June 2020 – FOSSdome

3D stereoscopic test

Years ago I used Blender to make a stereographic test. It took forever to render a tiny, very low resolution test so I had to drop it at the time. (http://youtu.be/MWpsBb3enek if you want to see it.)

Now it is 2020 and I had some time last week. I couldn’t find the blend file from my original example, so I made a new example, again using Blender.

Really should be viewed with VR goggles, and you’ll need to tell YouTube to use a higher resolution setting, but the compression wasn’t too kind. Even so, I’m encouraged to continue.

I’m still looking for a way to inject the needed metadata on Linux. I had to do this on a Windows machine because the injector is only for MacOS and Windows.

BTW, I had to render this twice because originally I rendered it side-by-side (SBS) but the YouTube Metadata Injector only accepts top-and-bottom (TAB).

Here’s the same frame in each format:

3D stereoscopic test frame, SBS.

3D stereoscopic test frame, TAB

A stitch in time (or space)

Since the planetarium will be operating online for the foreseeable future, I’ve been working on ways to give everything a nice local touch.

One way has been to make custom panoramas for use with Stellarium.

William M. Staerkel Planetarium

Parkland College

Champaign-Urbana Astronomical
Society Observatory

We should be able to use them with our Digistar 6 in the dome when we are able to reopen. I like making content that can be used on different platforms

I used a DSLR with a fisheye lens on a tripod to get a good selection of overlapping images, making sure to have some shots with objects of interest centered.

I used Hugin to stitch the images. It’s not super automatic, but there are builtin tools for aligning and for masking out troublesome spots.

Finally, I use Gimp to fix up the nadir a bit and to get rid of the sky. I also fix up any small stitching errors that I missed earlier. Some distant power lines and light poles will end up cut in the process, but I can live with that.

It’s a messy process, but I use brightness and contrast settings and sometimes desaturation to get a nice mask. I work in smaller sections and then combine them.

And I usually have to over-mask the vegetation because I don’t have the patience to cut out around each leaf.

Don’t forget to check your edge seams. Layer > Transform > Offset and select “By width/2” with “wrap around” selected for Edge Behavior.

Confessions of a FOSS fangirl

My name is Waylena, and I am a FOSS fangirl. I love that FOSS is both free as in speech and free as in beer. I love that I can poke around in source code and follow developer mailing lists. I love finding FOSS production tools, techniques and workflows. And I love teaching FOSS tools to others.

I am not, however, a FOSS fundamentalist.

At work I use a variety of closed-source software packages and tools. From the software that runs the planetarium (Digistar 6) to the usual commercial office and production tools. For production I mostly use FOSS because I’m faster with GIMP than I am with Photoshop, and faster with Inkscape than I am with Illustrator. I had finally started working heavily with After Effects before the shutdowns, but working at home I’ve been almost entirely FOSS.

Blender

…and more, on Linux

I prefer Linux whenever possible because to me it’s usually friendlier. I am still using my Linux box, but now I’ve added a Windows 10 machine. The machine is a 2-year old gaming machine. In addition to the regular tools, I can now also run the full version of WorldWide Telescope, and OpenSpace. Openspace can be compiled for Linux, but I had not been successful at it yet. (New version should change that.)

So now I have a second computer with a commercial OS and some FOSS tools that either aren’t available or aren’t yet readily available on my favorite FOSS OS. But that’s okay. On my Linux box there are tools like Subtitle Editor and VokoscreenNG that aren’t available for Windows. (There are alternatives, these are just my favorites at this time.)

My favorite FOSS software is both FOSS and multiplatform, but I have plenty of room in my ~~heart~~ toolbox for useful software tools that don’t fit neatly into any category.