Sorry about the delay in responding, because I was studying the matter. Ok, now I know the process of creating a 3D mesh and how work the UV Mapping in the mesh. Thank you!

What I am now in doubt is the command "mouse_pos3d". I did many attempts but could not. I searched the forum but did not find anything like what I needed. Below a picture of animation frames of what needed:



I wanted to create a mesh from a region of a scene, where the 3D positions are relative to mouse, and an axle is fixed in the grid. The code below is almost what I want:


Code:
function shoot_with_mouse() 
{  
  VECTOR to;
  vec_set(to,mouse_dir3d);
  vec_scale(to,1000); // set a range
  vec_add(to,mouse_pos3d);
  c_trace(mouse_pos3d,to,ACTIVATE_SHOOT);
}


Can anyone help me?

Thanks