.
That is : Crash in creat : you=ent_create(@4,0,10)
Why ?

When i change layer 10 to NULL(you = ent_create("earth.mdl",0, NULL);)
than error gone entity creat but not excecty match mouse position.
It is just overlaping in one layer horizontaly.
Sorry i cant understand your third point properly.

please help.
Thanks

Well I made a little mistake. I wrote ent_create in my code instead of ent_createlayer. Ent_create makes an entity in the world, where the player walks too. Ent_createlayer makes an entity on the camera view. Thus independent of where the player walks and rotates, it's position will always be in the screen.

Seen that you did not know what I was talking about, I think you want the first option . My apologies, for I have not tested the code. I just blindly trust on my superb programming skills . So here an improved code:

Code:

---

function main()
{
  level_load("ent_.wmb");
  wait(2);

  creat();

  mouse_mode = 2;
  while(1)
  {
    mouse_pos.x = mouse_cursor.x;
    mouse_pos.y = mouse_cursor.y;
    wait (1);
  }
}



function mouseTo3D() {
  while (1) {
    if (mouse_left) {
    vec_set (mouse_click, mouse_dir3d); //get direction vector from mouse to world
    vec_normalize(mouse_click, 4000); //give it a large distance for tracing
    vec_add (mouse_click, camera.x); //calculate from camera position

    c_trace (camera.x, mouse_click, IGNORE_MODELS); //trace from camera to clicked position (= mouse position + 4000 in depth)

    return(target.x); //we return the new 3d vector for further use
    }
  wait(1)
  }
}



function follow_mouse() {
  while (me) {
    vec_set(you.x, mouseTo3D());
    wait(1);
  }
}



function creat()
{
  while (1) //we will always check for user input, every frame
  {
    if (mouse_left) //left mouse has clicked!
    {
      you = ent_create("earth.mdl", nullvector, follow_mouse); //create earth.mdl and let it follow the mouse
    }
    wait(1);
  }
}

---

Thanx for your kind co-opration.

I have error :
mouse_click--unknown parameter.
can i change mouse_click to temp ?

vec_set(you.x, mouseTo3D());--syntex error-vector expected.

My mistake (again), replace the mouseTo3D() with the following code:
Code:

---

var mouse_click[3];

function mouseTo3D() {
    vec_set (mouse_click, mouse_dir3d); //get direction vector from mouse to world
    vec_normalize(mouse_click, 4000); //give it a large distance for tracing
    vec_add (mouse_click, camera.x); //calculate from camera position

    c_trace (camera.x, mouse_click, IGNORE_MODELS); //trace from camera to clicked position (= mouse position + 4000 in depth)

    return(target); //we return the new 3d vector for further use
}

---

And if you would click the left mouse now, alot of entities are created. To prevent that, replace and type:
Code:

---

    if (mouse_left) //left mouse has clicked!
    {
      you = ent_create("earth.mdl", nullvector, follow_mouse); //create earth.mdl and let it follow the mouse
      while (mouse_left) {wait(1);}
    }

---

Thank you Sir.

still i have one error.
vec_set(earth.x, mouseTo3D());-syntex error-vector expected.
we return the new 3d vector from function mouseTo3D() then
why we use function in vec_set instead of return value ?

please help

Myabe it's return(target.x); instead of return(target);

We need to copy the returned vector to earth.x, that is what vec_set does. You cant just copy a vector to anyother by using earth.x=mouseTo3D(), because that's for single values, not for arrays (which is what a vector is, var vector[3]).

Thank you Sir,

I can not copy that value in mousefollow function.
Here my try:
function follow_mouse()
{
vect=mouseTo3D();
while (me)
{
vec_set(earth.x,vect);
wait(1);
}
}
It gives me empty pointer error.
What should i do ?
Please help

Can you post all your code and variable declarations relevant to this function? How did you declare 'vect'?