3d rotating Mac (still working on it)

[DrChip]

REM Rotating 3d Mac SE
REM iPhone 6+ / iOS 8.2 b3
REM enjoy...
graphics
pi=3.1415
GOSUB setup

loop:
graphics clear 0,0,0
refresh off
snn=snn+5
IF snn>359 THEN
snn=1
END IF
GOSUB rotate
GOSUB draw
GOSUB scroll
refresh on
GOTO loop

rotate:
'rotation
rx=rx+1
IF rx>359 THEN
rx=rx-359
END IF
ry=ry+2
IF ry>359 THEN
ry=ry-359
END IF

' move object
zpos=30+sn(snn)*5

'apply rotation to the vertices
c1=cs(rx)
c2=cs(ry)
s1=sn(rx)
s2=sn(ry)
FOR p=1 TO points
xx=vx(p)
yy=vy(p)
zz=vz(p)
ny=c1*yy+s1*zz
nz=c1*zz-s1*yy
nx=c2*xx+s2*nz
nz=c2*nz-s2*xx
nz=nz+zpos

'add perspective
tx(p)=fov*(nx/nz)+xpos
ty(p)=fov*(ny/nz)+ypos
col(p)=255-nz*6
NEXT p
RETURN

draw:
' draw wire frame
FOR f=1 TO faces
col1=col(vrtx(f,1))
col2=col(vrtx(f,2))
col3=col(vrtx(f,3))
fill COLOR col1/255,col1/255,col1*.7/255

IF f>16 AND f<19 THEN
fill COLOR col1*.7/255,col1*.7/255,col1*.7/255
END IF

fx1=tx(vrtx(f,1))
fx2=tx(vrtx(f,2))
fx3=tx(vrtx(f,3))
fy1=ty(vrtx(f,1))
fy2=ty(vrtx(f,2))
fy3=ty(vrtx(f,3))
IF (fx1-fx2)*(fy3-fy2)-(fx3-fx2)*(fy1-fy2)<0 THEN
'TRIANGLE fx1,fy1, fx2,fy2, fx3,fy3
trix(0)=fx1
triy(0)=fy1
trix(1)=fx2
triy(1)=fy2
trix(2)=fx3
triy(2)=fy3
fill poly trix,triy count 3
END IF
NEXT f
RETURN

scroll:

'move letters
sx=sx-5
IF sx<0 THEN
ll=len(l$)
FOR l=0 TO 65
letter$(l)=letter$(l+1)
NEXT l
letter$(65)=substr$(scroll$,0,1)
o=o+1
IF o>LEN(scroll$) THEN
o=0
END IF
sx=1
END IF

' display scroll
draw COLOR 1,1,0
lx=sx
FOR l=1 TO 65
ly=sinus(lx+10)
DRAW TEXT letter$(l) at lx,ly
lx=lx+10
NEXT l
RETURN

setup:
'setup variables
points=30
faces=56
xpos=Screen_Width()/2
ypos=Screen_Height()/2
zpos=30
fov=700

'dimension arrays
DIM vx(points+1),vy(points+1),vz(points+1)
DIM tx(points+1),ty(points+1)
DIM vrtx(faces+1,4),col(points+2)
DIM sn(360),cs(360)
DIM letter$(67),sinus(656)
DIM trix(4),triy(4)

' setup vertices
FOR p=1 TO points
READ vx(p),vy(p),vz(p)
NEXT p

FOR f=1 TO faces
READ vrtx(f,1),vrtx(f,2),vrtx(f,3)
NEXT f

' setup sin/cos-LUT
FOR a=1 TO 359
sn(a)=SIN(a*PI/180)
cs(a)=COS(a*PI/180)
NEXT a
'setup scroll text
scroll$="PLAY > "
scroll$=scroll$&"Hello everyone! This is DrChip "
scroll$=scroll$&"here with a classic 3D-model "
scroll$=scroll$&"of a Macintosh SE. I didn't do "
scroll$=scroll$&"any proper z-sorting 'cause I'm a lazy bum. "
scroll$=scroll$&"There are no major overlaps anyway, and the "
scroll$=scroll$&"sorting would have caused serious speed issues"
scroll$=scroll$&". I think it's slow enough as it is, and it's "
scroll$=scroll$&"this scroll that slows it down... anyways.."
scroll$=scroll$&" Greetings to everyone on this"
scroll$=scroll$&" basic forum.... "
scroll$=scroll$&"enjoy this 3D-business..."
scroll$=scroll$&" << REWIND"
scroll$=scroll$&" "

