I don't think it's possible to control a mesh. Unless, of course, you mean an
object. Those you CAN control. To load your own custom object, use the LOAD OBJECT command. Here's some simple code showing how you might move an object around. I used a cube, but you can load in your own object if you like. I'll leave it to you to implement the 3rd person camera
. Have a look at TDK's tutorial on
Set Camera To Follow for help with that.
The reason why in the following example I don't use TURN OBJECT LEFT and TURN OBJECT RIGHT is because the SET CAMERA TO FOLLOW command doesn't seem to like those two commands.
rem Setup
Sync On
Sync Rate 60
rem Make a grid
Make Matrix 1,1000,1000,30,30
rem Make a cube
Make Object Cube 1,10
Do
rem Move the object forwards with the up arrow key
if upkey() then move object 1,2
rem Move the object backwards with the down arrow key
if downkey() then move object 1,-2
rem Turn the object right with the right arrow key
if rightkey() then yrotate object 1,wrapvalue( object angle y(1)+2)
rem Turn the object left with the left arrow key
if leftkey() then yrotate object 1,wrapvalue( object angle y(1)-2)
Sync
Loop
Good luck