Author Topic: 3D in Basic (Read 5775 times)

Halifax · « **on:** August 29, 2006, 06:59:00 pm »

I was thinking one day about making a 3d game in TI 83+ BASIC with Xlib, and I have some ideas on how to move the 3d objects but I don't have the equations, so I was wondering if someone could help me find a way to draw a cube and rotate it in all four ways.

lolje · « **Reply #1 on:** August 30, 2006, 12:48:00 am »

If you asked me, I don't know but I think they should integrate this Engine into xLIB:
user posted image

0_o

DJ Omnimaga · « **Reply #2 on:** August 30, 2006, 01:17:00 am »

O_O

HOLY s***! more and more 3d engines o.o

I saw the one from benryves on mc but not that one. It could be a good feature indeed

but managing all collision detection may be very slow with all those math/if/then

lolje · « **Reply #3 on:** August 30, 2006, 02:38:00 am »

No, I mean a function like the shape function, The Input would be coordinates (X,Y,Z) and size (also X,Y,Z). That should not be such a big problem...

You could e.g. use a 2D-Engine, but 3D-Graphics :lol:

DJ Omnimaga · « **Reply #4 on:** August 30, 2006, 03:37:00 am »

i c >.<

elfprince13 · « **Reply #5 on:** August 30, 2006, 09:33:00 am »

I did a wall based 3d maze engine in pure basic a while back, it worked pretty well too, and if I optimized it I can probably wrench some more speed out of it.

Halifax · « **Reply #6 on:** August 30, 2006, 12:43:00 pm »

Actually I found the equation to convert 3D points to 2D on a plane from some C documents so I made a copy of the C programs in BASIC for true 3D rendering but sadly it is very slow it takes about 2 seconds to render 8 3D vertices

Dragon__lance · « **Reply #7 on:** August 30, 2006, 12:48:00 pm »

if you want psuedo 3d, be sure to check out CDI's p3d! It's really cool!

DJ Omnimaga · « **Reply #8 on:** August 30, 2006, 01:00:00 pm »

if someone have a BASIC routine to do wireframe 3D stuff I would be happy to mess with it a little just for fun

kalan_vod · « **Reply #9 on:** August 30, 2006, 02:31:00 pm »

QuoteBegin-xlibman+30 Aug, 2006, 19:0-->

QUOTE (xlibman @ 30 Aug, 2006, 19:00)

if someone have a BASIC routine to do wireframe 3D stuff I would be happy to mess with it a little just for fun

Someone on UTI made one with xLIB.

Halifax · « **Reply #10 on:** August 30, 2006, 03:06:00 pm »

This is a C to BASIC translation so it's not perfect but it is true 3D. Im just posting it so someone can mess with it. I know how to do rotations with it but I haven't implemented that yet but if you want to know then just ask and i'll post it. Although it is sorta hard to understand kinda. Also I have a way to make it solid instead of wireframe which is also hard to explain but if needed to know then just ask.
-Recommended screens settings are -94,94 for X and -94,94 for Y too.

L=list thingy

c1-->

CODE

ec1
Clrdraw
\\This list is used to tell the lines which points to connect
{0,1,1,2,2,3,3,0,4,5,5,6,6,7,7,4,0,4,1,5,2,6,3,7}->LLin
\\This is used to store 3D vertices to 2D transformations
{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}->LSRC
\\This is the work list because you want to keep your orignal list there at all times
{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}->LWOR
\\This is the camera in 3D space
{0,0,20}->LCAM
\\This is the center of the screen
{0,0}->LSCC
\\These are your 3D vertices
{-10,-10,-10,10,-10,10,10,10,-10,-10,10,-10,-10,-10,10,10,-10,10,10,10,10,-10,10,10}->LCUB
\\This variable is the distortion
8->D
->B
For(A,1,24
If B<3:Then
B+1->B
Else
1->B
End
LCUB(A->E
LCAM(B->F
\\It is required that you subtract the camera position (x or y or z) depending on B
E-F->LWOR(A
End
-1->B
For(A,1,24,3
B+2->B
LSCC(1->E
LWOR(A->F
LWOR(A+2->G
// coord.x = screen_center.x + (distortion * 3Dcoord.x)/ 3Dcoord.z
E+(D*F)/G->LSRC(B
LSCC(2->E
LWOR(A+1->F
// coord.y = screen_center.y + (distortion * 3Dcoord.y)/ 3Dcoord.z
E-(D*F)]G->LSRC(B+1
End
For(A,1,16,2
round(LSRC(A,->X
round(LSRC(A+1,->Y
Pt-On(X,Y
End
\\Now we draw the lines in to make the cube
For(A,1,24,2
LLIN(A)*2+1->W
LLIN(A+1)*2+1->V
LSRC(W->X
LSRC(W+1->Y
LSRC(V->Z
LSRC(V+1->theta
Line(X,Y,Z,theta
End
c2

ec2

runtogetdone · « **Reply #11 on:** August 31, 2006, 01:46:00 am »

Here's a http://www.rafb.net/paste/results/eKrD7599.html to some basic 3D formulas that might prove useful
(Thank tr1p1ea for the links, not me

)

DJ Omnimaga · « **Reply #12 on:** August 31, 2006, 02:33:00 am »

OMG I'll try asap, I hope I can convert code to tigl format tho

, maybe someone could post a 8xp?

Halifax · « **Reply #13 on:** August 31, 2006, 11:42:00 am »

That link doesn't work

Also I'm working on implementing rotation into that source code above, but anyways xlibman the 8xp format is attached.

Alex · « **Reply #14 on:** August 31, 2006, 03:43:00 pm »

I'd like to experiment with a little 3D myself hehe

I wish you guys good luck, pushing calc limits is always fun and admirable

- Alex

Author Topic: 3D in Basic (Read 5775 times)

elfprince13

Dragon__lance

runtogetdone

Alex