This post covers a digital video compositing technique for rendering photo-realistic water droplets moving on glass surfaces. This technique was used in a number of projects I participated in - see some examples on my portfolio website. No code is used to generate the shape or motion of the water droplets. Most of the job is done with standard two-dimensional compositing techniques. I developed the technique with Adobe After Effects and utilized software created by RE:Vision Effects. To get the effect to work properly you should use the Shade/Shape plug-in from RE:Vision Effects. You can download a demo version of the Shade/Shape plug-in from RE:Vision Effects’ website.