Game Development

// SFML Sprite definition

// Declare and load a texture
sf::Texture texture;
texture.loadFromFile("texture.png");
// Create a sprite
sf::Sprite sprite;
sprite.setTexture(texture);
sprite.setTextureRect(sf::IntRect(10, 10, 50, 30));
sprite.setColor(sf::Color(255, 255, 255, 200));
sprite.setPosition(100, 25);
// Draw it
window.draw(sprite);

// Reclusion Sprite definition

Sprite sprite = new Sprite("texture.png");
// Optional:
sprite.SetTextureRect(new Rect(10, 10, 50, 30));
// Optional:
sprite.SetColor(new Color(255,255,255,255)); // or Color::black/etc

Kevin van der Velden

@Veritas in C?

Almo

It will go to world in probably a week or so

Veritas

C++ preferably

Jon

2:12 PM

@Pip would be cool if you included a sprite bounds calc

Kevin van der Velden

Same difference: No. When you get to the compiler macros don't exist

Jon

sprite.setTextureRect(sf::IntRect(10, 10, 50, 30));

Kevin van der Velden

They are done in the preprocessor, and they are purely text replacement

Jon

you just arbitrarily set the bounds here?

Pip

yeah, it's an example

(straight from the SFML docs)

I could do some calcs, they don't seem that hard

Jon

2:13 PM

depends on what you are opening really

Pip

true

Jon

if the image is 4000x4000 it could take a longer time to calc

if you have a spritesheet, etc..

Veritas

something like C11 generic selections

Pip

yeah, true. I might have a function that does it on demand, something like CalculateBounds or something

Jon

Best thing would be to allow for a atlas

possibly link it with some sort of spritesheet tool you like

Pip

2:15 PM

definitely, I am going to add an atlas class

mhm

Feel free to contribute, I would love help

Jon

if you want to build on that, add a Frame class

Then an Animation class

Pip

Doing this for myself and a friend who wants to use this, so no lack of motivation

Jon

Texture -> Sprite -> Frame -> Sequence -> Animation

Veritas

I have a strong-typedef implementation for both primitives and non-primitive types but it requires some namespace pollution which I would like to avoid.

Pip

hmm, lemme write this down

Jon

2:17 PM

Then implement Animation scripting ;)

Kevin van der Velden

@Veritas fancy feature, your compiler will need to support it

Jon

@Almo how many people involved in this game?

Pip

Hahaha @Jon I now realize why you said to include a CalculateBounds thing

jgallant.com/…

Jon

:)

you get that from google?

Pip

yep

Jon

2:21 PM

hehe

user92578

hmm that might be a good idea

Jon

Unity does it

but they don't tie it to the bounding box of your collider.

If you use it for collider, you will need a secondary box that is the largest possible

otherwise you get issues with when the collider gets larger

Pip

SFML doesn't have a collider, I think I'm going to add one

oh man lots of ideas

Jon

AABB that shit

Almo

@Jon in making it?

Jon

2:23 PM

@Almo yeah

Almo

Just me and one friend

He did the analytics, local notifications and ads

I did the design, iOS interface and REST server

he's making the droid version now

Jon

cool

You ever do nodal pathfinding?

Almo

I worked with it a bit in Unreal 2.5 on PSP

up next is a scoring system, watch a video to add an extra entry in a contest, and some small fixes.

oh and player statistics

Pip

Alright, now's the time to decide. ECS like Unity or not?

Almo

how many times you won, etc

Jon

2:25 PM

it will get hacked ;)

Kevin van der Velden

@Pip ECSs are fun

Almo

The only hack available is to add more numbers. all the stats are generated by the server cron job

Jon

So, the general idea of a node based pathfinder, is to drop "nodes" all over the map where it is walkable

then apply a similar a* algorithm on the nodes

Almo

I don't like ECS, personally

Jon

I think moving those nodes around could also create a more organic feel

there was a kickass tutorial on this...

