OMG, OMG ANOTHER RAYCASTING ENGINE!!!

Lithium · Posted: Oct 25, 2005 20:43 Post subject: OMG, OMG ANOTHER RAYCASTING ENGINE!!!

But this time it's in freebasic

get it at my website, with a more detailed description:http://lithium.zext.net

rdc · Master

Very cool.

Adigun A. Polack

Lithium, if my memory serves me correctly, it has been *quite* a while since you have been in the QB demoscene field (I believe back in 2001, I guess! ;) ! ). Now that you are creating this raycaster in FB, I can see that you have done a marvelous job on it so far, man, texture placements and all!! ^-^=b !

My, I sure hope you convert it to ASM form within FreeBASIC indeed, because that will then be truly something, won’t it?

Talk to you again, and best to you here!!! :D

Nodtveidt · Sr. Member

Hey, not bad at all for a double-precision floating-point raycaster that doesn't take advantage of a precalculated cosine table and uses the built-in gfxlib. :) A solid 30fps on my machine and absolutely no intersection problems or "dead lines" I see a lot in other raycasters. Only problem with this one is that the camera is allowed to get too close to the wall...a minor detail though because the rest is perfect. :)

EDIT: btw, when I recompile the source, the colours become all blue and the EXE is 5k smaller. Nifty psychadelic effect man. :D

Deleter · Master

the only thing is, i set the fps to 300, and when I was looking away from a wall, the actual fps went down to 60. Considering the speed of opengl and then comparing their looks...If you were to make an actual game I would just go with GL. (btw, my gpfx card is a 6600gt and my proc is an a64 3700+)

Lithium · Posted: Oct 26, 2005 14:57 Post subject: Update

I re-wrote the floor/ceeling mapper last night using fixed point inline asm, my frame rate jumped from 8 to like 25... i'm going re-write the part that draws the walls tonight.. probably won't rewrite the actual raycasting part.. just cause i'm sure it would give me a headache :P

Also to add, sprites and doors... I have a vauge idea how to do both of them, but i'll do some research.

But holy $%#@, making the ray jump from line to line was a pain in the ass... i'm suprised i got it working :P

Lithium

I have 1.3 at home, when i compile my source in fb 1.4 everything turns blue... but not when I rewrote my rendering in ASM, writing directly to the frame buffer.

Soo... the problem is probably with line, or maybe the whole thing.

Nodtveidt · Sr. Member

When Angelo comes back from his hiatus, ask him about how he did sprites in RTe...that was a pretty solid raycaster, although it did have some minor flaws (the sprite handling was a bit "shaky" but at least it worked...).

Nexinarus · Posted: Oct 28, 2005 7:02 Post subject:

Ha nice Lithium. I still want to make a DOOM 1 sorta renderer, but im too stupid :p.

mopz · Posted: Oct 30, 2005 9:48 Post subject:

Oh my god! I love ray casting!

I wrote this one: http://user.tninet.se/cnx955d/tmp/rayeng.rar in pure C. It uses a 640x480x16 screen and renders texture mapped floors and ceilings and uses billboarding for objects. It runs at 12 fps on my 400 Mhz celeron. I'll definitely try to rewrite it in FreeBASIC (just discovered this nice language) :-)

mopz · Posted: Oct 30, 2005 9:53 Post subject:

The instructions in the program above are in swedish, sorry. This is how you control the thingie:

Mouse - rotate view
Arrow up - forward
Arrow down - backward
Arrow left/right - sidestep
Left mouse button - shoot some plasma
'+' - increase field of view
'-' - decrease field of view

Lithium · Posted: Oct 30, 2005 14:06 Post subject: Download updated!

Same url: http://lithium.zext.net/downloads.php -> raycast.zip

There's now doors and sprites, as well the rendering is done in inline ASM (with exception to the actual raycasting, which would have gave me a hernia -- Anyway, there's also a map editor included, instructions are in readme.txt

P.S. -- I hope to make a game out of this (my first 3d game!!!.. or "3d".. whatever :P) ANYWAY, as long as I can get a hold of my crazy artist friend, or find someone else who can do it.....

Lithium · Posted: Oct 30, 2005 14:11 Post subject:

nek!

O M F G!!

this is how I did sprites in mine, for each wall drawn store in a zbuffer the distance to the ray,

then rotate, clip, project the sprites (in that order)

and then draw each sprite one X at a time, if the distance fron the sprite to the POV is less that the zbuffer(X) then draw that vertical line of the sprite, otherwise not.

what I'd like to figure out tho, is how to add depth to my doors -- I think I may have figured it out last night.... but I don't remeber much about last night (beer sucks)

anyway! POOF!

Deleter · Master

wow, sweet. with your new engine, in the big room, the fps went only as low as 180 (obviously i set the max higher) and it went all the way up to 600 at times. Nice. If you make this into a game, i will definitely play it.

rdc · Master

Very nice. Makes me want to use this for my rouge-like entry for fb.tk. :)