Open Arsenal

There are no shortcuts past physics.

Reality Pass is an open-source, physics-first space simulation platform designed to let users build, test, and experience spacecraft systems before they are ever constructed in the real world. It functions as a pre-reality engineering environment, where creativity is unrestricted but every design must ultimately obey real physical laws. If a system violates orbital mechanics, thermodynamics, structural limits, or radiation constraints, the simulation does not approximate failure, it fully resolves it, allowing users to see exactly how and why a concept would succeed or catastrophically fail.

At its core, Reality Pass combines a high-fidelity, deterministic physics engine with an AI-assisted co-design system. The AI acts as a collaborative engineering partner, analyzing designs in real time, identifying physical inconsistencies, and suggesting viable alternatives grounded in real aerospace principles. Rather than replacing engineering thinking, it reinforces it by making tradeoffs explicit, mass versus durability, power versus thermal limits, and efficiency versus structural safety.

A defining feature of Reality Pass is its immersive VR consequence layer. Once a design is validated through simulation, users can step into a fully realized virtual environment to observe mission outcomes over time. This includes time-compressed mission playback, where years of orbital behavior, structural stress, or system degradation can be experienced in minutes. Failures are not abstract—they are observable, interactive, and physically consistent, giving users a deeper understanding of system-level behavior.

Reality Pass also supports collaborative engineering through two-player and multi-role simulation modes. Users can work together as mission planners, systems engineers, propulsion specialists, or structural analysts, mirroring real-world aerospace team dynamics. Combined with deterministic simulation replay, version control for designs, and open plugin architecture, Reality Pass becomes not just a simulator, but a shared engineering ecosystem for exploring the future of space infrastructure.

This specification is released under the GNU Affero General Public License v3.0 or later (AGPL-3.0+) and may be used freely with required attribution under Section 7. A Specification Branding License is available for attribution-free deployments, with fees based on usage, scope, and deployment size.