Pip

2:27 PM

gotta go to class, sorry

strawpoll.me/3957267

Jon

Dijkstra's algorithm

Dijkstra's algorithm is an algorithm for finding the shortest paths between nodes in a graph, which may represent, for example, road networks. It was conceived by computer scientist Edsger W. Dijkstra in 1956 and published in 1959. The algorithm exists in many variants; Dijkstra's original variant found the shortest path between two nodes, but a more common variant fixes a single node as the "source" node and finds shortest paths from the source to all other nodes in the graph, producing a shortest path tree. For a given source node in the graph, the algorithm finds the shortest path between that...

Veritas

unity isn't pure ecs

it's composition based but not pure ecs

ecs isn't very easy to get right

TreDubZedd

What's ECS, for the uninitiated?

Almo

well whatever unity is I don't really like it

what would you say makes unity not ECS?

Veritas

I have yet to see an ecs framework which I agree with

Almo

2:33 PM

@TreDubZedd Entity-Component-System

TreDubZedd

Ah, thanks

Almo

a way of organizing your architecture.

Jon

Hmmmmmm

So Unity has nav meshes built in

binpress.com/tutorial/unity3d-ai-navmesh-navigation/119

Almo

I worked on that part of the engine back in 2011

not sure if they're still using what I did though

how can someone with 3.5k rep ask this

-2

Q: Is '<' more efficient than '!='

Can someone explain the differences between use of '<' and '!=' in a for loop? for(int i = 0; i < [object count]; ++i) { /**/ } or for(int i = 0; i != [object count]; ++i) { /**/ } I remember I read somewhere that "!=" is more performance than "<".. isn't it?

Veritas

pure ecs requires logicless components

all logic is put in the systems hence the name

Almo

2:41 PM

can you give an example of a logicless component?

Kevin van der Velden

@Veritas that's an interesting interpretation of ECS, I've never heard of it that way

Heck, one of the useful features of ECS is that you can swap a component and have diffent behaviour

Veritas

yes that's because entities subscribe to the appropriate systems that are responsible for managing entities with specific component combinations

processing*

Pip

Back for a little bit, thanks for the opinions

Jon

so meshrenderers don't work in 2d

Kevin van der Velden

Or it's because instead of a "StaticRendererComponent" you add a "CharacterRendererComponent", where the staticrenderer doesn't do animations and shit

Veritas

2:45 PM

if an entity has components A, B ,C and D it will subscribe to the systems that require (A and C), (B), (C, D) etc

Kevin van der Velden

Yes

Pip

Alright, gotta come up with the next step. Something simple... maybe shapes?

Kevin van der Velden

So you want to ask for everything having (StaticRender, Position), (CharacterRenderer, Position), etc?

That seems inefficent compared to having a function pointer that changes the behaviour

Jon

unitycoder.com/upload/demos/2DAStarPathFinding4

Veritas

no need to ask anything every frame relations can be estabilished at the moment of component addition

Kevin van der Velden

2:50 PM

True

Meh

My point remains: That's one possible interpretation of ECS

Veritas

even wikipedia says that ecs requires entities which are logical collections of components, components which is raw data and systems that operate on components

well most sources say so

ofcourse there are many other composition patterns but ecs generally has a very specific meaning

Kevin van der Velden

This for example disagrees: gameprogrammingpatterns.com/component.html

Veritas

this is not an entity-component-system implementation just a composition one

I actually emailed Bob Nystrom when he was making the book to include implementation tips on ecs

Kevin van der Velden

Wikipedia also disagrees "Every Entity consists of one or more components which add additional behavior or functionality"

It does not,as far as I can tell, specify that the behaviour needs to be in a system

Veritas

yes but in the logical realm

well you can have simply state machines as components for instance

check the terminology

think of components as tagging

"this entity now has mass so it gravity can now apply to it"

Kevin van der Velden

3:05 PM

Meh

Jon

that was easy... so i can now generate nodal maps on top of my levels

Almo

have we mentioned you are a gamedev monster, Jon?

