social topic

2015-12-01 01:28:19 pm

in the end I actually went for precomputation, because if you compute the position of the ball in real time as the shot is taken you can get into a situation where the ball gets stuck or whatever and then what do you do? you can't backtrack to an earlier point in the shot and change it so the ball doesn't get stuck because you've already drawn the ball to the screen in its currently computed position.

so I went for an approach where the shots are precaculated to completion in a separate thread and only actually animated once you have a successful solution for the entire shot. then the main thread picks up the completed shot from the physics thread and only then does it start animating the ball

DJGrenola

2015-12-01 01:30:50 pm

using two threads was sort of necessary as well because it's a multiplayer game, so you can't allow the physics computations to stall the main thread since that has to do a guaranteed 60 fps on any shots which are currently running

DJGrenola

2015-12-01 01:31:41 pm

but yeah I'm not going to pretend I planned all this out beforehand lol. I had to make all the mistakes first before I could avoid them

Turtle

Edit history:

Turtle: 2015-12-01 01:43:24 pm

2015-12-01 01:42:11 pm

I like turtles.

Quote from DJGrenola:

I'm sure that my solution is really sucky and inelegant compared to box2d or some of the other open source 2D physics engines but if I'd have gone for off the shelf solutions like that I would have learned nothing

I've come to believe that there are no elegant "100%" solutions, only degrees of cleverness in hiding their inelegance.

Quote from DJGrenola:

in the end I actually went for precomputation, because if you compute the position of the ball in real time as the shot is taken you can get into a situation where the ball gets stuck or whatever and then what do you do? you can't backtrack to an earlier point in the shot and change it so the ball doesn't get stuck because you've already drawn the ball to the screen in its currently computed position.

so I went for an approach where the shots are precaculated to completion in a separate thread and only actually animated once you have a successful solution for the entire shot. then the main thread picks up the completed shot from the physics thread and only then does it start animating the ball

That sounds kind of like how, in the platformer I'm working on, collisions take the player's current position plus their rate of travel to ensure smooth collisions that don't get one stuck in the wall - you never move too fast to be caught by the wall's hitbox because it starts checking for the collision at a bigger distance proportionate to your movement speed.

Unless it's not like that at all.

Quote from DJGrenola:

but yeah I'm not going to pretend I planned all this out beforehand lol. I had to make all the mistakes first before I could avoid them

Story of my life doing my senior project a few months back. Managed to write a far better (cleaner, anyway) platform engine in a week over the summer just applying what I learned from doing everything sloppily the first time.

[quote="DJGrenola"]I'm sure that my solution is really sucky and inelegant compared to box2d or some of the other open source 2D physics engines but if I'd have gone for off the shelf solutions like that I would have learned nothing[/quote]
I've come to believe that there are no elegant "100%" [i]solutions[/i], only degrees of cleverness in hiding their inelegance.

[quote="DJGrenola"]in the end I actually went for precomputation, because if you compute the position of the ball in real time as the shot is taken you can get into a situation where the ball gets stuck or whatever and then what do you do? you can't backtrack to an earlier point in the shot and change it so the ball doesn't get stuck because you've already drawn the ball to the screen in its currently computed position.

so I went for an approach where the shots are precaculated to completion in a separate thread and only actually animated once you have a successful solution for the entire shot. then the main thread picks up the completed shot from the physics thread and only then does it start animating the ball[/quote]
That sounds kind of like how, in the platformer I'm working on, collisions take the player's current position plus their rate of travel to ensure smooth collisions that don't get one stuck in the wall - you never move too fast to be caught by the wall's hitbox because it starts checking for the collision at a bigger distance proportionate to your movement speed.

Unless it's not like that at all.

[quote="DJGrenola"]but yeah I'm not going to pretend I planned all this out beforehand lol. I had to make all the mistakes first before I could avoid them[/quote]
Story of my life doing my senior project a few months back.  Managed to write a far better (cleaner, anyway) platform engine in a week over the summer just applying what I learned from doing everything sloppily the first time.

DJGrenola

2015-12-01 01:51:56 pm

Quote from Turtle:

Quote from DJGrenola:

I'm sure that my solution is really sucky and inelegant compared to box2d or some of the other open source 2D physics engines but if I'd have gone for off the shelf solutions like that I would have learned nothing

I've come to believe that there are no elegant "100%" solutions, only degrees of cleverness in hiding their inelegance.

yeah I'd agree with that, and I think a lot of game developers would say the same thing. I remember carmack talking about the ragdolls in doom 3 and how he was completely against using them because you get these pathological cases some of the time where the damn things don't stop twitching. but they found ways to make them reliable, which almost certainly amounted to a bunch of ugly hacks.

Quote:

Quote from DJGrenola:

in the end I actually went for precomputation, because if you compute the position of the ball in real time as the shot is taken you can get into a situation where the ball gets stuck or whatever and then what do you do? you can't backtrack to an earlier point in the shot and change it so the ball doesn't get stuck because you've already drawn the ball to the screen in its currently computed position.

so I went for an approach where the shots are precaculated to completion in a separate thread and only actually animated once you have a successful solution for the entire shot. then the main thread picks up the completed shot from the physics thread and only then does it start animating the ball

That sounds kind of like how, in the platformer I'm working on, collisions take the player's current position plus their rate of travel to ensure smooth collisions that don't get one stuck in the wall - you never move too fast to be caught by the wall's hitbox because it starts checking for the collision at a bigger distance proportionate to your movement speed.

