[Bf-committers] GSoC 201 - Automatic Skeleton Extraction
Nathan Vegdahl
cessen at cessen.com
Tue Apr 30 04:54:20 CEST 2013
For something like this to be really useful, I think it needs to be
user-guide-able. And even then, it would mostly be useful for
background characters, not hero characters (which need fine tuning by
an artist).
I can imagine this being useful, for example, for fully automatic
rigging of a crowd's worth of background characters. But it would
need to take guidance from the user regarding the style and morphology
of the characters, and the topology, naming scheme, and alignment of
the skeleton to be generated. And honestly, I haven't a clue what
that would look like.
In general, building base skeletons is not the bottleneck of rigging
characters anyway. And even if you want to make that faster, just
having better/faster tools for doing it manually would get you more
bang for your buck than automatic generation, I suspect.
--Nathan
On Thu, Apr 25, 2013 at 9:02 AM, Alexander Pinzon Fernandez
<apinzonf at gmail.com> wrote:
> Automatic Skeleton Extraction
>
> Alexander Pinzon Fernandez
>
> Email: apinzonf at gmail.com
>
>
> Short description:
>
> The character animation is generally done with skeletons that control each
> joint in the character which drastically simplifies the animation process.
> The construction of the skeleton given a polygon mesh is a task typically
> performed by an artist. This project proposes to implement a method for
> extracting the skeleton automatically given a polygon mesh.
>
>
>
> *Name*: Alexander Pinzon Fernandez
>
> *Email*: apinzonf at gmail.com
>
> *IRC*: apinzonf
>
> *www*: http://apinzonf.wordpress.com/,
> http://wiki.blender.org/index.php/User:Apinzonf
>
> *Additional Contact Info*
>
> *Phone*: +57 300 2 92 74 30
>
> *Physical Address*: Cr 81 H No 42a-58 sur Bogota-Colombia
>
>
> Synopsis
>
> The character animation is generally done with skeletons that control each
> joint in the character which drastically simplifies the animation process.
> The construction of the skeleton given a polygon mesh is a task typically
> performed by an artist. This project proposes to implement a method for
> extracting the skeleton automatically given a polygon mesh.
>
> This method iteratively contracts the shape in the reverse direction of the
> curvature flow, with a constraint that forces the contracted model will
> closely match the original. In each iteration eliminates details. After the
> model volume is close to zero is passed to the next stage in which through
> a special surface simplification method removes vertices to obtain a 1D
> structure.
>
> Paper used:
>
> AU, Oscar Kin-Chung, et al. Skeleton extraction by mesh contraction. ACM
> Transactions on Graphics (TOG). ACM, 2008. p. 44.
>
>
> Benefits to Blender
>
> This project proposes a new tool for blender user that requires extract the
> skeleton of polygon meshes.
>
> This method allows to obtain the skeleton of a polygon mesh quickly and
> automatically.
>
> This method is insensitive to noise because it uses a smoothing algorithm
> for contraction which removes the noise and detail in each iteration.
>
>
> Deliverables
>
> 1. A new skeleton extraction tool for Blender.
> 2. Some pages of documentation to be included in the manual
> 3. A technical document for developers to improve the method in the
> future.
> 4. A tutorial explaining the use of the tool.
>
>
> Project Details
>
> The project would divide into seven parts:
>
> 1. Iteratively contracting the mesh until the volume is close to zero.
> 2. Simplifying polygon mesh to obtain a 1D structure (skeleton).
> 3. Relocating skeleton nodes in the center of each segment.
> 4. Create vertex groups for each node of the skeleton.
> 5. Converting a 1D polygon mesh into an armature.
> 6. Link vertex groups to bones of the armature.
> 7. Generation of the documentation and tutorials.
>
>
> Project Schedule
>
> - *2 Weeks:- May 27 – Jun 09:* Iteratively contracting the
> mesh until the volume is close to zero.
> - *3 Weeks:- Jun 10 – Jun 31:* Simplifying polygon mesh to
> obtain a 1D structure (skeleton).
> - *2 Weeks:- Jul 01 – Jul 14:* Relocating skeleton nodes in
> the center of each segment.
> - *2 Weeks:- Jul 15 – Jul 28:* Create vertex groups for each
> node of the skeleton.
