Itasca Mesh Viewer

Interactive VS Code viewer for Itasca FLAC3D/FLAC2D grids, built on VTK.js.

Features

• Custom editor for .f3grid, .f2grid, .grid (FLAC3D/FLAC2D), plus .obj and .stl
• VTK.js 3D rendering: surface, wireframe, and edges
• Correct FLAC to VTK cell node ordering (B8, B7, W6, P5, T4, Q4, T3)
• Per-zone colors, with cells colored by FLAC ZG zone groups when defined
• Zone-group legend in the top-right showing group name, slot, and matching color
• Element edge overlay: draws the edges of each zone cell (not triangulation diagonals)
• Live refresh when the file is saved
• Info panel: vertex count, zone count, and bounds

Supported Formats

FLAC grids (.f3grid, .f2grid, .grid)

The parser reads the native ASCII grid records:

FLAC zone nodes are reordered to VTK node order before rendering. A 7-node B7 zone is expanded to the 8-node hexahedron VTK expects, matching FLAC's DBrick handling.

Examples: examples/brick.f3grid, examples/tunnel.f3grid.

Other meshes

.obj and .stl are also supported.

Controls

Usage

Open a supported file in VS Code and it opens in the Mesh Viewer editor. The camera frames the model, and the info panel in the top-left shows:

Vertices: N | Zones: N | Groups: M
Bounds: X x Y x Z

Groups is shown only when the file defines ZG zone groups; cells are colored by group, falling back to per-zone colors for ungrouped zones.

When zone groups exist, a legend in the top-right lists each group name and slot (for example GroupA [SlotOne]) with its color. Group and slot names may contain spaces, e.g. ZG "Block 1" SL "Slot A" or ZG Block 1 SL Slot A.

The controls hint stays in the bottom-left.

Installation

Install from the VS Code Marketplace or from a .vsix package.

Support

If you find this extension useful, consider donating:

See CHANGELOG.md for release notes.

License

MIT