Sunday, October 9, 2022
HomeGame DevelopmentThousents of bullets logic/efficiency logic - cocos2d-x

# Thousents of bullets logic/efficiency logic – cocos2d-x

Hello,
I used to be enjoying some previous retro video games and began questioning how did they do it again then. There the place shootemups video games the place you actually had a whole lot of bullets flying across the display screen. And any of them might kill you.
I’ve been studying some cocos books (previous however nonetheless legitimate I assume), and plainly the logic is to retailer all of the bulllets on display screen in a ccArray and within the replace methodology you do a CCARRAY_FOREACH (which i suppose in cocos3dx 4.0 is now CCARRAYDATA_FOREACH).
So in case you have say, 200 bullets, and the sport is 60 fps, it implies that the replace methodology is checking 12000 intersections per second!! + every little thing else in your sport logic.

I come from a CGI background the place you progress meshes with thousents of vertices per second ar 24 fps, which is sort of regular. So I ponder, being new into sport growth, if 12000 intersection checks per seconds is loopy or is doable.

thanks,
R

okay, I’ve been studying abit on the subject and plainly one of the best ways to do it’s to make use of a pool and sphere colliders (apparently quicker than field colliders). So insteand of instanciating and destroying all of the bullets,
they’re created all of sudden off display screen, after which simply transfer round and reposition out of display screen when not wanted.

1 Like

Hi there, I believe they might of simply test the gap from and object to object,
not all of the factors of a physics object in an engine.

Example code.

float diffY = p1.y – p2.y;
float diffX = p1.x – p2.x;
return sqrt((diffY * diffY) + (diffX * diffX));
then if the gap is much less then say 2 then collide, however again within the day it could of additionally been Assembly language.

That’s is fascinating(You can avoid wasting efficiency although with out making use of the sq. root)
My concern was extra about creating the sprites cases than the collisions. Instead of making and destroying the sprites cases, they will all be created directly off display screen at loading time, after which simply transfer then round. For occasion, when colliding, as an alternative of destroying the sprite and creating a brand new one once more, simply transfer it again off display screen till you want it.
I do one thing comparable with some background clouds. Create as soon as, and as soon as they go away the display screen, set the place out once more and restart.

Yes thats the enjoyable half about video games programming, you make it up as you go alongside optimisation is vital, however keep in mind it’s all faux so when your swimming in water your probably not it’s simply graphics, however just like the matrix “Your mind makes it real”, I discover it enjoyable programming and animation, it’s like previous cartoon it’s left to your creativeness.
We use many tips like hiding issues off display screen or as a result of cocos makes use of nodes you may simply present or conceal node that tells the engine if its is to be drawn, utilizing one participant and altering the colure so it appears like many alternative gamers to save lots of reminiscence or tile maps reuse the identical tiles to create an infinite scrolling map that was the arcades favour trick in case you performed MAME earlier than you may see they rotate pallets and use tiles and all types of trick’s to create the phantasm. Cocos2x can pull off all these tips and them some, “On steroids”, the extra you get into it the extra enjoyable cocos is. I don’t know in case you program in any respect or in case you do or begin studying this can be a actual enjoyable engine to play with numerous assistance on right here the admins on listed here are incredible at serving to out too they actually helped me with my ip & pictures this was one thing I missed they usually picked up on sensible. anyway take pleasure in and have enjoyable.

sure, I’ve been a software program dev for the final 15 years. I exploit to work within the movie CGI business the place I wrote rigging software program in python and C++ plugins when heavy realtime computation the place required.
I not too long ago swap to the sport business (received a bit burned from working in large movies studios).
This the sport I at the moment creating

shootem up sport dev WIP

It is small sport that I’m utilizing as a “workshop” for future extra critical and lengthy video games.

Hay thats superior is there an finish boss? jogs my memory of – R TYPE beloved that sport. is it operating on Android or IOS appears like its on home windows?
Make me need to write one now ought to solely take about 20 minutes with this engine

Cheers.
Yeah, love rtype, final resort, bomber trip… So many incredible video games.
The sport is one stage with rising problem with totally different sections that correspond to new enemies and on the finish it will likely be a last boss sure.
I do submit wips on Instagram if you wish to take a look, seek for rudi_hammad.
The platform is PC. I’m not focusing on Mobil, a minimum of with this one.

is it utilizing cocos2dx or a special engine

oh cool so you may recompile for something then, good one. I mite have to interrupt out the compiler and have a go at one thing like that forgot how a lot I really like all them shoot em ups, I’m so old-fashioned I’m a scrambler , defender, sinister all them 8 bit arcade sport was fortunate once I was younger I lived on the price of Bournemouth in uk we needed to 2 pier’s they usually the place choked filled with all of the 80 video games once they was new, So had a misspent childhood enjoying all them arcade video games lol:).
however you’ve sparked me into making an attempt a shoot em up sport now thanks.

Cool.
A number of previous video games maintain very effectively immediately. And it’s not all about 3d, raytracing and the final tech… Look on the final ninja turtles video games, it offered rather well.
Anyway, getting off subject right here. Good luck together with your initiatives.

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