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The finished result is my restored highlight along the edge of a vital crack in my wood area. This trick can be used in many of your watercolours, and as long as you don't overdo it, it can be quite effective.
DEMO Setup - DEMO Fall 2013 at the Santa Clara Convention Center in Santa Clara, California Tuesday October 15, 2013. Complete coverage of DEMO, the Launchpad for Emerging Technologies and Trends, can be found at bit.ly/DEMOsite.
Having abandoned my trial experiments in favour of a freehand brush technique, I applied wash of Raw Sienna and Raw Umber with a touch of my warm shadow colour to my stone-work area, dabbing it with tissue while still damp.
Here's a little demo I've been working on. Not yet finished, but I thought I'd share my current progress. Works fairly nicely overall, but there are a few "jitters" in the physics here and there.
Using "Gauss-Seidel" method for handling constraints (see www.teknikus.dk/tj/gdc2001.htm ).