That 3d thing

[Marcus]

Here's a zip with the fourth tutorial step included. It's about static billboard sprites.

Question on Example 4
By the way, you may reply when you are free, it's not urgent 


click the image to zoom-in

Please zoom-in the attached image :
1. On the EngineA Map Editor, I repositioned the player to (4,15).
    When I  ran the code, the player was facing the south wall.
    How to make him facing to the north room ?

2. What function should I write on the code editor so that I can display player's information :
    a. player's coordinates / position (x,y,z)
    b. player's angle (in degree/radian) so that I can turn him to face the north room. 

Thank you.

The coordinate system in the engine and s3d is a bit wonky. The z axis points into the screen, the x axis right and the y axis down. In the editor's top down view, on the other hand, the x axis points right and the z axis down. That's why a map seems mirrored when you walk through it in a game.

You can use player.SetYaw(radians) to change the player's direction in the xz plane. At the angle 0 radians, which is default, the player is looking down (in the editor's top down view). This is because I use sin(angle) (0) for the x direction and cos(angle) (1) for the z direction. So to make the player look up (in the editor's coordinate system ...), use player.SetYaw(rad(180)) or player.SetYaw(PI). You could even set the starting angle as "value" in the "player" flag (more about that when we look at enemies, which comes next).


You can read the player's position using the X, Y and Z functions. In your Draw function:

Code:

set caret 0, 0
wln "Position: " + player.X() + ", " + player.Y() + ", " + player.Z()

You have to declare the player variable visible for that to work.

I should have decided to let the x axis in the editor represent the 3d z axis and the y axis be the 3d x axis. Then the map wouldn't appear as mirrored when you walk through it. Maybe I will make that change at some point ...