Jon

can link that to a* and we got ourselves a nodal pathfinder

lol, yah i think so

Almo

:)

Veritas

ecs can be very good if done correctly but I haven't seen many implementations that I like

Jon

3:08 PM

It might get tricky to determine if the char can fit through a hole or not

Veritas

It's not easy to implement it efficiently and without much bloat

Jon

If I spread them far apart, at just the right distance

Jon

3:23 PM

Guys.... Its time we need to fight and retake part of our nerd culture back

huffingtonpost.com/2015/03/24/…

Almo

:( some usb device is unplugging and replugging itself right now

Jon

its that keylogger i hooked up

Almo

heheh

TreDubZedd

3:39 PM

Maybe it's something like this: thinkgeek.com/product/ef0b

(where you try to unplug it, and it plugs itself back in?)

Almo

that box is actually pretty cool

Lokkij

Not for $40 it isn't

Kevin van der Velden

Heh

It's about half that price from chinese websites

Jon

3:55 PM

you could make one yourself

the schematics are online

instructables.com/id/The-Most-Useless-Machine

building it would be a lot more fun.. probably same price

you could always just hire a guy to sit in a box

Joe

cant trust people

Veritas

I though a finger came out from the box

thought*

Jon

i think Bill Gates has one

Icy Defiance

would need a small guy to sit in that box

bill gates does, in fact, have a finger

3

Jon

i heard he has 8

TreDubZedd

3:59 PM

"His is primitive!"

Lasse

whaat, people have fingers? :O

there's no way that statement can be accurate

I'm sceptical

Soapy

@IcyDefiance He also drinks sewage

Hjorthenify

4:52 PM

Hola

TreDubZedd

Heya

Jon

5:18 PM

i guess its a start..

missing diagonals

OMG you made PacMan!

nodal pathfinder

Also don't tell Pip

that works in unity

any shape

William 'MindWorX' Mariager

PacMan Finder :O

SpartanDonut

5:19 PM

:O

HE MADE PACMAN FINDER :O

Jon

hehe

William 'MindWorX' Mariager

Nooo!

SpartanDonut

Nodal PacMan Finder

William 'MindWorX' Mariager

What's a "nodal" pathfinder?

SpartanDonut

I mean look

Anywhere he clicks, it finds pacman

William 'MindWorX' Mariager

5:20 PM

Pretty cray!

SpartanDonut

@Jon is it truly nodal or do your nodes need to be in a grid?

William 'MindWorX' Mariager

What is nodal?!?!

SpartanDonut

Each dot is a node

Jon

with diags

its not truly nodal yet.

since it uses an array

William 'MindWorX' Mariager

> Nodal is a secretory protein that in humans is encoded by the NODAL gene which is located on chromosome 10q22.1. It belongs to the Transforming Growth Factor (TGF-beta) superfamily.

SpartanDonut

5:22 PM

lol

William 'MindWorX' Mariager

You lied to me @SpartanDonut.

SpartanDonut

The internet lied to you

Jon

but it is a pretty good approximation

SpartanDonut

I did no such thing

William 'MindWorX' Mariager

When people lie to me, I tend to cry.

Jon

5:22 PM

And this model should work pretty decent for most games

SpartanDonut

Cry baby

@Jon Maybe you should sell it to Pip

William 'MindWorX' Mariager

And when I cry, I get antsy. And you won't like me when I'm antsy!

SpartanDonut

gross

Jon

anyone can have it -- its pretty simple

you can write it in a couple hours

i did :P

William 'MindWorX' Mariager

Still no clue what nodal means though. :P How do you make pathfinding without nodes?

SpartanDonut

5:24 PM

@William'MindWorX'Mariager so as I understand it, node based pathing you would just have a bunch of node points on your map and pathing would go from node to node to node

Jon

1. Populate area with nodes.

2. Raycast to see if that node collides with a unpassable game object.

SpartanDonut

You can get to point Y via a path from a to b to c ... to y

Jon

2. Set node to collidable or not.

3. run pathfinder off these nodes

William 'MindWorX' Mariager

I just followed Amit's tutorial. Took me less than an hour to get it working. Pathfinding is surprisingly simple :P

Jon

This is a hybrid nodal/grid

since you generate the nodes, and populate a "grid" in memory

SpartanDonut

5:25 PM

nodal would basically be the map based approach as opposed to the grid based approach I guess

Lokkij

Oh my GOD memorizing ancient Latin letters might just be the most boring thing in the world.

