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Slope Detection

(160 posts) (31 voices)

Started 4 years ago by Niall
Latest reply from redligot2009

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Niall
Member
Post Count: 248

I emailed Brad about this and never got a reply, so I'm trying my luck here instead.
I've asked on numerous forums, NG, TGH etcetera, but I can't get any help, it seems Brad is the only one who knows about this stuff well.

I try making a simple platformer, but when the character hits a slope it either goes straight through the slope slowing down gradually (due to a friction variable) or just jerks about the place, I know this is due to the angle of the character versus the vector's normal.

I realise that the way Brad does it is finding the vector's normal by using anchors and finding the distance between each one therefore calculating the angle to rotate to, but I just can't get it to work.

If anybody (preferably Brad himself) could maybe provide an example (like his engine shown in making of FPA) or make a tutorial, I would greatly appreciate it.

Oh yeah, my AIM is niallatron, and MSN is NiallTL[at]hotmail.com.

Posted 4 years ago #
Nyubis
Nyubis of Strata
Post Count: 9151

I've been looking for this too.
Brad posted a prety good code somewhere, but it doesnt changes the angle.
I've tried thousands of times to get it done, but none of them worked.
But hey, its vacation now, so I got some more time to try.

[EDIT]
Found Brad's code (it was used for falldown):

ball.moveUD = 0
ball.onEnterFrame = function() {
if (Key.isDown(Key.RIGHT)) {
this._x += 5
}
if (Key.isDown(Key.LEFT)) {
this._x -= 5
}

if (level.hitTest(this._x, this._y, true) ) {
this.moveUD = 0
while(level.hitTest(this._x, this._y, true) ) { this._y -- }
} else {
this.moveUD ++
this._y += this.moveUD
}
}

//and of course, to make the level rise:

level.onEnterFrame = function() {
this._y --
}

Not in cruelty
Not in wrath
the Reaper came today.

An Angel visited
this gray path
And took the cube away.

Posted 4 years ago #
steve
Member
Post Count: 104

you need to take the gradient of the line

Posted 4 years ago #

Secret
Nyubis
Nyubis of Strata
Post Count: 9151

Notice how he mentions Brad's vid:
http://www.kirupa.com/forum/showthread.php?t=297758

Not in cruelty
Not in wrath
the Reaper came today.

An Angel visited
this gray path
And took the cube away.

Posted 4 years ago #

Secret
rawcru
Member
Post Count: 1232

Don't understand one word. Vectors and that kind of stuff...

Posted 4 years ago #
Niall
Member
Post Count: 248

Nyubis, the code you showed doesn't really do much, it's just basic variables for gravity and correctiong the _x and _y based on the grounds height.

I did very much like the example in the kirupa thread in the author's post that he was troubled with, it used slope detection but unfortunately he provided no source, so I guess I won't find out.

Brad seems my only hope.

Posted 4 years ago #

Contact us
rawcru
Member
Post Count: 1232

Hey Brad? This chap needs some help!

Posted 4 years ago #
Niall
Member
Post Count: 248

Righto good sir!

Unfortunately Brad doesn't come on here often so hopefully FO or someone will see this and annoy Brad about it

Posted 4 years ago #
VideoGuy
Spielberg
Post Count: 8723

I'm not sure FO comes around here either. But Brad will help you eventually.

Maybe you should try Googling it.

Just got back on the internet after losing my access for a week. Read more on Random Discussion.

Posted 4 years ago #
rawcru
Member
Post Count: 1232

I think Google is not going to help.

Posted 4 years ago #
VideoGuy
Spielberg
Post Count: 8723

It could. There are a lot of things out there on the internet.

Just got back on the internet after losing my access for a week. Read more on Random Discussion.

Posted 4 years ago #
Niall
Member
Post Count: 248

Trust me, I have googled for the past 2 months or more looking for an answer, I have searched for a loooooong time.

Nobody but the aazing dynamic super-powered Brad-atron can save me now!!!*

*slight exaggaration

Posted 4 years ago #
rawcru
Member
Post Count: 1232

See? I knew it!

Posted 4 years ago #
Niall
Member
Post Count: 248

You sir, you and your crazy mind powers!!!

Lol.

Posted 4 years ago #
VideoGuy
Spielberg
Post Count: 8723

Whatever. Don't gloat.

Mind powers?

Just got back on the internet after losing my access for a week. Read more on Random Discussion.

Posted 4 years ago #
rawcru
Member
Post Count: 1232

Yeah didn't you know I'm a superhero?

Posted 4 years ago #
Nyubis
Nyubis of Strata
Post Count: 9151

Right...

Anyway, I think Brad is the only one who knows how to do this WITHOUT any problems.
So we'll have to ask him, tried asking it on the main blog already?

Not in cruelty
Not in wrath
the Reaper came today.

An Angel visited
this gray path
And took the cube away.

Posted 4 years ago #
rawcru
Member
Post Count: 1232

Yeah you should try it.

Posted 4 years ago #
VideoGuy
Spielberg
Post Count: 8723

He still reads the main blog, but there are over 100 threads in this forum, and like 30 threads in game development. He can't read them all.

Don't post the whole problem there, just say something like

Hey Brad, I'm having trouble with some slope detection stuff. I made a topic about it on the forum here. Could you check it out?

Just got back on the internet after losing my access for a week. Read more on Random Discussion.

Posted 4 years ago #
Niall
Member
Post Count: 248

What a capital idea sir.

I shall go to it.

Posted 4 years ago #

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