Trying to understand glib, or make a 3D engine myself. Either way, I am stuck at the part with backface culling. I would like just a simple code that someone else had made, just a rotating cube, but I would like to learn for myself too. Anyway.
I can't figure out how to calculate the normal vector when given 4 points on the face of the cube. Here's the code I have now to just display 8 vertices:
Code:
I'm also not good at optimizing stuff, so if anyone can give some hints for the optimizing too...
Edit: Btw, this is for Axe
I can't figure out how to calculate the normal vector when given 4 points on the face of the cube. Here's the code I have now to just display 8 vertices:
Code:
L1->^^oXCAM+2->^^oYCAM+2->^^oZCAM+2->^^oXANG+2->^^oYANG+2->^^oZANG+2->^^oXSIN+2->^^oYSIN+2->^^oZSIN+2->^^oXCOS+2->^^oYCOS+2->^^oZCOS+2->^^oXXROT+2->^^oYXROT+2->^^oZXROT+2->^^oXYROT+2->^^oYYROT+2->^^oZYROT+2->^^oXZROT+2->^^oYZROT+2->^^oZZROT+2
0->XCAM->YCAM
~48->ZCAM
0->XANG->YANG->ZANG
Repeat getKey(15)
sin(XANG)->XSIN
cos(XANG)->XCOS
sin(YANG)->YSIN
cos(YANG)->YCOS
sin(ZANG)->ZSIN
cos(ZANG)->ZCOS
ZCOS*YCOS//128->XXROT
ZCOS*YSIN//128*XSIN-(ZSIN*XCOS)//128->YXROT
ZCOS*YSIN//128*XCOS+(ZSIN*XSIN)//128->ZXROT
ZSIN*YCOS//128->XYROT
ZSIN*YSIN//128*XSIN+(ZCOS*XCOS)//128->YYROT
ZSIN*YSIN//128*XCOS-(ZCOS*XSIN)//128->ZYROT
~YSIN->XZROT
YCOS*XSIN//128->YZROT
YCOS*XCOS//128->ZZROT
.Lbl CODE
For(A,0,7)
A*6+GDB0->[r1]
{[r1]}^^r->S->X
{[r1]+2}^^r->T->Y
{[r1]+4}^^r->U->Z
XXROT*X+(YXROT*Y)+(ZXROT*Z)//128->S
XYROT*X+(YYROT*Y)+(ZYROT*Z)//128->T
XZROT*X+(YZROT*Y)+(ZZROT*Z)//128->U
U-ZCAM->Z
S-XCAM*64//Z+48->X
T-YCAM*64//Z+32->Y
Pt-On(X,Y,[2424240081423C00])
End
.Lbl MOVE
getKey(26)-getKey(28)*4+XANG->XANG
getKey(35)-getKey(19)*4+YANG->YANG
getKey(20)-getKey(34)*4+ZANG->ZANG
getKey(3)-getKey(2)*2+XCAM->XCAM
getKey(1)-getKey(4)*2+YCAM->YCAM
getKey(54)-getKey(48)*2+ZCAM->ZCAM
DispGraphClrDraw
End
Return
Data(~10^^r,~10^^r,~10^^r)->GDB0
Data(~10^^r,~10^^r,10^^r)
Data(~10^^r,10^^r,~10^^r)
Data(~10^^r,10^^r,10^^r)
Data(10^^r,~10^^r,~10^^r)
Data(10^^r,~10^^r,10^^r)
Data(10^^r,10^^r,~10^^r)
Data(10^^r,10^^r,10^^r)
I'm also not good at optimizing stuff, so if anyone can give some hints for the optimizing too...
Edit: Btw, this is for Axe
