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simgrammar the grammar of simulation

mechanism

The host game renders normally and streams its frames to a video-to-video diffusion model. Each output frame is conditioned on the current input frame, a window of recently generated frames, and a text prompt; Diffusion Forcing and history augmentation keep the stream from drifting, and distillation, pruning, and custom GPU kernels bring response under 40 ms at 24 fps. Because the model only replaces pixels, collision, inventory, and world state stay in the host engine. Decart's Oasis 2.0 packages this as a Minecraft mod with chat commands and command-block hooks that switch the prompt.

limitations

  • Short frame window and no long-term memory, so restyled objects can change appearance between views.
  • Rendered detail can contradict game state (a block that looks like a door but is solid), hurting legibility.
  • Cloud-served stream adds network latency and per-player GPU cost; no price per hour is published.

relations

4 stored edges
affects

Generative content on demand

Players or in-world logic change the whole world's look at runtime by text, without new textures or models; the game's systems cannot read the new look, so it carries no gameplay meaning.

Enables new form
affects

Procedural build assist

Blocky player builds are rendered as detailed structures in a prompted style (for example Roman), a visual-only form of build assist: collision and block state stay coarse while the view is detailed.

Enables new form
deployed in

claims

2 with sources
c01high

MirageLSD responds in under 40 ms per frame at 24 fps, conditioning each frame on recent output, the current input frame, and a prompt; Decart lists limited memory, weak control of specific objects or regions, and structure distortion under extreme style shifts.

src-decart-2025-miragelsd

c02high

Oasis 2.0 is a Minecraft 1.21.8 mod that restyles the player's world in real time from prompts set by chat command or by in-world command blocks.

src-decart-2025-oasis-2

sources

2

provenance

runs in log/runs
2026-10-24
created2026-10-24-techniques-world-modelstechnique