A watertight mesh has no open boundary edges, so its surface encloses an inside and outside volume.
- Boundary holes
- None
- Encloses
- A volume
- Important for
- 3D printing and solid operations
- Not equal to
- Printable
A stack of checks, not one badge
After closing boundaries, test manifoldness, self-intersections, normals, wall thickness, disconnected shells, and real-world scale.
Open-surface generation versus solid fabrication
TRELLIS.2 is designed to represent open and complex surfaces. That flexibility is different from guaranteeing a closed solid, so printing workflows need explicit repair and validation.