Moving materials off-site 

I have spent the last few weeks moving most of my geometry activities from this site to the online collection at the GeoGebra website. I plan to do the same for my LDraw models, either at Brickshelf, MOCpages or Rebrickable. I’ve also written a new tutorial for the POV-Ray wiki, and created a new solar system scene for the POV-Ray Object Collection and Wikipedia.

More Wikipedia illustrations 

I have been busy creating illustrations for Wikipedia. They can be seen on my user page at Wikimedia Commons. Most of them involve the spherical or elliptical coordinate systems somehow.

I also created a series of sectional drawings comparing the internal geometries of the various “Color Spheres” of (from left to right) Johannes Itten, Albert H. Munsell, and Philipp Otto Runge; as well as a fourth sphere created for comparison based on the spherical coordinate system. It is amazing how many ways there are to draw a sphere!

And I updated a couple of existing images that show how the color-making attribute saturation can be determined from the chroma and value parameters of the Munsell Color System. (Though this definition of saturation is a bit different than the one used in the HSL color space I am accustomed to.)

Lastly, I finished an old scene featuring my interpretation of Larry Niven’s Ringworld. It is a giant ring encircling a far away sun, with oceans, continents and Earth-like weather embedded into it. Here’s the latest render:

The source code for these images can be found in my new GitHub repository which I just created for this purpose.

Color space plots 

With lots of help from Christoph Lipka at the POV-Ray newsgroup, I created four more images for Wikipedia having to do with color spaces. They show the sRGB color gamut projected within the bounds of the CIELAB and CIELUV color spaces. Both the rectangular and cylindrical models are depicted. You can see all the renders, as well as some animations, on my Wikimedia Commons page.

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