Escher Metamorphose II (draft)

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problem definition

metamorphose parameters

symmetry -- upper and lower along x axis
variation -- shifts along x axis, local symmetry along y axis
shape vs.contour --
- shape -- emergent form
- contour -- intersecting lines (laws of their own)
form vs. texture --
- form --line drawings, iconic 'Escher' shapes
- texture -- realism, i.e. visual effects and 'Escher' flavor

solution parameters

local transformations

local shape morphing
local contour adaptations
local alpha blending (color and texture)
local (multi) texture modifications

global transformations

shape shifting (in x-y plane)
contour corrections -- constraints?
alpha shifts -- color and texture
(multi) texture modifications

interaction aspects

separate control panel vs context sensitive 'touch' interaction
shape selection -- drag and drop (from fixed set)
sequence (shape shift) modification
(local) shape modification -- 'spreading'
special effects -- global morphing, style modifications, ...

platform options

basic (geometry) image software -- e.g. CGAL
'pure'OpenGL -- C++
high level library -- OpenWorlds
free technology -- IExplorer + blaxxun VRML plugin
research software -- DLP+VRML+Java

computer graphics issues

shape definition -- contour maps,compound shapes
image transforms -- fixed choce, algoritmic

prototype tracks

shape definition

contour maps -- extrusion (scale) profile (scale modifications)
polygon mesh --fixed sequence indexedfacesets (coord transforms)
compound shapes -- morphable proto (morph propagation)
textures -- including multitextures (alpha blending)

transformations

time-based (linear) interpolators
discrete representation of morph states
scripts -- constraints & preferences

interaction

shape selection -- touchsensor, (blaxxun) drag & drop
mouse & keyboard -- standard sensors (and handlers)
direct manipulation -- 'graphical' editors

[] readme agenda forum plan problem demos resources

eliens@cs.vu.nl

draft version 0.1 (7/6/2001)