CS /15-667: Simulation Methods for Animation and Digital Fabrication
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1 CS /15-667: Simulation Methods for Animation and Digital Fabrication Instructor: Stelian Coros Office: Smith Hall 229 TA: Chris Yu Web Page: 1
2 What is this course about? Modeling the physics of daily life 2
3 Modeling the physics of daily life Equations known for a long time Motion (Newton, 1660) Elasticity (Hooke, 1670) Fluids (Navier, Stokes, 1822) Simulation made possible by computers 1938: Zuse Z1 d /dt(mv) f σ Eε t v 2 v v k g 2014: NUDT (China) v 0.2 ops 54,902 teraflops (3.12M cores)
4 Computational Sciences Technological progress Scientific Computing Computational Elasticity Computational Fluid Dynamics Computational Astrophysics, Leverages and drives Numerical Modeling Basis for simulation of natural phenomena
5 Aims of Physical Simulations Computational Sciences Reproduction of physical phenomena Predictive capability (accuracy!)
6 Aims of Physical Simulations: Substitute expensive experiments 6
7 Aims of Physical Simulations: Substitute expensive experiments 7
8 Aims of Physical Simulations: Substitute expensive experiments 8
9 Aims of Physical Simulations: Predictive Models for Robotics Applications 9
10 Aims of Physical Simulations: Predictive Models for Robotics Applications 10
11 Aims of Physical Simulations: Predictive Models for Robotics Applications 11
12 Aims of Physical Simulations: Predictive Models for Robotics Applications 12
13 Aims of Physical Simulations: Predictive Models for Robotics Applications 13
14 Aims of Physical Simulations: Computational Design and Digital Fabrication 14
15 Aims of Physical Simulations: Computational Design and Digital Fabrication 15
16 Aims of Physical Simulations: Computational Design and Digital Fabrication Lu et al., Siggraph 2014 Stava et al., Siggraph 2012 Wang et al., Siggraph Asia
17 Aims of Physical Simulations: Computational Design and Digital Fabrication
18 Aims of Physical Simulations: Computational Design and Digital Fabrication 18
19 Aims of Physical Simulations: Computational Design and Digital Fabrication 19
20 Aims of Physical Simulations: Computational Design and Digital Fabrication 20
21 Aims of Physical Simulations: Computational Design and Digital Fabrication 21
22 Aims of Physical Simulations: Computational Design and Digital Fabrication 22
23 Aims of Physical Simulations Computational Sciences Reproduction of physical phenomena Predictive capability (accuracy!) Computer Graphics/Animation Imitation of physical phenomena Visually plausible behavior Speed, stability, art-directability Different goals require different methods!
24 If you understand how the physical world works, you can create your own worlds
25 Animation Goal: create believable and compelling virtual worlds! Examples: Character animation Secondary motion Physical world (humans, animals) (hair, cloth) (rigid bodies, water, fire)
26 Animation Techniques Keyframing Manually specify system state at times t i Interpolate inbetween t i t i+1 t i+2 t i+3 t i+4
27 Animation Techniques Keyframing Animator moves/poses characters by hand
28 Animation Techniques Motion Capture Record motion of actors to move/pose characters
29 Animating Complex Systems? Keyframing/motion capture fine for characters and simple motions but many physical systems are just too complex
30 Alternative: Physical Simulation 1. Identify/derive mathematical model (ODE, PDE) 2. Develop computer model 3. Simulate
31 Cloth & Hair Disney s Tangled
32 32 Muscles & Flesh Nvidia s The Great Kulu
33 The Great Kulu Nvidia Tech Demo, 2008
34 Fluids Movie Battleship
35 Fluids Movie Battleship
36 Particles & Rigid Bodies Movie 2012
37 Particles & Rigid Bodies
38 Course Fast Forward Will explore various phenomena Questions you should ask: What do you want to simulate? How do you want to simulate it? Interactively? Accurately? Other criteria? How do you know the simulation model works well? Where does the model break? 38
39 Course Fast Forward The book of nature is written in the language of mathematics. Galileo Galilei 39
40 Course Fast Forward ODEs & Numerical Integration Particle & Mass-Spring Systems Intro to PDEs Fluid Simulation Continuum Mechanics and Finite Elements Rigid Body Kinematics and Dynamics Applications to animation, robotics and digital fabrication 40
41 Course Fast Forward Goals Learn techniques & some cool math Fun coding & problem solving Presentation Skills 41
42 Course Fast Forward Grading Scheme Assignments (40%) (+ Prizes!) Mass-spring systems (10%) Particle-based fluids (10%) Finite Element Method (10%) Rigid Body Dynamics (10%) Test (10%) Final Project (50%) Paper presentation & project proposal (20%) Final report & presentation (30%) Talk to me about topics as early as possible 42
43 Questions? 43
44 Questions for you What is your name? Tell us about yourself Experience OpenGL? C++? Math? What do you hope to learn? What do you want to simulate? 44
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