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Submitted by Dierk Ohlerich, posted on September 18, 2001

Image Description, by Dierk Ohlerich

Ok, some time ago I copied an effect I saw in a maturefurk demo. In my version, each hair is made of a cylinder with 3x25 quads.

There are some simple fake physics, it mostly reacts on rotation which can be controlled by the mouse, but there is also some kind of gravity. each hair segment is represented by a vector. The vectors are motion-blurred and have the "will" to be straight. If I switch off all forces, the while thing moves slowly towards a star-like shape.

From these vectors I generate a coordinate system using dot- and crosspruducts, then I set up the three vertices and normals. The normals are not normalised, but it looks ok.

Then I stream everything through dynamic vertex buffers. Since I don't use any fancy vertex shaders and stuff this runs almost everywhere, in full refresh rate (75hz) on a GeForce MX + Athlon-1100, a little bit slower but still pretty well on my G400 + PII-350. I use simple dot product light, so I actually only need to calculate one third of the normal. My FVF is "xyz color". I could calculate the whole normal and use "xyz normal" as FVF and use hardware accelerated lighting, and thats what I plan to do next after my game project at work passes beta...

Performance? Well, I havn't started to optimise, therefore I have no real figures, but I can switch some more effects before it starts getting slower on the athlon machine.

Dierk "Chaos" Ohlerich

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David Olsson

September 18, 2001, 01:01 PM

I remember that effect in maturefurk's demo, it was really cool.

Do you have a binary of your demo that I can download ?


September 18, 2001, 01:11 PM

Looks cool!


September 18, 2001, 01:21 PM

hey, well done.
now do something original with it :)

Pierre Terdiman

September 18, 2001, 01:57 PM

...and now, let's add collision detection .... :)

Hey Chaos, nice to see you on Flipcode. Is there a little executable to download ? I'm sure you can do it in 4Ko. :)))


September 18, 2001, 02:25 PM

I tried doing the Maturefurk fur balls as well - but failed miserably! This looks really cool, kinda like a sea anenamy. I think thats how its spelt anyway. Kind of reminds me of the 'arms' getting moved around be the sea current.

Any plans of a download?



September 18, 2001, 02:59 PM

This looks really neat. I'd also like to see it in motion to appreciate your fake physics, so if you could post a binary then that would be cool!

- Marco


September 18, 2001, 04:28 PM

cool just upgraded my system and wanted to test it out on some demos .. and one of them was Maturefurk's. great timing :)..

Kinder Supporter

September 18, 2001, 05:33 PM

Great copy


September 18, 2001, 07:21 PM



September 19, 2001, 02:41 AM

idiot monkey


September 19, 2001, 03:00 AM

It's indeed very cool looking, binary or some further description of your technique would be nice. The furball twists funny looking to upwards, does the "hair" twist over eachother as there is no collision detection or do they "wave" almost same time?


September 19, 2001, 04:41 AM

Hi Chaos, nice to see you...

Really nice fake-physics effect, a new 64k, maybe for dialogos ?



September 19, 2001, 07:09 AM

Cool. But where is the download section ;-)


September 19, 2001, 07:10 AM


DEMO ??????


September 19, 2001, 07:14 AM

Oui DEMO ?????????????


September 19, 2001, 08:39 AM

Introduction to Demos & The Demo Scene:


September 19, 2001, 09:22 AM

I'd hate to see all the credit going to maturefurk, statix did this in his 303 demo years ago.


September 19, 2001, 09:47 AM

funny you mention that statix did it years ago, that's exactly why maturefurk get the creds (newskoolers)

btw, replay also did it in many of their demos (of the 50 or so they made ;)


September 19, 2001, 10:57 AM

Maturefurk newskoolers ?
Don't think so Tim... :)

I hope you remember Future Crew ?
Couple of those guys started Future Mark... which can be combined to Mature Furk :)


September 19, 2001, 11:20 AM

Isn't future mark now known as mad onion, which is was/is a spin off of remedy, which was founded by the future crew guys who didn't start bitboys or something?

Bah! It's all too complicated and who cares? It's just a great effect.

the effect as it is in that mature furk demo looks like pompoms. mmm.... cheerleaders... =]


September 19, 2001, 02:03 PM

you can't tell me lapsus is oldskool... they did a pretty good job with lapsuus though ;)

and i'm not tim.


September 19, 2001, 02:35 PM

Thank you, but I know what a demo is.
I was asking for a demo.


September 19, 2001, 03:41 PM

do you have a binary? will be released 29-dec-2001 :-)
can you make it in 4k? it will be between 4k and 10MB. i don't know.
collision detection? no good idea...

describe technique?

i should make a "fake physics faq". it's extremly easy, but too long to explain here. just forget everything you ever learned. just learn how to juggle with vectors and matrices, and try it the cheap way. we (vcc) made some commercial racing games with this method, and our physics aren't the worst by far.

Rasmus Christian Kaae

September 20, 2001, 09:58 AM

do i spot on this one? :-)


September 20, 2001, 11:55 AM

Cool stuff!

Rasmus Christian Kaae

September 20, 2001, 04:39 PM

nono, what replay, statix and many others did was vortex rotation. which is not entirely the same. one of the replay guys explained it in some hugi-mag or similar.

Fabian Giesen

September 20, 2001, 06:32 PM

Well, pssssssssssst, but:

- we are very slimy -


Rasmus Christian Kaae

September 21, 2001, 09:38 AM

ok, i will go make one too, and hope my intro will be shown before yours.

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