Warning: Some combinations of parameters can create large flashing animations which may trigger photosensitive epilepsy in certain people. Please be aware that pulsating or flashing images flashing in a significant portion of your field of view may be harmful to some. Use the tool responsibly.

About

I'm making a bullet hell game for the bullet hell jam 2022, and I needed some projectiles using a custom palette. I figured it would be easier to just animate the bullets in Javascript rather than drawing them in GIMP. So I did that, then I added another feature... and another... and like 10 more.

Anyway, here's a tool for generating orbs, bullets, particles, explosions, portals, dust and all kinds of other effects. It has a ton of different parameters you can set, and all of them have little tooltips which vaguely describe what they do. You can then export the orb as a spritesheet or as an animated PNG (APNG) file. Those work in most modern browsers.

How to use

You can either configure the orbs from scratch, loading your own horizontal palette image and fine-tuning all the parameters, or you can just click the RANDOMIZE EVERYTHING button and see what comes out.

Attribution

The tool uses a few open-source libraries.

For PNG exporting and importing, UPNG is used with the pako dependency:
https://github.com/photopea/UPNG.js/ https://github.com/nodeca/pako

The graphical user interface is created using dat.GUI:
https://github.com/dataarts/dat.gui

The perlin noise for clouds is created using the noisejs library:
https://github.com/josephg/noisejs

For doing conversions between the RGB and CIELAB color space, code from color-convert is used: https://github.com/Qix-/color-convert

For comparing colors, the Delta-E 1984 algorithm is used, through code adapted from https://github.com/zschuessler/DeltaE 

Palettes are from lospec with the same name.


Once again, I hope you find this tool useful for your game development. Suggestions and critical feedback are welcome. I'm a bit slow to respond but I do read your comments.

(PS: If you want to share some good looking orbs, I'll put them in the sidebar)

StatusReleased
CategoryTool
PlatformsHTML5
Rating
Rated 5.0 out of 5 stars
(17)
AuthorDonitz
Tagsanimated, art, gamedev, Generator, Pixel Art, Procedural Generation, Simple, Sprites, spritesheet, tool

Development log

Comments

Log in with itch.io to leave a comment.

This is amazing! is there a version I can download onto my computer for offline use?

I would need to package the app using electron or tauri for it to work offline. I'm not really comfortable recommending people to install a local webserver to run it.

Hey, Donitz! I really wanted to interview you about the games you make. What’s the best place to contact you?

How do I export these as gifs? like I see in the sidebar 

Using the Save animated PNG button.

(2 edits) (+1)

Thank you for this very useful program.

(+1)

This is such a wonderful tool and can add so much variety to our games.  This is great for bullet hells but I can also see these designs being utilized in other cases, like portals, trippy backgrounds, etc.

very cool

wow im, hooked

(7 edits)

Love your work!

Any chance we could get a store and reload on the parameters as a whole? it would be handy to revert back after using the mutate button.

Excited to see what you come up with next.

Thank you!


Done, now the mutate button only mutates the last orb until you decide to apply the mutation.

(+4)

Works great!

(+1)

Very nice! Looks like unity.

(+3)

Nice! I love using procgen stuff cause I am not very creative myself and sometimes I just like looking at the wacky outcomes.