For gameplay programmers

Keep responsive feedback on the client and authority on the server.

Start from reusable Roblox foundations for grid placement, data, economy and UI, then apply your project's policies at the server boundary.

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Grid placement · explanatory diagram

Client previewSnap the placement ghost

Build.Grid.snaplocal plot grid

Server decisionRe-run the rules

Placement accepted

✓Footprint stays inside the plot

✓Target cells are available

✓Project policy approves the item

Build.Grid.snap(desc, worldPos, rotSteps)BuildServer.place(player, plot, objectId, col, row, rotSteps)

Switch scenarios to inspect the responsibility boundary. This interactive diagram explains the shipped API pattern; it is not a recorded game run.

Actual API shape

Preview, request, validate, place.

The client snaps a ghost in the plot's local frame. The server re-runs the grid rules and returns occupied, out_of_bounds or your policy's reason when placement is denied.

Grid Builder Player Data Economy

Grid Builder · README API shapeRoblox

-- client: preview in the plot's local grid
Build.Grid.snap(desc, worldPos, rotSteps)

-- server: validate and own occupancy
BuildServer.place(player, plot, objectId, col, row, rotSteps)