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Can someone help with axis constraints and forward IK
show user profile  Spear Chuck
I'm trying to animate the white blocks in the red slots so they just go down the X and Y axis in line with the yellow handle crank that rotates around, keeping the white blocks in line with the rivet holes. How would you do it?

I constrained the axis of the blocks to x and Y respectively and animated them with the rotation of the arm (moving the pivot point to the end hole/rivet) but could never alien the blocks to the holes in motion.

Forward IK is the way to go using dummies? Please get me started with describing the linkage of parts.

read 872 times
1/9/2014 4:52:17 AM (last edit: 1/9/2014 4:55:00 AM)
show user profile  herfst1
I find this pretty confusing, mainly because I'm not sure on your end game... but I would maybe try wire-parameters rather than FK (I never use FK, prefer IK, but that's me).

1. make two dummies, align each to their respective pivot points, then link constrain them to the yellow arm.
2. select one white block (let's say the horizontal one first) and right click on it, choose "wire parameters," then choose, "position, x-axis," now click on the dummy and choose "position, x-axis" (it'll prompt you).
3. the wire parameters box will pop up, select either the "<->" arrow or the "<-" arrow and press "connect."
4. test it before closing the wire parameters box.
5. do the same for the other block but choose "position, y-axis"

Now when you rotate the yellow arm it should work.
read 860 times
1/9/2014 6:03:29 AM (last edit: 1/9/2014 7:41:08 AM)
show user profile  Spear Chuck
Thanks herf!
The end game is too use the animation as a preloader in flash
read 840 times
1/9/2014 2:27:24 PM (last edit: 1/9/2014 2:37:05 PM)
show user profile  Spear Chuck
It's not working. The constraints aren't keeping the white block inside the red slots even though the Link Info/Locks are all checked BUT the x for the horizontal block and the Y is checked on the vertical block.

All but step #1 I can follow. Can you reword Step 1, please?

read 824 times
1/9/2014 4:41:16 PM (last edit: 1/9/2014 5:05:04 PM)
show user profile  herfst1
I just tried it and had a bit of difficulty. Here's a vid of one of the wire parameters in action:

To expand on step 1: create a dummy, snap it to a vert (note how I divided my plane into just the right amount of segments to have a vert in the right spot), now I suggested "select and linking" it to the plane, but now I don't think that's the way to go, alternatively you could have used a position constraint... but that still isn't the way to go.

The main problem is that even if you set it up with the correct wire parameters, when you move the large plane and the dummy's follow, that won't help with the wire parameters, as the local position of the dummy will be unchanged. I think if you use wire parameters again to link the dummy's position to the plane's position it might work, but I haven't checked that out yet.

I'm thinking there might be a better solution, but I can't think of one just yet. Will post if I do.
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1/9/2014 5:22:50 PM (last edit: 1/9/2014 5:23:10 PM)
show user profile  br0t
I am not even sure if I understood how it is supposed to move, but I got this here working, if it is what you want I can explain some more because the video is pretty fast. The 150 in the expression is the range of movement for the sliders.

Here is the video:

Normal Link:

Jesus Christ the embed worked

Unable to display content. Adobe Flash is required.

another test, thanks TiMoN for the GIF

Unable to display content. Adobe Flash is required.

never get low & slow & out of ideas

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1/9/2014 7:33:25 PM (last edit: 1/9/2014 8:32:41 PM)
show user profile  TiMoN
found a little animation of what I think SpearChuck is aiming for:

apparently its called Oval regulation..

Terribly boring signature.
read 789 times
1/9/2014 8:01:41 PM (last edit: 1/9/2014 8:01:41 PM)
show user profile  Spear Chuck
Brot...Bravo! & Thanks

If you really feel inspired and would like to give me a great b-day present (today is the day) you could model it and then do a tutorial :)

The schematic is in the zip file:

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1/9/2014 8:14:27 PM (last edit: 1/9/2014 8:28:18 PM)
show user profile  herfst1
Sorry, I'm really busy, so can't model it for you, but... happy birthday.
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1/9/2014 8:40:30 PM (last edit: 1/9/2014 8:40:30 PM)
show user profile  br0t
hey Chuck, happy birthday. I won't model it for you, but maybe tomorrow I can create a longer tutorial video with voiceover to help recreate it, might be something to post on my website which would be cool

never get low & slow & out of ideas

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1/9/2014 8:42:32 PM (last edit: 1/9/2014 8:42:32 PM)
show user profile  Spear Chuck
That would be awesome BrOt

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1/10/2014 6:07:09 AM (last edit: 1/10/2014 6:07:09 AM)
show user profile  br0t
There ya' go

Oval Regulation Rig in 3ds Max from Christoph Bülter on Vimeo.

never get low & slow & out of ideas

read 724 times
1/10/2014 6:51:36 PM (last edit: 1/10/2014 6:52:56 PM)
show user profile  Spear Chuck
Thanks Brot, I'll have to do it next week. There was a death in the family and I have to leave for Fort Wayne until Thursday.

Thanks for the tutorial, I really appreciate it.

BTW: The animated Gif is pronounced "jiff", not "gif".

I worked for Larry Wood back in the 1990's. Larry was on the .gif development team for AOL in the 1970's. Larry tried to get Jiff Peanut Butter to allow promotion of the animated gif to be similar to the Jiff logo so people might associate the pronunciation with 'Jiff' and would take hold over time. Unfortunately Jiff Peanut Butter said no

Larry Wood gave me my first job in graphics ;)
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1/13/2014 5:02:44 AM (last edit: 1/16/2014 10:28:22 PM)
show user profile  br0t
You're welcome. Sorry about your loss!

Good to know about the pronounciation, I also think it's sine and cosine instead of sinus and cosinus, right? Well, next time I'll know.

Love the peanut butter story :)

never get low & slow & out of ideas

read 685 times
1/13/2014 12:50:31 PM (last edit: 1/13/2014 12:50:46 PM)
show user profile  Spear Chuck
Hey...I did it

The Alpha needs to be changed
read 645 times
1/18/2014 8:17:49 PM (last edit: 1/19/2014 5:11:04 AM)
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