Chaining MiniMax H3 keyframe clips for an arcade racer without perspective drift
NoMarionberry9951 · reddit · 2026-09-30
An indie dev building a 90s Sega-style OutRun-like HTML5 racer needs a continuously driving background video that accelerates with throttle. Using ComfyUI with MiniMax H3 (FL2VA + Qwen3-VL 32B + 4-step Turbo LoRA), the team anchors 5 keyframes per 5-second clip (124 frames @ 24fps) via MiniMaxH3KeyframeGuider to bridge 40 hand-drawn pixel-art checkpoints of real Bergamo streets; in-clip interpolation works well.
The problems emerge between clips: (1) perspective/horizon jitter — even with identical boundary frames, camera pitch/yaw/vanishing-point micro-drift makes roads visibly pop against the fixed 2D sprite; (2) optical speed discontinuity — irregular real-world block distances (100m vs 350m) clamped to fixed 5-second clips cause pavement flow to surge or crawl, breaking throttle coupling.
They ask the community how to pass latent momentum/motion vectors/overlapping end-frames across clips, strictly lock the vanishing point (inject Depth/Canny/camera conditioning like Video-Depth-Anything or a low-poly 3D road guide), and calibrate clip frame counts so pavement scrolls at a constant 80 km/h. ControlNet passes or Wan 2.1/LTX alternatives welcome.
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