Author: Waylena

Planetarium professional since 1992. User of Free and Open Source Software since 2001.

Final(ish) update for Hugin and Blender Eevee

Additional testing held up. Distant fuzzy stuff at the edges blended nicely.

As expected, anything near intersection edges with glowiness would blend oddly, although not nearly as bad as I thought it would be.

That means rendering out separately the things to have glow applied and then do glow in compositing after stitching.

This will require serious planning but will still be worth it for the speed advantage with Eevee.

So in conclusion, I can happily add Eevee + Hugin to my production workflow.

Hugin and Blender Eevee Fulldome Master Update

It worked!
Recall that I was testing to output 6 cube faces from Blender 2.8 using the super-fast Eevee render engine. Instead of 90 degrees, they covered 110 degrees so that Hugin would blend the edges.

It worked originally BUT there was a problem with the enblend program that put strange artifacts when run from the command line. Turns out that there is a newer way to use Hugin from the command line, a program called hugin_executor -BUT it didn’t allow for specifying input filenames from the command line.
Sooooo… I set up the script in Linux to copy the 6 cube sides to a scratch folder and rename them to the filename in the PTO file. Then it blends the 6 images into a fulldome master file and moves onto the next frame number in the sequence. 
My script needs cleaned up a bit and it isn’t pretty to look at. But it works and I can set it going and walk away from it while it does all the work. 

Now I need to test it with a variety of scene types to see how the seams turn out. Even if I can’t use this for all cases, it will still work for enough situations to have made this worth my while.

I’ll keep updating on this, and will share the scripts and make a tutorial or how-to if there is enough interest.

Using GIMP to slice images

A very cool effect in our digital planetarium is to take slices of an image and use them to seemingly build or break apart the image.

In our Digistar system, I create an empty object to be the parent of all of the needed image planes and position the image planes accordingly.

By keeping the image slices organized in folders, the separate image planes can be assigned slidesets to advance or reverse through a set of images.

To make the image slices, I use GIMP.

 

There are lots of ways to place guides for cutting. I’m accustomed to a script that lets me put the guide positions in by percentage. I don’t speak German, but the script maker does. 

I check the boxes to indicate that I’m setting the guides by percentage, then I enter percentages and select horizontal or vertical.

My guides are in place.

Select Filters > Web > Slice

Because the slice tool is meant for web work, an html file is created. I just delete that later.

And then I have a folder full of sliced image pieces!

Testing with Blender and Hugin

Blender 2.80 features the superfast render engine Eevee, but there’s no fisheye camera as there is with the Cycles render engine. So it’s back to the old-fashioned method of rendering out panels to be stitched together.

Instead of rendering out 90 degree panels, I’m trying 110 degree panels and then using Hugin to stitch with blending. To reduce nastiness of seams, at least making them less obvious.

One frame at a time works great, but scripting it to run from command line and iterate through the frames isn’t working so great. Yet. There is a newer Hugin command-line program called hugin_executor.exe that works exactly like stitching from the gui, but I haven’t figured out a way to pass along different input files than the ones saved to my custom PTO file. I might try a script that copies each set into a scratch folder and renames them into what the PTO file wants, then renames the result and puts into a results folder.

Blender
Hugin

Blender workshop at the 2017 Pleiades Conference

This was another great memory.

I had lots of wonderful help running the workshop, and I was very proud of the result. The materials include several examples of methods for creating fulldome content with Blender 2.79.


The materials are currently on my GitHub account – click “Clone or Download” to download the whole thing as a zip file.

2017 Blender Workshop Materials

I hope to remake the materials with Blender 2.80. Mostly the same, but the interface and shortcuts have changed. The new features are still evolving and could merit a new chapter.

I’m keeping the Blender 2.79 materials around, though. Folks with older computers might not be able to run Blender 2.80.

Untitled

Memories… From a very early GLPA Blender workshop…  2009 if I had to guess.