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Start halloween already. 🎃
My entry for the Rive Halloween Challenge is a jack-o-lantern with no mesh and no textures. Every pixel is a ray marched signed distance field in a WGSL shader running on Rive's GPU Canvas. There's a candle inside that bleeds through the rind, and fog drifts around him under a bloom pass.
His head follows your cursor on a spring. Move toward the Start button and his mouth opens, his brows drop, the violins swell and the screen starts to shake. Click it and the candle goes red, green, orange, the rim lights spin, and he dances and twirls to a disco loop I generated in Python.
How I built it:
• I wrote the scene in RML with the Rive CLI and a coding agent
• One scene shader plus a bloom chain do all the rendering
• Luau scripts drive the shader, the spring motion and the audio
• Around 50 view model properties are data bound (face shape, lights, fog, bloom)
• State machines handle the button states and party mode
• I tuned the colors, lighting and mood by hand in the Rive Editor
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Related posts
The table is haunted, so is the cue ball!
For the @Rive Halloween Challenge here on Contra, I've channeled my inner demons to create a spooky 8-ball pool game called 'Ghoul Table'. 🎱
It was built entirely in Rive using the new CLI, 3D objects, shaders, physics and more... and it ships as a .riv file under 10MB!
What crazy cue ball should I add to the game next? I'll implement the best suggestions!
Halloween Hotel: a crooked Gothic hotel under a giant moon. Click the windows to catch 15 famous monsters mid-routine (Dracula shaving at a mirror with no reflection, the Mummy wrapping himself in toilet paper, the Grim Reaper working the front desk) and find them all before sunrise. Every set of three you finish plays a reward, and finding everyone finally lights up the NO VACANCY sign.
How it was built: I modeled and baked the hotel in Blender, and it runs as real-time 3D (140k triangles) inside Rive's GPU Canvas, with custom WGSL shaders for the sway, the shutters, the neon and the magic. Claude Code and the Rive CLI wrote the scene in RML and the logic in Luau, and checked their own work with --verify and headless screenshots. Data binding drives the guest cards, the tracker and the mobile layout, and state machines run the card, the welcome and the finale. After rive push, I refined it by hand in the Rive Editor.
Features used: Rive CLI + GPU Canvas, plus Scripting, Data Binding and State Machines.
Play it (best on desktop with sound on): https://halloween-hotel.vercel.app
Loved this! I found 14 out of 15. Maybe the flying witch was the 15th and I missed clicking on it. Don't ever remove this! Bookmarked forever!
• Oct 7
Haunted Brew - Halloween Coffee
I transformed my 3D coffee product into Halloween edition.
Concept: Coffee steam morphs into a friendly ghost to boost seasonal e-commerce sales.
Rive Workflow:
Used Rive CLI (RML) to generate ghost smoke morph
Made fog + flicker + ghost trail with WGSL shaders on GPU Canvas
Added human touch by editing ghost eyes & opacity in Rive Editor
Interactive: On hover ghost wiggles (State Machine)
Tools: Spline for 3D base + Rive for shader animation