I've also learned that collisions are always a bit of a pig. pretty sure mine took three rewrites before I got them right. having a ball collide with some irregularly shaped scenery and having to compute the normal angle so you know how it bounces off the scenery definitely took a few tries. there's a lookup table involved in that also to get the performance up, it really wasn't the trivial thing I thought it would be.

[quote="Turtle"][quote="DJGrenola"]I'm sure that my solution is really sucky and inelegant compared to box2d or some of the other open source 2D physics engines but if I'd have gone for off the shelf solutions like that I would have learned nothing[/quote]
I've come to believe that there are no elegant "100%" [i]solutions[/i], only degrees of cleverness in hiding their inelegance.[/quote]

yeah I'd agree with that, and I think a lot of game developers would say the same thing. I remember carmack talking about the ragdolls in doom 3 and how he was completely against using them because you get these pathological cases some of the time where the damn things don't stop twitching. but they found ways to make them reliable, which almost certainly amounted to a bunch of ugly hacks.

[quote][quote="DJGrenola"]in the end I actually went for precomputation, because if you compute the position of the ball in real time as the shot is taken you can get into a situation where the ball gets stuck or whatever and then what do you do? you can't backtrack to an earlier point in the shot and change it so the ball doesn't get stuck because you've already drawn the ball to the screen in its currently computed position.

so I went for an approach where the shots are precaculated to completion in a separate thread and only actually animated once you have a successful solution for the entire shot. then the main thread picks up the completed shot from the physics thread and only then does it start animating the ball[/quote]
That sounds kind of like how, in the platformer I'm working on, collisions take the player's current position plus their rate of travel to ensure smooth collisions that don't get one stuck in the wall - you never move too fast to be caught by the wall's hitbox because it starts checking for the collision at a bigger distance proportionate to your movement speed.[/quote]

I've also learned that collisions are always a bit of a pig. pretty sure mine took three rewrites before I got them right. having a ball collide with some irregularly shaped scenery and having to compute the normal angle so you know how it bounces off the scenery definitely took a few tries. there's a lookup table involved in that also to get the performance up, it really wasn't the trivial thing I thought it would be.

Poision Envy

2015-12-01 10:17:08 pm

Club 27 Goals

wtf, now that chick that sent me the fanfics started talking to me about how grimy and dirty she is, and really needs a shower. I mentioned how I love to wash girl's hair in the shower, so she wants me to come over to wash her hair and receive oral sex in return. I told her that sounds nice, except that she lives like 18 hours away. So then she started sending me pictures and videos of her in the shower.

Mind you this is the same chick that said since she's like 26 she's too much older than me to date her.

Apparently she was just doing this to "Help out" with my breakup.

arkarian

2015-12-01 10:17:55 pm

red chamber dream

oral? what are you guys, 14?

arkarian

2015-12-01 10:18:53 pm

red chamber dream

this is what i was talking about earlier, i would love to know what goes through a chick's mind when she offers a guy oral only

who the fuck wants that lol

Poision Envy

2015-12-01 10:22:31 pm

Club 27 Goals

well she was saying she's tired and shit too, so it would be like a self-service thing I guess?

She went into much more detail and more things after that, but yeah.

Poision Envy

2015-12-01 10:23:17 pm

Club 27 Goals

I'm pretty sure she's just pushing my buttons to see where I cave in, since I'm perceived as a lonely single now.

but hey I mean, she is really cute, and well endowed, so I'm not complaining.

arkarian

2015-12-01 10:23:26 pm

red chamber dream

i wouldn't worry about it because she's just fucking with you anyway

i mean you live 18 hours apart

arkarian

2015-12-01 10:23:32 pm

red chamber dream

yeah heh

Poision Envy

2015-12-01 10:27:22 pm

Club 27 Goals

so my grandma gave me $600 for christmas early, so I could go travel to another state. I already have $200 credit with an airlines.

Poision Envy

2015-12-01 10:27:40 pm

Club 27 Goals

what state to travel to go

perks of colorado is weed, although my job does drug tests once in a blue moon

Poision Envy

2015-12-01 10:27:59 pm

Club 27 Goals

and I can't pocket the $600 or use it for anything else, has to be for traveling somewhere

arkarian

2015-12-01 10:28:15 pm

red chamber dream

you are free to stay with me if you do wanna get summa dat danky dank

Poision Envy

2015-12-01 10:28:34 pm

Club 27 Goals

idunno I've heard some crazy stories from bios

Poision Envy

2015-12-01 10:28:39 pm

Club 27 Goals

and would bios be okay with that?

arkarian

2015-12-01 10:29:07 pm

red chamber dream

we're taking a break

(so his anal fissure can heal)

Poision Envy

2015-12-01 10:31:32 pm

Club 27 Goals

I wonder how long drug tests go back before. There's gonne be one at the end of Jan when I get promoted.

I knew I should've went through with that green card, I just didn't wanna pay the fees and shit.