Start a new empty model (replaces the open one; models autosave).

Open a previously saved model by name.

List saved models.

List the curated parts (brick, plate, tile, slope, round, misc) with their size, or search the whole LDraw library by words in the part title (e.g. 'window 1 x 2'). Size is studs along x x studs along z at rot 0, and height in plates.

List LDraw colours (code, name, hex). Solid colours only unless include_special.

Place one or more parts. Parts that collide or are invalid are skipped and reported; the rest are placed. Returns the new part ids.

Remove parts by id and/or every part touching an inclusive grid region.

Build volume from colour maps, automatically packed into bricks/plates/tiles.

layers: bottom-to-top list of layers; each layer is a list of equal-length rows seen from ABOVE, first row = back, last row = front. Each character is a cell of 1 stud; '.' = empty. legend maps characters to colours, e.g. {"R": "Red", "W": 15}. Each layer is one brick (3 plates) or one plate tall depending on kind; layer i sits at y + i*height. (x, z) is the front-left corner of the map.

upright=True: each layer is instead a front-facing wall picture (first row = top, last row = bottom), one course per row, at depth z + layer index. Handy for mosaics and facades.

Cells already occupied are skipped. Seams are staggered between courses.

Downsample a picture into rows of colour letters using LEGO colours, ready for fill_layers. crop = [left, top, right, bottom] fractions (0-1) to focus on the subject. cell sets the cell's aspect ratio when height is omitted: 'stud' for top-down maps, 'brick' or 'plate' for upright walls. Transparent pixels become '.'.

Build a picture directly as a mosaic in the current model. upright: a wall facing the front, 1 stud deep (kind=plate gives fine vertical detail, kind=brick is sturdier). flat: lying on the ground, one plate thick, image top = back.

Undo the last building action.

Summarise the model: bounds, part counts, and top-down colour maps of plate levels (first row = back, last = front; uppercase letters = colours in the legend). Maps are shown for levels, or every level when all_levels is set.

Check structure: floating groups (not connected to anything touching the ground) and loose groups (standing on the ground but not attached to the main body).

Render a preview sheet. views: any of front, back, left, right, top, iso_front_left, iso_front_right, iso_back_left, iso_back_right, or 'azimuth,elevation' in degrees. Default: iso_front_left, iso_back_right, front, top. reference_image adds the source picture as the first panel for side-by-side comparison. Parts are simplified (round parts and non-catalog parts show as boxes).

Write the model as an LDraw .ldr file (one build step per level). Import it in Mecabricks via Workshop > File > Import. If some parts come in missing, re-export with legacy_ids=True (uses e.g. 3023 instead of 3023b).