> - *3 Weeks:- Jul 29 – Aug 18:* Converting a 1D polygon mesh
> into an armature.
> - *2 Weeks:- Aug 19 – Sep 01:* Link vertex groups to bones of
> the armature..
> - *1 Weeks:- Sep 02 – Sep 08:* Testing the tool and Define and
> implement graphical user integration.
> - *2 Weeks:- Sep 09 – Sep 22:* Generation of the documentation
> and tutorials.
>
>
> Bio
>
> I graduated as systems engineer in Colombia in 2007.
>
> I am a MSc computer science student at National University of Colombia.
>
> Skeleton extraction and mesh smoothing are the research topics of my MSc. I
> am use CGAL, Graphite and Qt libraries.
>
> Since 2007 I am a member of the Bioingenium Research Group of National
> University of Colombia.
>
> I have been using Blender for about 10 years. I was working on the develop
> of a operator to remove noise from a mesh at GSOC 2012 – Blender suchi
> branch “Mesh Smoothing for 3d Scan Data”.
>
>
> WORK EXPERIENCE:
>
> 2012 Google Summer of Code – Blender Foundation: “Mesh Smoothing for 3d
> Scan Data”.
>
> 2010 - Scire Foundation, Software Architect:
>
> Design and development of web services data, hibernate and oracle.
>
> Programming GUI with RichFaces.
>
> Library of generic manipulation of trees, based on Java reflection
> techniques.
>
> 2005 - 2007 Sigtech, LTDA, Developer Engineer:
>
> SIGC System Development for the "Departamento Administrativo de
> Catastro Distrital DACD".
>
> Software used in development: Oracle 9i, Visual Basic 6, PL / SQL Developer.
>
> 2004 -2005 IIE and Colciencias, Student Monitor research:
>
> Project: " Theater of Memory in Virtual Worlds:"
>
> Architecture for handling streaming video that comes from a digital
> camcorder and put it as a texture of a 3D plane in a virtual setting, using
> the Java software, J3D, JMF, VRML, X3D.
>
>
> SOFTWARE DEVELOPED:
>
> Nukak3D http://sourceforge.net/projects/nukak3d
>
> 3D medical image platform for visualization and image processing.
>
> Nukak3d is a flexible architecture that integrates general-purpose
> graphics libraries such as VTK, ITK, VTKInria3D, OpenGL, under a graphical
> user interface (wxWidgets) for three-dimensional visualization and
> processing of medical images. On C++.
>
> JNukak3D http://sourceforge.net/projects/jnukak3d
>
> Software for three-dimensional visualization of DICOM images based on java.
>
> JVC1394 http://sourceforge.net/projects/jvc1394/
>
> Wrapper for the library Libdc1394 to enable communication with the Java
> programming language. Java Video Capture for IEEE 1394 cameras. On C, C++,
> Java, Swig.
>
>
> PUBLICATIONS
>
> León J., Pinzón A., Sánchez C., Romero E. A distributed plugin based
> architecture for medical image processing. Proc. SPIE 8674, Medical Imaging
> 2013: Advanced PACS-based Imaging Informatics and Therapeutic Applications,
> 867403 (March 29, 2013);doi:10.1117/12.2007180.
>
> Pinzón, A., Leon, J.C., Romero E., Diseño y desarrollo de una
> aplicación web para la visualización eficiente de imágenes medicas, con
> procesamiento 3D por software o por hardware. En Seminario Internacional de
> Procesamiento y Análisis de Imágenes Médicas SIPAIM 2009, (Noviembre 27-27,
> 2009), Bogotá Colombia.
>
> Pinzón A., Romero E., Visualización 3D de imágenes médicas: una
> herramienta Open Source, En Seminario Internacional de Procesamiento y
> Análisis de Imágenes Médicas SIPAIM 2008, (Noviembre 24-27, 2008), Bogotá –
> Colombia.
>
> Mendoza, B. U., Ramos, G. A., Mendez, L. M., Santamaria, W.,
> and Pinzón, A. 2006. Camera Motion Control from a Java 3D
> Environment: Virtual Studio Application in Decorative Arts Museum
> Collections. In Proceedings of the 2006 international Conference on
> Cyberworlds (November 28 - 29, 2006). CW. IEEE Computer Society,
> Washington, DC, 58-64.
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