In this lesson we will glue the camera to the "avatar".

First thing: we build an object (we call it aux) and glue the camera to it. It's created using:

aux.myworld.new model("aux")

We make it invisible:

aux.visibility = #none

It's important to note that we are talking about "avatar" but our world is not multiplayer and doesn't exist an avatar : only a camera.

To make the glues we use a Director method:

obj1.interpolate(obj2.getworldtransform(),lag)

This method moves a model (obj1) from its current position to the position of another object (obj2). lag is the time to move. If we use lag=100 the obj1 seems to be strongly glued. If we use lag=10 this gives a fluity to the movement of the camera.

We make the avatar invisible too.

In the new world of this lesson, the graphic part is similar and the script setupscript is the same of the previous lesson.

The difference in the script avatarobj is a line to make the "avatar" invisible:

myworld.model("avatar").visibility = #none 

The script of the loop runs a new part of the script cameraobj:

on prepareframe me
  global avatarobj, cameraobj 
  
  control avatarobj
  control cameraobj
end

on exitFrame me
  go the frame
end 

And the script cameraobj has many new lines:

property mycam   
property aux  
property cameraoffset  

global avatarobj,myworld

on new me
  aux = myworld.newmodel("aux")
  mycam = myworld.camera[1]
  
  aux.visibility = #none
  mycam.projectionangle = 65 
  cameraoffset = [5,-50]
   
  return me  
end


on control me 
   
  aux.transform.interpolateto(myworld.model("avatar").getworldtransform(), 100)
  camvect = (avatarobj.upvect*cameraoffset[1]+   avatarobj.fwvect*cameraoffset[2])
  aux.translate(camvect, #world)
  
   
  aux.pointat(myworld.model("avatar").worldposition ) 
  lag = 100
   mycam.transform.interpolateto(aux.getworldtransform(), lag)  
end

Save, publish etc. etc. You can play the demo using the arrow keys.

The height (defined by cameraoffset = [5,-50]) and velocity of avatar/camera can be changed.

But we have two big problems. Walking, if you go throught the plaque with the logo, the avatar is like a ghost: he doesn't collide!. The second problem is that: if you try to go up stairs the avatar doesn't go up! He doesn't follow the "terrain". We will see how to fix this in next lessons.

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