Little history on Digital Lighting Effects

Another amazing feat from production teams at Pixar Animation Studios, Emeryville, California, “made possible by modern technology (William*)”. With processors and memory available in such large quantities more computing can be done in less time, with time being money, and films having a limited budget it means higher quality films can be made at lower special effects costs.

Simply put: How?

The film WALL·E uses a derivative of the Ray Tracing Technique, light rays are projected perpendicular to the viewpoint plane into the digital environment and reflected off surfaces until a set number of bounces or they reach a light source. This creates a very realistic looking shot, with the realism being proportional to the number of reflections, 1 bounce casts shadows but doesn’t produce any ambiance, 3 looks only just plausible but will be too dark, 8 would be acceptable for daytime television and a full 16 or more are used in motion pictures.

As you can imagine each bounce has to be remembered, the colour information of its reflecting surface(s) and the distance between each one until it matches a finishing condition, this has to be done for each pixel. A rough idea of film resolution is 2048 by 1152, that’s 2,359,296 light rays (2.4 MegaPixels) every 1/24 of a second. An awful lot to remember for just one frame of 129600 in a 90 minute feature.

Is there a simpler way?

There are many other ways, each with pros and cons, my particular favourite, for sentimental reasons, is Ray Casting, the technique used extensively in the film Tron (1982).

Ray Casting functions in a similar way to Ray tracing except there are no bounces once reaching a surface, colour and shading is faked. With less information to remember the process is a lot quicker but also has more inaccuracies. If the shading and colouring isn’t done proficiently then the entire shot looks fake.

Further Advances

There you have it, the basics in how light and shadows are produced digitally. Mathematical equations work out the path a real light ray might take, complicated stuff made possible by the advances in technology. Luckily Pixar aim to create one frame (1/24 second) to be rendered in 3 minutes, making a whole film take a year, so its safe to say we’re a long way off being able to create photorealistic digital environments in realtime. When that happens I would worry, if we could create a near perfect environment in a simulator and you went into that simulator how would you know if you really left?

Delivery Day

To cleverly order the exact amount of kit for the World Scout Jamboree attenders orders were taken from every Unit and person for what they wanted from a catalogue of items, anything from cufflinks to neck-ties was available to order. The orders were taken a whooping 6 months earlier and today we finally get the first of our kit with the World Scout Jamboree Brand on.

For International Service Team Members like myself its just for the Jamboree management to save some pounds on delivery which means that the money saved can be spent on something much more worth while like improved food services or a few extra types of brew in the IST bar tent.

For Unit Leaders its an entire different kettle of fish, they have they have to collect not only their own kit but all the kit of the participants in their Unit! They each get (sleeping tents, Uniform, badges, scarf, woggle, ruc-sac and holdall more…) so there is an awful lot to take.

As well as the kit collection a few presentations have been scheduled to lift the veil on information pertaining to arrival and a few other unknown aspects.

And possibly the most important event to all the members of the the Go Jamboree website; a chance to meet each other!

What started as a simple circle around a rather flimsy mess shelter turned into a small village of Go Jamboree members, past present and future! It was marvellous to meet some people who until now were either had their posts associated to their profile through a username or nondescript avatar.

Having put so much time into creating the website, forum and paraphernalia getting thanks and congratulations in person it was very heart-warming to know that people are appreciative.

Hopefully I’ll get to meet all of our members at the world Scout Jamboree!