SpartanDonut

At least there are no vowels?

Lokkij

Umm what?

SpartanDonut

yeah im wrong

what am I thinking of lol

Jon

I think adding a physics on the walls, that push enemies away might be a good idea

slight push

ensure they don't get stuck

SpartanDonut

5:28 PM

I'm supposedly thinking of Hebrew

my bad

Among other languages I guess

Joe

gamasutra.com/blogs/WillHankinson/20150323/239489/…. Very interesting content management using unity and google sheets

3

Almo

Brad entered 6, 4, 4. Popup: "You cannot submit duplicate entries" He closed it, and thought he had entered the code wrong. He admitted to not reading the popup.

People refuse to read text

SpartanDonut

Oh Brad

time to get lunch

Sword

this is so fudging awesome..

Jon

hmmm... can you use google docs as a data store?

Sword

5:30 PM

What if DriveClub was 60fps? [1080p] TRUE HD QUALITY

►

watch it in 720p60 or 1080p60

Jon

and in chrome.. doesn't work in ff

Hjorthenify

Hey guys check this out: reddit.com/r/gamedev/comments/2ynqyo/…

4

SpartanDonut

@Sword videos that do this really need a 720p30 option or something

Jon

Yeah, I posted this a week ago @Hjorthenify

SpartanDonut

I can't tell if I like the 720p60 better than 480 because of the resolution, frame rate, or both

Hjorthenify

5:33 PM

@Jon :(

SpartanDonut

I won't deny it looks good at 720p60 though

Jon

runs smooth at 1080x60 here

EA says 30fps is better though

says you are stupid if you want 60

Sword

these guys have done the entire COD advanced warfare walkthrough in 60fps

GnomeSlice

30 still looks pretty good

There is a difference, but it's not like it ruins the game.

SpartanDonut

If a dev has to prioritize something lower than other things I think 60fps is a good thing to prioritize lower

I'd rather them focus their time and money on something other than those 30 frames

Sword

5:37 PM

you notice the difference when you have motion like turning around .. thats where 30 differs from 60

Almo

30 differs from 60 in that it's noticably less smooth

Jon

of if you are in VR

SpartanDonut

Valid point - there are circumstances 60 could be important

Sword

boallen.com/fps-compare.html

check this

SpartanDonut

Ok... really going to get food this time

Almo

5:38 PM

that comparison is shitty

the 60fps tears and is not consistent

you don't really see the difference that well

if you compare something on a CRT from 30/60 like Gran Turismo vs Gran Turismo Hi Def or whatever it was called, it was really, really noticable.

Lasse

5:51 PM

I've managed to survive 6 months without a torrent client, but now I need one, what's the current best?

µTorrent comes with hidden bitcoin miner so dont offer that one :D

Almo

If there's a version of Transmission on your platform, I recommend that.

Hjorthenify

uTorrent

What

WHAT IS A BITCOIN MINER??

Lasse

okay, transmission it is, that's what I used on linux

SpartanDonut

Yeah was just going to say utorrent just got busted for something

Hjorthenify

O_o Should I uninstall right away?

Almo

5:52 PM

yes

use Transmission

Hjorthenify

Is it bad? uTorrent that is

SpartanDonut

you're providing utorrent free processing power for them to make money

Almo

it's chewing your computer to mine bitcoins for someone else.

SpartanDonut

So if you don't mind that then no rush

Hjorthenify

Oh wow

Almo

5:53 PM

yeah it's pretty shocking, really

SpartanDonut

is it? lol

Almo

I think so

a long-time trusted bittorrent client going asshole like that

Hjorthenify

Good news guys! uTorrent took very little time to uninstall... Suspiciously little...

Oh wow.. Skumbag Nero: Here have a free 14-day trial, BUT you can ONLY burn 100mb... wat

Also I uninstalled uTorrent but there is still 10mb worth of data associated to it INCLUDING the .exe file...

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