'setup SIN table FOR scroll
FOR x=1 TO 650
sinus(x)=(Screen_Height()-25)+SIN(x/20)*10 '500
NEXT x

' setup scroll start
FOR l=1 TO 65
letter$(l)=" "
NEXT l
RETURN

' vertex coord data
DATA -5,-6,-5
REM front (1,2,3,4)
DATA 5,-6,-5
REM ---------------
DATA 5, 4,-5.5
DATA -5, 4,-5.5
DATA -5, 4,-4
REM front/bottom (5,6,7,8)
DATA 5, 4,-4
REM ----------------------
DATA 5, 7,-4
DATA -5, 7,-4
DATA -5,-4, 5
REM back (9,10,11,12)
DATA 5,-4, 5
REM -----------------
DATA 5, 7, 5.2
DATA -5, 7, 5.2
DATA -5,-5.5, 4
REM back/top (13,14,15)
DATA -2,-5.5, 4
REM ----------
DATA -2,-4, 5
DATA 5,-5.5, 4
REM back/top (16,17,18)
DATA 2,-5.5, 4
REM -------------------
DATA 2,-4, 5
DATA -2,-5.8, 0
REM back/top indent(19,20,21,22)
DATA 2,-5.8, 0
REM ----------------------------
DATA 2,-4, 0
DATA -2,-4, 0
DATA -4,-5,-5
REM screen frame (23,24,25,26)
DATA 4,-5,-5
REM --------------------------
DATA 4, 1,-5.3
DATA -4, 1,-5.3
DATA -3.5,-4.5,-4.5
REM screen surface (27,28,29,30)
DATA 3.5,-4.5,-4.5
REM ----------------------------
DATA 3.5, .5,-4.5
DATA -3.5, .5,-4.5

' face connection data
DATA 20,19,22
REM back/top faces
DATA 22,21,20
REM ----------
DATA 17,20,21
DATA 21,18,17
DATA 19,14,15
DATA 15,22,19
DATA 21,22,15
DATA 15,18,21
DATA 23,24,28
REM screen faces
DATA 28,27,23
REM ------------
DATA 28,24,25
DATA 25,29,28
DATA 30,29,25
DATA 25,26,30
DATA 23,27,30
DATA 30,26,23
DATA 27,28,29
DATA 29,30,27
DATA 4,3,6
REM front/bottom
DATA 6,5,4
REM -----------
DATA 5,6,7
DATA 7,8,5
DATA 1,2,24
REM front faces
DATA 24,23,1
REM -----------
DATA 24,2,3
DATA 3,25,24
DATA 26,25,3
DATA 3,4,26
DATA 1,23,26
DATA 26,4,1
DATA 19,20,2
REM top faces
DATA 2,1,19
REM ---------
DATA 13,14,19
DATA 19,1,13
DATA 17,16,2
DATA 2,20,17
DATA 16,17,18
REM back faces
DATA 18,10,16
REM ----------
DATA 14,13,9
DATA 9,15,14
DATA 10,18,11
DATA 18,15,11
DATA 15,12,11
DATA 15,9,12
DATA 13,1,4
REM left faces
DATA 4,5,13
REM ----------
DATA 9,13,5
DATA 12,5,8
DATA 5,12,9
DATA 2,16,3
REM right faces
DATA 16,10,3
REM -----------
DATA 3,10,6
DATA 6,10,11
DATA 6,11,7
DATA 8,7,11
REM bottom faces
DATA 11,12,8