View Full Version : Pulley system using solvers... etc

11 November 2006, 06:52 PM
I hope I posted this in the right spot. If not, please move it. :D

Using either maxscript or Solvers (or both)... I need to animate a rope on a pulley that is connected to a crate (box). The rop will lift the box up using the pulley system. :\ Anyone know how to do this? Or any tips/tricks? Suggestions?


11 November 2006, 08:27 PM
Does it have to be dynamic?

You could probably do this with standard modifiers.

11 November 2006, 09:31 PM
Thanks for replying. But, what do you mean by Dynamic? 0_o ... I assume it means on the fly ... and time ... not keyframed?

Well, the assignment is for creating a mechanical animation using Solvers, Wiring parameters, or Max script. So, it cannot be keyframed. Sadly. :(

11 November 2006, 09:43 PM
Ah, I see, that is a conundrum... I'll see if I can think of something, but if you want my advice try to get PEN's attention, he's really good at this kind of thing.

11 November 2006, 09:47 PM
Well, the assignment is for creating a mechanical animation using.....

LoL, are we doing your homework? :D

Well, I'd attach helpers to a spline that serves as the rope/pulley's path, and then use linked xform modifiers to move the actual rope along that path, and the box could be linkedXform'd as well....

then drive the helper's path along the spline with whatever wiring setup you'd like (moving a square in Z offsets the helpers path %....)

That's my initial thougts, but I haven't tried it to discover any problems with that method...

11 November 2006, 09:53 PM
LOL. Nope. ;D Teacher just didnt go over it very well and he kept having issues with it. So, I dont want to follow his 'method'. :shrug:

11 November 2006, 10:39 PM
here's a quick and dirty scene, it's not perfect, but depending on what your desired end result is this might work, or it would at least show you the first few ideas of how you could approach a more complex setup.

11 November 2006, 01:40 AM
SnipeyX - Thanks. Ill try this out. :D

11 November 2006, 08:48 PM
The teacher didn't know how to do it eh, I remember those days. Better to just find the answer your self.

I'm with the other suggestion. Create two pullies, and two splines with two verts only on each. Add the splineIK modifier (not a solver) to each of the splines and press the create points button (or what ever it is called) . Link the points to each of the pullies and you have now move the pullies all you like and the splines will stretch inbetween. To satisfy the teacher wire the height of one of the pullies to a spinner so that it moves up and down.

11 November 2006, 08:54 PM
Thanks. Ill try this out. :D Hopefully it will render fast! Due in 2 hours. ACK!

And as for the teacher not knowing ... it is typical. :\

11 November 2006, 02:17 AM
The question...
LoL, are we doing your homework? :D
The answer...
LOL. Nope.
The truth?...
Hopefully it will render fast! Due in 2 hours. ACK!

11 November 2006, 02:20 AM
Blue -

Well, I needed help. :D I wasn't going to just sit around and press buttons in Max and not get the results I wanted/needed. I wouldnt learn ANYTHING that way. Better to ask questions and get answers than not post at all. :D

Blizzard ... mmmmmmmm. Gaming. GAH! I miss gaming. :(

EDIT: Lost my mind.

11 November 2006, 03:01 AM
I was just making an observation, not judging. How did the project turn out?

11 November 2006, 03:08 AM
I know. :D

Gotta render out the frames ... probably gonna do that in sexah VRay. :D Just for fun. Ill post an animation once it is finished for crits. :D

Thanks again! Without the responses on here, Id be TOAST! :O

11 November 2006, 12:07 AM
Sadly, I couldn't use VRay to render out this weidr animation. :( But, at least it is done. There are a few spots that for some reason are jumpy. 0_o ...

I rendered these frames out as .tga and imported them into Premiere Pro 2.0 ... added sound ... and the frames are jumpy. Not sure why. It was smooth when I watched it in Max. Figures. I took a lot of time creating smooth swings on the rope. *sigh*

300 * 400, Quicktime with MPEG-4 compression ... it is what the teacher wanted.

Here is what I came up with :\ Not as good (looking wise) as I hoped. :P

Pulley system (

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