Design Nomenclature / Digital Model Making
Trim Sheet
Also called trim texture, trims
A single texture holding a strip of reusable details — panel edges, mouldings, plates, seams — which geometry is mapped onto by sliding UV shells over the strip rather than unwrapping each piece uniquely. One material and one draw call can carry a whole environment. It forbids anything genuinely unique.
In practice
Not a tiling texture (which repeats in both axes) and not an atlas (which is only packing). A trim sheet is authored at fixed proportions and tiles in one direction.
Not to be confused with
- TilingBuilding a texture so that opposite edges match, letting it repeat over an unbounded surface from a small map. The technical requirement — edge continuity — is easy. The design requirement is not: any distinctive mark becomes a visible lattice at the repeat interval, and that lattice is what the eye actually finds.
- UV UnwrapAssigning every vertex a coordinate in a 2D texture space so the surface can be laid flat and painted. Anything curved in two directions must be either cut or distorted — this is the cartographer's problem, and there is no solution, only a choice. The cuts are seams; the flattened pieces are islands.
- UDIMA convention spreading one surface's UVs across a grid of numbered unit squares, each carrying its own texture file. The tile is encoded in a four-digit number, so 1001 is the first square and 1011 is ten across. It buys resolution without one enormous map, if every tool in the chain understands the scheme.