Collisions and doors

Collisions and doors

<<Backgrounds and lighting

Part 7

In this part we will be covering collisions and doors

Collision mesh needs to be simple anything too complex and the npc's will get stuck, boxes work well for this so lets start with a wall

Before we start we need to move the waypoint inside the lobby because this is where we spawn and after doing the collisions we cant get back in

We can also hide objects in the scene to make this easier

Select the celing and go display > hide > hide selected to unhide do the same display > show > show selected

Now draw a box around the wall it does not have to be perfect because we can edit it

Next hold right click on the box and chose face then align the faces with the wall make sure they cover it

Do the same with all walls and furniture leaving gaps for the doorways

The 2 doorways in the corridor can be covered up with collision because we are not using them but the last one is the exit (which we wont use here anyway so up to you)

Make sure you do not do the floor, roof or tops of doorways

This is because the ai's nav paths use a 2d mask of sorts white is where they can walk and black is where they cant so if you add a collision on the top of a doorway they cant walk across the line

Looking at this collision I missed a bedroom wall

EDIT i forgot to mention how to actually make them collisions sorry bout that

In the scene.ini

rb "ColShape1"
{
  physics
  {
elem[0] {mesh = "ColShape1";}
elem[1] {mesh = "ColShape2";}
elem[2] {mesh = "ColShape3";}

add the required amount of elem as required

Sick of writing out the collisions

elem[121] {mesh = "ColShape122";} yea me too

Floors are done by using

rb "ColShape118"
{
  render {}//render is optional 
 
  physics
  {
    shape_type = GROUND_FULL;
 
    coll_type = NONE;
  }
}

The diffrence is npcs can only walk on GROUND_FULL and if you do have gaps in the floor non GROUND_FULL collisions can create edges that the player will get stuck on

Now onto doors

Doors are easy to make when you get the pivot point right and not half way across the map because then you spend hours screaming and crying because it does not work

So make sure the pivot point for the door is where it would rotate from up and down does not matter

To move the pivot first go select the door and go modify then centre pivot then hold d and move the pivot point

After the pivot is in the right location we need to give it a collision box

So make a box around the door leaving room around the sides and top

Name the collision box something like "FrontDoorColl"

Then in our scene.ini add this in above the collision meshes

rb "FrontDoorShape"
{
  link
  {
    type = REVOL; // Revolving door
 
    axis0 = Y; // Revolving axis
    axis1 = Z; // Opposite axis
 
    Fc = 0.5; // Friction
 
    kd = 0.5; // Damping
 
    Ks = 1; // Spring (so it closes)
    Ls = 0.0; // Spring angle
  }
 
  render {}
 
  physics
  {
 
    elem[0]
    {
      mesh = "FrontDoorCollShape";
    }
  }
 
  interact {} // Can open door by hand
}

And now we need to do one more

Open up pack_tutorial\init\stories\tutorial\scenes tutorial.dat

We need to add this in after the first closing bracket

	door_objecti DOOR1
  {
    q        = 0;
    q_min    = -360;
    q_max    = 360;
    q_spring = 0.1;
 
	  open = true;
 
obj_name = "FrontDoor";
}

This part explains what each one does

door_objecti DOOR1//--- Door object and its own unique name
 
    q        = 0; //---- Where the door will sit at default
    q_min    = -360;//---- How far the door will open one way
    q_max    = 360;//---- How far the door will open the other way 
    q_spring = 0.1;//---- How quickly the door will auto close 0 is none
 
	  open = true;//---- If the door is locked or not false it wont move
 
obj_name = "FrontDoor";//---- First name of the object in the scene and it also must be referenced as an Rb in the scene.ini like we just did

Now save the scene, scene.ini and tutorial.bat Then run the filemaker and see the door ingame

Nice happy swinging door

Next do the same with all the doors except the 2 in the hallway since they don’t open there is no need

If the door only opens part way and kinda wobbles a bit its because the collision boxes are fighting so just move the wall collision a bit back to let the door pass

Part 8 just wet its self a little

>>Adding characters and basic code