Snaptrude has three ways to divide geometry. Use Split to cut a space into smaller spaces by drawing across it. Use Split Face to divide one face of an object, for example to apply a different material to part of a wall. Use Split Volume to slice a mass horizontally into floors by height, by count or by your project's stories.

Tool	What it divides	Typical use
Split (draw tools)	A space, in plan	Divide a large floor plate into rooms or zones
Split Face	One face of an object	Partial-height finishes, roof ridges
Split Volume	A whole mass, horizontally	Turn a massing envelope into stacked floors

Split a space by drawing across it

You split spaces with the regular draw tools (Line, Rectangle, Arc and Circle), in Freeform and Offset draw modes.

In Design Mode, pick a draw tool, for example Line.
In the draw options, turn on Split the space on overlap.
Draw across the space, from one edge to another. Type lengths for accuracy.
Finish the line. The space is divided along your sketch, and each piece becomes its own space.

You can also split with a closed loop drawn inside a space, such as a rectangle or circle. Offset draw modes can split in 2D, which is useful for cutting a corridor of a set width through a space. Split and Split Face can be used on the same object.

Choose what a split creates

A toggle in the draw options sets what type of object the split pieces become. The first time you split, Snaptrude asks you to choose. You can change this later in the Properties panel.

Note: Area Lock does not support splitting.

Split a face

Split Face divides a single face into separate faces. It works on any face, whether horizontal, vertical or inclined, including faces that combine arcs and lines.

Select the Split Face tool.
Hover over the face you want to divide.
Click to start the split line on the face.
Click to add more points if you need a polyline. Type lengths in the input box, which accepts metric or feet-and-inches values.
Finish the line across the face.

After splitting, you can treat each part separately. For example, apply a different material to one part with Material by Face, or select a split edge with Push/Pull to raise a roof ridge.

Tip: To split a curved (3D arc) face, draw a single line perpendicular to the curve.

Split Face limits

A split line cannot cross an existing split line.
You cannot split a face with a closed loop. Use a line or polyline instead.
Splitting a face unlocks the object's height from its story height.
On walls created with Sketch to BIM, splitting a face turns parametric walls back into regular walls.

Remove split lines

Select the Erase Edge tool (E) from the top toolbar.
Click the split line you want to remove. The faces on either side merge back into one.

Split a mass into floors with Split Volume

Split Volume fits a "form first, floors later" workflow: shape a building envelope as one mass, then slice it horizontally into floors without redrawing anything.

Before you start

Select exactly one object. Split Volume works on a single selection only.
Splits are horizontal only. To divide a mass vertically, use Split or the Boolean Split operation.

Split by height or by count

Select the mass.
Click Split Volume.
Choose how to divide it:
- By height: enter the height of each slice. If the mass height is not an exact multiple, a leftover slice is created at the top.
- By count: enter the number of Divisions.
Choose whether the slices are Instance (linked copies) or Unique (independent objects).
Check the preview on the canvas, then apply the split.

Split by story

If your project already has stories set up, you can slice the mass so it lines up with them.

Select the mass and click Split Volume.
Turn on Split by Story.
Check the preview. The slices align to the heights of your configured stories.
Apply the split.

Note: When you split by story and the base of the mass sits between two stories, Instance is disabled.

Split other instances

If the mass you select is an instance, Split other instances is on by default, so every other instance is split the same way. Turn it off to split only the selected mass.

Limits

Setting	Limit
Maximum divisions as instances	300
Maximum divisions as unique objects	100
Minimum slice height	1/8" (about 3 mm)
Live preview	Up to 100 divisions

If you enter a value larger than the object allows, Snaptrude shows Value exceeds object height.

What happens after the split

The first split creates stories to match the slices.
A leftover slice at the top is always unique.

Troubleshooting

Split Volume isn't available: make sure only one object is selected.
Instance is greyed out: when splitting by story, the mass starts between two stories. Use Unique, or split by height instead.
Split Face won't cross a line: erase the existing split line first, then draw the new one.

Drawing and Editing Spaces
Boolean Operations
Working with Stories
Applying and Editing Materials
Creating Sloping Roofs
Copy Type Selector: Instance or Unique
Keyboard Shortcuts

Split Tools: Split, Split Face and Split Volume