Hi everyone,

I am writing this to initiate a formal, in-depth discussion regarding the long-term feasibility of integrating a native Rigid-Fluid Coupling framework into the core engine of The Powder Toy. Over its extensive development history, TPT has consistently broken the boundaries of what a grid-based sandbox can achieve. However, the structural disconnect between rigid bodies and fluid dynamics remains a major limitation of the physics engine.

As it stands, the current simulation model enforces a strict division between solid components and ambient liquids or gases. The underlying engine processes these entities almost in complete isolation from one another. Kinetic momentum, hydrostatic forces, and vector-based interactions between the solid structures and fluid elements do not translate fluidly. This lack of native communication between the two states of matter severely limits the scope of high-level physical simulations within the sandbox.

I would greatly appreciate getting the core development team's and the community's technical insights on this concept. Is a unified rigid-fluid coupling system something that could realistically be experimented with in future development snapshots, or are there fundamental, immutable architectural constraints within the current codebase that would completely prevent this type of cross-state physics calculation?Thank you for your time, and I look forward to hearing your thoughts.