Bonjour je suis nouveau sur le site et j'essaie de créer un nouveau rpg en 3d avec un moteur raycasting.
Les menus sont quasiment terminés.
J'aimerai de l'aide pour le moteur raycasting

voici le code source

Hello I am new to the site and I try to create a new RPG with 3D ray casting engine.
The menus are almost completed.
I'd like to help with the ray casting engine

here's the source code

. Full3d
[1111111111111111->GDB1  //test map
[1000000000000001
[1999100000000001
[1888100000000001
[1777400000000001
[1888101199100001
[1999101199100001
[1999101199100001
[1999100100100001
[1555100100110001
[1111100100010001
[1111111111111111

E0->S
E500->X->Y
Diagnosticoff
Repeat getkey(15)
Repeat getkey(0)
Pause 11
Disgraph'
End
Disgraph'Clrdraw''
getkey(2)-getkey(3)*8+S->S
sin()->Q
cos(S)->P
If getkey(4)+getkey(1)
If getkey(1)
-P->P   // negative symbole (not operator)
-Q->Q   //  the same
End
!If Check(X+P,Y-Q)->U*(U<4)
X+P->P
Y-Q->Q
End
End
E3->A
cos(-45)->L  // negative symbole
S+45->S
While -S+45  //operator
cos(Z)->I
sin(Z)->J
E0->C-32->G  //oper.
X->P
Y->Q
EF->K
Ray()
A+2->A
cos(-48)->L  //operator
Z-2->Z
End
End
Return

Lbl Check
nib{/256*156+{°r1+1}+(GDB1*2)}
Return

Lbl Draw
!If H-r2-G->r2<<0
Rect(A,G+32,2,r2,r1)
End
Return

Lbl Ray
P+I->P
Q-J->Q
If Check(P,Q)->§*(K>=§)
180/(L*C/256+8)->H*§/5->W
G+H>256?-H->G  // negative signe
If Check(P,Q+J)->V+§-2*V
Draw(L6,V*H/5
End
V-§?Draw(L3,W),Draw(L6,W
Return!If §->K-1
G+r2->G
End
ReturnIf C++>50
Goto Ray

Need optimization
(6 MHz)

->  is sto symbole

§  is theta

it isn't only french, and more people will see it here.
what past experience do you have?
basically, the idea in raycasting is that your character moves around on a 2d plane with walls and things, and a pseudo-3d projection of that area is made by casting rays out from the character's position in the direction he's looking, one for each column of pixels, measuring the distance to the nearest wall using trigonometry, and drawing walls either taller or shorter, depending on their distance away from the viewing point. what all do you need help with?

EDIT: this is a really helpful tutorial.

dda?
is this what you mean?
http://read.pudn.com/downloads76/sourcecode/embed/279654/Digital%20Differential%20Analyzer%20for%20Lines.pdf

as in, the closest point to the viewer?
well, you literally "cast rays" at them. check points at intervals along a line pointing out away from your viewing point and stop when one of those points is inside a wall.
so if your map is broken up into blocks of 8*8 blocks, you would have to get the truncated integer value of the point's cartesian (x, y) coordinates in order to find what block it's inside, and then check that block on the map to see if it's inside a wall.

Ok......  I will try this 

I also forgot to say that the walls have a variable height and you're done making the program a little more complicated
Here, I have a variable height from the top, but not the bottom ....
And I did not succeeded to put the two together ... :'(

Furthermore, and this time the game, I'll try to put a program on the site to show you a costume of a character team.

Errrr ......
I can't find the link to post a program

 Ok. Thank you !!

The raycasting isn't so complicated.
I had good results with my ray casting engine, although there is no textures (which is not that bad). 
I think I will reduce the quality to increase speed: the whole is to find a good arrangement 

Otherwise I start to create an artificial intelligence (it's just a point following a other point) and I do not see too how to make the point that moves avoids the walls

Here the code

.IA
20->C->D->X->Y
New()

Repeat getkey(15)
X-C<<0?-1->I,1->I  // -1 is the signe
Y-D<<0?-1->J,1->J  //same
Y-D=0?0->J
X-C=0?0->I
X-C//32+I->S
Y-D//32+J->T
!If pxl-test(C+S,D+T
C+S->C
D+T->D
End
pxl-on(C,D
pxl-on(X,Y
If C=X*(D=Y
New()
End
Disgraph
Pause 300
Clrdraw
End
Return

Lbl New
rand^20+3->A
!If rand^2-1
-A->A   // the signe
End
rand^20+3->B
!If rand^2-1
-B->B  //same as follow
End
!If pxl-test(X+A,Y-B
A+X<64*(A+X>0)?X+A->X
B+Y<64*(B+Y>0)?B+Y->Y
Else
Goto New
End

Basically, this code just create a point, which is the objective of the other point

(here it stops when it hits a wall, and I want that the point continues to try to reach the other point ...)
Thank for help! 

Thank you.
I think I find a way to do a limited and quick AI
So, I will try this and I wil tell you if it's work. 

Also a picture showing the possibilities of my engine

Better on calc !!!

I'm just working on a playable demo so I'll post you when I had finished

Feature:
Character animation ..... in progress   
Cool menus ....... almost done   
3d   
find the treasure   
Boss ...... with animations (and everything in 3d)
Save game  ....done (and  very funny)