Author Archives: Udart

WebGL experiment: Expose line drawing

Here’s a WebGL demo I made – when you click the canvas a hand drawn image slowly appears. Try it out: http://udart.dk/webgl/expose_line_drawing/ The effect is achieved using a shader based technique called reaction diffusion as a mask over the image. The reaction effect ‘feeds’ on the line drawing and gradually spreads as far as possible following the [...]
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Introducing Sliider – VJing with a web browser

Sliider is a simple yet usable application I’ve created for VJing with webGL and other interactive web based graphics. It works on Mac OSX, Windows and Linux. I am releasing an early preview version that has these features: Embedded Chrome browser. 99% of what works in Chrome will work in Sliider. full screen output A B crossfader Load [...]
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Download Sliider preview version

Sliider preview version is released for Mac, Windows and Linux. It is open source and free. For Mac you can choose between a Syphon and a Fullscreen version. Download from the table below. Also download a set of example visuals that demonstrate the capabilities of Sliider: Download examples #hor-minimalist-b { font-family: "Lucida Sans Unicode", "Lucida Grande", Sans-Serif; font-size: 12px; background: [...]
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Syphon into the web browser

Yes apparently we can have a Syphon input into the web browser. It is a workaround done via Quicktime. So it has some limitations. The biggest limitation being that we can not use the Syphon input as a texture in WebGL. When I did this I prepared a Syphon server in Quartz Composer and converted [...]
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Live online remix of the maps at here.com

A remix could be many things but in this case the word refers to some modifications I made to the maps at here.com in realtime using the Node-Webkit framework. Like this: What you see on the right is a screen-shot of the live and navigable application at here.com but interface elements have been removed and the [...]
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Getting started with WebGL

WebGL Experiment in three.jsHere’s the thing that takes up my spare time right now: WebGL. For me with my web developer background (PHP, javascript, .NET) and my growing interest in realtime 3D graphics it’s so obvious that I can’t believe I haven’t played around with it before. The good thing is that at this point [...]
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Lost In Uncanny Valley

That’s what I call my current visual explorations. There’s something endlessly fascinating to me in these 3D humanoid characters and their movements so I will definitely continue to explore this theme through animations, VJ performances etc. Here’s a few animated GIFs (I hope they play in your browser) plus a video from a recent performance [...]
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Finding the right beat

Waveclock - BPM detectionAt those (admittedly few) occassions when I VJ alongside DJ I have often wished for a tool that would detect the tempo of the music for me. The more I searched for a Mac based solution the more I realized there is some pretty complex music analysis behind beat detection and [...]
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Using cues, timelines and VJ software for performances

These days as a part of the Obscura crew I am ofting doing visual shows that have more in common with theatre productions than traditional VJing. Often there is some sort of script for a show or a piece of music that is rehearsed. For these types of jobs I have found good use for [...]
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Concrete forest

Concrete Forest – an art project that turned into a party from Obscura on Vimeo. The video shows the result of a fun little project we did in collaboration with artist Louise Bech Pedersen. We cut out these animal figures of a special acrylic rear projection material and used them for mapping using Modul8 and MadMapper. Doing [...]
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  • About me

    Vibeke Bertelsen is a visual artist based in Copenhagen who specializes in motion graphics and video projections for live music and other events. Per 2010 I am a part of the group called Obscura working full time doing large scale visuals and video installations. Contact me on