application of force-directed graphs on character positioning christine talbot
TRANSCRIPT
Application of Force-Directed Graphs on Character Positioning
Christine Talbot
Character Positioning
Discovery News – Avatar: Motion Capture Mirrors Emotions
http://news.discovery.com/videos/avatar-making-the-movie/
MindMakers Wiki
http://www.mindmakers.org/
projects/bml-1-0/wiki/Wiki
Spatial Movement (Previous Work)
Sentence
Subject NP
Actor/Noun
VPVP Action/
Verb
NP Target/Noun
Speech Movement
Grouping Spatial Rules
Conversational Spatial Rules
Theatre Rules
General Rules
MindMakers Wiki
http://www.mindmakers.org/
projects/bml-1-0/wiki/Wiki
SmartBody Path Planning
http://smartbody.ict.usc.edu
Adding a Human
Move correctly, on-time
Move correctly, wrong time
Move incorrectly, on-time
Move incorrectly, wrong time
Don’t move at all
Force-Directed Graphs (FDGs)
Equilibrium of Forces
Aesthetically Balanced
Easy to See Nodes
Crossings-Free (some)
Fixed Nodes
Varying Relationships Based on Data
Can be Arranged in Pre-defined Shapes (some)
Force-Directed Graph Samples
WiSo-Nets: Community Detection in Facebook Friends
http://wisonets.wordpress.com/
mbostock’s block #4062045: Character Co-occurrence in Les Miserables
http://bl.ocks.org/mbostock/4062045
Force-Directed Graph Structure
Node Representations: Characters Human Target/Marks/Pawns Audience Central Grouping Point
Linkages Characters – Humans/Characters Characters – Targets/Marks/Pawns Characters – Audience Characters – Central Grouping Point Central Grouping Point - Audience Humans – Central Grouping Point Humans - Audience
A
H
T
AA
Force-Directed Graph Functions
Adding Characters
Characters Leaving
Moving Characters
Human Moves
A
H
T
TA
Forces and Time
What Does it Look Like?
Evaluation Approaches
Optimal arrangement based on current relationships
Time-based / sequential arrangement through entire scene
User evaluation of appropriate positioning
Evaluation CriteriaOptimal arrangement based on current relationships
Even Vertex Distribution Measure character distances
Small Number of Vertices Count number of vertices
Fixed Vertices Measure distance from targets/marks
Centering and Encircling of Groups Comparison to semi-circular shape
Varying Attracting and Repellent Forces Comparison of different forces effects
Results100s of Random Relationship Scenarios
Even Vertex Distribution 3.14 feet (SD=1.54) between characters
Small Number of Vertices At most 40 vertices in graph, with 12 characters
Fixed Vertices 3.30 feet (SD=1.52) from target
Centering and Encircling of Groups Characters formed nice semi-circles
Varying Attracting and Repellent Forces Varied forces for different effects
Summary
Introduced Human-Controlled Character Issues
Proposed Force-Directed Graphs
Provided Algorithms
Implemented Approach
Evaluated First of Three Components
Provided Good Initial Results
Future Work
A
H
T
3.14 feet between chars
