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.

Microsoft Azure and colony ship panoramic render 

I decided to open an Microsoft Azure account, and use the $200 in free points for new members to render a better version of my colony ship panoramic scene [edit: click here for an external view]. I was still unable to add atmospheric media and radiosity inside the station habitat. They simply take too long to render, even with dual 8-core CPUs and 32GiB of RAM. If I could afford several virtual machines linked together to form a render farm, maybe it would be feasible to enable them. But that would cost a lot more than the points I have available, I think.


Google Cloud has a similar offer for new customers, but limit you to a single CPU with 4 cores and 8 threads until you “upgrade” your subscription. So I did not find it very useful.

Restoring old links to tutorials, working on my spinner scene 

I noticed this week that some links to tutorials I had written a long time ago had gone dead, either because the websites they were hosted at went down, or because the websites they were hosted at transitioned¬†to a new content management system or wiki. I fixed these links where I could, and re-wrote them and incorporated them into my website where¬†I couldn’t. See my POV-Ray, Lego, GearHead and Geometry pages.

Today I also started working on a new panoramic scene for GearHead (now abandoned by its creator, judging by the game’s website) based on my previous Spinner Colony scene. Since I bought a new computer I am able to render them much faster in POV-Ray. Here’s a sneak peek:


Here are my latest two renders. I tried to render at a higher quality level, including atmospheric media and a nice area light, but it was simply taking too long. The source code can be found on my GearHead page.

 photo gh_scene_spinner_interior_22_zpsz7ux45lq.png photo gh_scene_spinner_cutaway_20_zpsjfw5duxe.png

(Click for larger views.)

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