Challenge #892 "Astronomy" (24/07/20) Entries CLOSED

Theme #892 for Friday 24th of July 2020 is:


Entry closes on Monday, 22:30 GMT (Mon, Jul 27, 2020 10:30 PM)

How do I post my entry? Here is an Example: (click to open)

Title: Galaxy of the Apes


Please remember to state if your entry is pure, open or non-competing.

“There are two main goals for these contests: Fun and Glory.
Fun: You get only 4 days to create a cool image, based on the theme for the week.
Glory: After 2 days of voting, a winner is declared. The winner picks the theme for next week.”

For details please check out the: CHALLENGE RULES

Btw.: Comments are welcome in both threads (entries/voting). Have fun! :slight_smile:

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Suzanne Stargazing on the Porch

Pure entry, Cycles render, 32 samples & compositor denoising in 2.90.0 beta. Golden Triangles composition, 5x8 aspect ratio. Starry night backdrop is procedural. Things I did for this that I’ve never done in Blender before: rendered & composited multiple view layers (wanted the stars to have a bit of blur without blurring Suzanne and the telescope), then used the Glare Node on the stars.

SuzanneStargazing_017.blend (1.2 MB)

Edited to add: Yeah, I’ve replaced it with a newer version thrice now – tweaking things. :flushed:


Oh… my black hole render could have fit really well now… :sweat_smile:

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Yeah, it would – wanna do another one? :hammer_and_wrench:

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Great theme! Working on something. Not sure if it will stick.



Eye to the Universe


Couldn’t you have used z depth for the blur?

I don’t know, use the same concept twice…

but that gives me an idea… and since i didn’t do anything yet, let’s try something :heart:

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Closest Approach - Pure: cycles, procedural textures, compositor, etc

“After so much time, AlLo-1A, loaded with Earth’s and Humans’ items and data, finally arrives to FUR-4234, hoping to find not only life and science, but also good friends.”

That was a fun one to make! :heart:


I don’t know enough about z depth to think of that – I did consider depth-of-field which I’ve used before, but I’m not competent enough with it to fiddle with it when I’m trying to get something done quickly, and I only wanted a little bit of blur to soften the star noise. Compositor’s Blur Node is something Millani showed me last year, but unlike that time I was unwilling to blur the whole thing. I could’ve easily rendered the backdrop separately and composited in GIMP, but I thought that Blender’s Compositor had to have a way to do it, and it shouldn’t be hard to figure out. Was a bit harder to figure out than I thought it would be. And the compositing would have enough effect on the final that after doing it in another program I’d’ve marked my submission Open, I wanted to keep it Pure.

The Z Buffer/Depth Buffer is (essentially) a B&W image that holds information about how far thing are. You can render it along your main scene and use it as map/mask (between 0.0 and 1.0) to control a Blur filter (or what ever node you want) inside the compositor. Easy. — Of course there’s no right or wrong way to do art, now, you know a bit more about composition!

I’ve never used multi-layer composition, tbh… so, i have no idea (Something else to learn about :D)

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Thanks, I’ll try that sometime!

A lot of what I do (outside of the Weekend Challenge) is multi-layer, but that usually means multiple transparent-world Blender renders (often of completely different scenes) that I use as clipart in Inkscape and/or to composite in GIMP. This is the first time I’ve used multiple view layers / render layers in Blender to do it all at once.

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Depth of field (or the way I do it) is extremely simple, I always put at least a bit. I just check the depth of field box, choose the focus object to be the main focal point object in my scene, and then decrease the f-stop for more blur or raise it for less.

And i sometimes go crazy and set 0.001 F-stops

Saddly, Blender rounds it as 0.1 :neutral_face:

That is strange. It may show a rounded value but the real one should be used when rendering.
Do you see a difference when you lower the value even more?

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I tend to add an empty name it DoF and then enable depth of field and use the DoF empty as the target. Position it wherever you want after that point.


Honestly, i never tested. Since Blender says “its 0.1” i say “ok, 0.1 will be!”

For static scenes, i just set the main object as the DoF target

My Night Sky

Pure entry: 1000 samples.


500 sample
4 hour render