# Can impossible be possible? (The real challenge)

THREAD CLOSED
 Thread Tools Search this Thread Display Modes
 10 October 2013 Archangel35757 Expert portfolio Michael Lawler Engineer Madison, USA Originally Posted by lecopivo: I didn't read the whole thread but I think I have solution to original problem just have a look http://www.youtube.com/watch?featur...d&v=5Oip-YiKuik Download: http://www.4shared.com/zip/MqwiOuUt/multiParent_1.html? if you are interested in math behind have a look here http://tomsmathjourneys.blogspot.cz/ few points: I will reference to the scene that I have in video i.e. two control locators and box which is controlled. 1. I am not doing any kind of parent switching to break evaluation loops! You can rotate around two points simultaneously. I do some funny math to figure out what actually means to rotate around two points at the same time. 2. Because of 1. directly moving locators is disabled. Imagine you rotate around locator1 so locator 2 get translated therefore the whole system has to move. But you just wanted rotate around locator1. 3. Rotation of locator1 is not altered by locator2 and vice versa. You have full control of locators rotation. This way I can break the dependency loop. If you need something fixed with system just link it to the box. 4. Position and rotation of system depends on history of locator's rotation. So you have to specify state of the system at some time t0 and than the node do some numerical integration from time t0 to time t. In current implementation the integration is done from time t0 to time t each time you change something. So even when you change from time t to time t+dt it will recalculate everything from time t0 to (t+dt). But It could just do one more step in the integration. But the advantage of current solution is that you can randomly jump in time. 5. It would be cool to have one move controlel which would be fix with the system but for now I don't know how to do this. If you need some move control just edit parent start position of the multiParentNode Ok... @lecopivo, I read your revised method you posted in your updated blog (two pivot nodes A and B, and one helper node H). I do understand your math... and I have implemented a MAXscript DLX extension that calculates the matrix exponential (using angleaxis values to first construct the required cross-product matrix...)-- thus allowing me to sum the rotations of nodes A and B (regardless of order, as you explain in your blog) and apply the total rotation to node H... ...BUT I'm struggling with how to actually implement your "update equations" in a 3ds Max construct while avoiding illegal-self referencing or circular dependencies. I'm not sure if I should try and do all of this in a custom attribute definition on the helper node H. Or try and use wire expressions or script controllers??? Any ideas or guidance from anybody would be greatly appreciated. It would save me some headaches... Last edited by Archangel35757 : 10 October 2013 at 09:03 PM. share quote
 10 October 2013 CGTalk Moderation Expert Thread automatically closed This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum. __________________ CGTalk Policy/Legalities Note that as CGTalk Members, you agree to the terms and conditions of using this website. share quote
Thread Closed share thread

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts vB code is On Smilies are On [IMG] code is On HTML code is Off CGSociety Society of Digital Artists www.cgsociety.org Powered by vBulletinCopyright ©2000 - 2006, Jelsoft Enterprises Ltd.
Minimize Ads
Forum Jump
 Please select one User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home -------------------- Gallery     CG Awards     Featured 2D     Featured 3D     Latest Entries Main     News     General Discussion     Featured Videos     Education     Off Topic     Recruitment         Temp Job Board Challenges     CGSociety/IAMAG Beyond the Wall     Stylized Environment Challenge     Lighting Challenges     Professional Feedback Software     Autodesk Maya         Maya Dynamics         Maya Rendering         Maya Character Setup         Maya Programming     Autodesk Miscellaneous         Autodesk MotionBuilder         Autodesk Mudbox         Autodesk Softimage             XSI: Programming             ICE: Interactive Creative Environment     Autodesk 3ds max         3dsMax Tutorials & Tips         3dsMax Resources         3dsMax SDK and MaxScript         Plugins & Add-ons         Particle Flow     Maxon Cinema 4D         Cinema 4D Resources     The Foundry Modo         The Foundry Time Travel Challenge     Pixologic ZBrush     Photoshop / Painter     Side Effects Houdini     Blender     Lightwave 3D         LW Resources         LW Tutorials     Allegorithmic Substance         Substance Designer         Substance Painter     E-on Software Vue     Compositing Software         The Foundry Nuke         Adobe After Effects         Autodesk Effects and Compositing         Eyeon Software Digital Fusion WIP     WIP/Critique: 3D     WIP/Critique: 2D         Speedpaints & Sketchbooks     WIP/Critique: Animation     Collaborative Projects Techniques     Art Techniques and Theories     Digital Matte Painting         Digital Matte Painting Mini-Challenge     Modeling         Modeling Challenge             Member Model Collection     Texturing and Surfacing     Character Rigging     Animation     Lighting and Shaders     Compositing and Editing     Anatomy and Figurative Art         SPOTLIGHT: Best of the Artistic Anatomy and Figurative Art Forum         Tutorials and Workshops         Personal Anatomy & Sketchbook Threads         References, Resources, and Supplies Technical     VR/AR     Game Engine     Graphics Programming     Technical and Hardware
Miscellaneous

All times are GMT. The time now is 11:04 PM.

Powered by vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.