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Douglas Urner's Projects

shopnotes icon shopnotes

Resources for setting up a small shop - with no apologies to the publication.

simple_form icon simple_form

Forms made easy for Rails! It's tied to a simple DSL, with no opinion on markup.

skhscal icon skhscal

Dynamic calendar for schools on an AB block schedule.

solarsystemsimulatorgame icon solarsystemsimulatorgame

This is a simulation of our Solar System and a game at the same time made mainly for educational purposes (it gives a good sense of the time and space scale of out Solar System). The planets the moon and the Space Crafts follow realistic (elliptical) orbits in phase space and the relative sizes of planets and moon are correct. For the orbital elements of the planets I used values according to the NASA planetary fact sheet. The radius of all planets and moon is increased by a factor of 30 to avoid floating point errors since the GPU internally is using single precision arithmetics. The planetary orbits are pre-computed at start time using a 4rth-order Runge-Kutta integrator. Specifically the 2nd Kepler-law (which is a differential equation) is solved for the values according to the Nasa Fact-Sheet for the planets of our solar system and the moon. The trajectories of the Space-Crafts are calculated at run time using a 2nd order Leapfrog Integrator with initial conditions based on user input and Earth's position and velocity at the time the Space Craft is launched. The goal of the game is to launch Space Crafts and complete the missions. Check out the video in the right for gameplay footage. Note that in order to play the game you need a mouse with a wheel. Programmed with C# and powered by Unity.

sprites icon sprites

Small set of sprites for game prototyping.

status-stats icon status-stats

A derivative of @segphault's status-wordcount. Displays wordcount, grade level, and Flesh-Kincaid scores, to help you write for your audience.

tdd-tetris-tutorial icon tdd-tetris-tutorial

Tutorial for learning TDD. You make a Tetris game by writing code to pass the test cases. See README for instructions.

tdi icon tdi

Noted on VW TDI engine troubleshooting & repair – ALH and BEW engines.

tic-tac-toe-kit icon tic-tac-toe-kit

Unity project to facilitate experimenting with Tic-Tac-Toe mechanics.

unity-examples icon unity-examples

Small examples - and links to related tutorials and other resources - for game design class using Unity.

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