TiXL Meetup 2026-08-10 / Drone-Show Choreography, Video Pipeline & Audio Graph

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A 5h33m TiXL developer meet-up: reaction-diffusion feedback experiments, a broad 4.3 preview (asset link files, the node-based audio graph, timeline video editing, FFmpeg playback, HAP export, texture-array frame history), and a long collaborative session choreographing a 100-drone show with speed and collision validation and a texture export to Blender.

🆕 new feature · 🛠️ improvement · 📘 operator · 📝 walkthrough · 🧠 deep dive · 🍿 showcase · 🎯 planned · 💬 discussion · ⚠️ heads-up

Chapters

• 0:00 📝 Warm-up: physarum + reaction-diffusion feedback (Sharpen, Blur)
• 11:15 📝 FastBlur and 32-bit textures in feedback loops
• 14:06 📝 Masked parameter sweeps; steering with DirectionalBlur
• 21:23 📝 Warping the diffusion with ShardNoise
• 25:36 🎯 Output management: the physical-units canvas
• 32:10 🆕 The timeline as a lightweight video editor
• 34:20 🆕 Asset link files: per-machine media paths
• 39:07 🆕 The node-based audio graph (PlayAudioClip, envelopes)
• 48:39 🧠 Nested clips with local time ("pre-comps")
• 55:54 📘 PlayVideo vs. VideoClip: random access vs. frame-sync
• 59:06 🧠 GPU decode: the playback-performance mode
• 1:03:05 📝 A clip switcher from FilesInFolder
• 1:05:40 🧠 Why seeking is slow (GOP length); HAP and ProRes
• 1:08:24 🆕 Continuous render range for capturing improvisation
• 1:09:30 ⚠️ HAP export needs a .mov container
• 1:20:29 📝 Frame history with KeepInTextureArray
• 1:23:55 📝 Time displacement from a Texture2DArray (CustomPixelShader)
• 1:30:15 ⚠️ Texture formats silently promoted to 16-bit
• 1:37:43 📘 TimeDisplace: the ready-made version
• 1:39:30 📝 Pre-warming the history buffer (Once, CountInt, StopWatch)
• 1:46:31 📝 Crude motion detection from frame differences
• 1:59:48 📝 Where the background soundtrack lives now
• 2:04:12 📝 Building the drone-show scene: night sky and flight cage
• 2:20:08 💬 Emulating a 10 FPS device; a project frame-rate idea
• 2:23:00 📝 A logo as 100 drone positions (DetectEdges, PointsOnImage)
• 2:32:33 🧠 Speed validation in a CustomPointShader (previous-frame trick)
• 2:47:00 📝 Brute-force separation checks and visible safety spheres
• 2:57:40 💬 SVG outlines as evenly spaced targets
• 3:02:51 📝 Speed-limited morphs via particles + ReconstructiveForce
• 3:06:30 📝 Tuning CollisionForce for a real safety radius
• 3:19:56 🧠 Reconstruction vs. collision: the tuning fight
• 3:27:10 📝 Chaining crossfades to a spiral formation
• 3:33:09 🧠 Inside CollisionForce: hashing and resolve speed
• 3:40:15 📝 Baking the show to a texture for Blender
• 4:12:40 🧠 Bloom under RenderDoc: a frame-capture tour
• 4:49:00 📝 Fleet-wide color fades and choreography polish
• 5:29:37 ⚠️ Strip QA warning colors before exporting