11.2 Layouts & Viewports

Every AutoCAD drawing has exactly one Model space and, typically, one or more Layout tabs. Model space is where all real design geometry lives, drawn at true, full-scale, real-world size — a wall really is drawn 8 feet tall, a bolt really is drawn 0.25 inches in diameter. Layouts represent paper space: a simulated sheet of paper, sized to a real paper format like Letter or ANSI D, onto which you arrange one or more viewports — windows that look into model space — at whatever scale is needed so the final printed sheet makes sense. Understanding this split, and how to move between the two, is one of the most heavily tested practical skills on the ACU AutoCAD exam.

Model Space vs. Paper Space

Think of model space as the workshop where the actual design is built at true size, and a layout as a presentation board where photographs of that workshop — taken at chosen zoom levels — are pasted down next to a title block and notes. The geometry itself never physically changes between the two; a layout viewport is simply a window showing a live view of the same model, at a scale that the viewport controls independently of the model's true size.

A drawing can contain any number of layouts — one drafter might set up a "Floor Plan" layout at one scale and an "Elevation" layout at another, all viewing the same shared model-space geometry, so that a single drawing file produces multiple different plotted sheets.

Activating a Layout

Layout tabs run along the bottom of the drawing window, next to the Model tab. Clicking a layout tab activates that layout, switching the entire drawing display into paper space: the crosshair now interacts with the paper-space environment, and any viewports on that layout show their respective views into the model. Right-clicking a layout tab exposes options to create a New Layout, rename it, delete it, move or copy it, or run Page Setup Manager directly — all without leaving the layout tab context.

A newly created layout starts essentially blank aside from a default page setup; if no viewport already exists, model-space geometry will not be visible on the sheet at all until at least one viewport is created.

Creating and Sizing Viewports

The MVIEW command (Make View) creates layout viewports, and the Layout ribbon tab's Viewport panel exposes the same functionality through buttons rather than command-line typing. The most common workflow is:

1. Activate the layout
2. Run MVIEW (or pick a Viewport preset from the ribbon)
3. Specify two corners to define a single rectangular viewport, or choose an option to automatically divide the layout area into 2, 3, or 4 viewports in one step, or select Polygonal to draw a viewport with a non-rectangular, custom outline

Once created, a viewport is itself an object that can be selected, moved, and resized like any other paper-space entity — dragging its grips changes its size and position on the sheet, and it can be deleted with ERASE like anything else. Multiple viewports can coexist on one layout, each independently framing a different area of the model, a different named view, or the same area at a different scale.

Activating and Exiting a Viewport

A viewport starts out inactive (locked to paper space) after creation — the border is visible, the model geometry shows through, but the crosshair still operates in paper space until you enter it. Double-clicking inside a viewport's boundary activates that viewport, switching into floating model space: the crosshair now behaves as if you were on the Model tab, letting you pan, zoom, select, and edit the actual model geometry, all while still visually sitting on the layout sheet. The status bar's PAPER/MODEL toggle button reflects this state and can also be clicked directly to switch between paper space and the active viewport's model space.

To return to paper space, double-click outside any viewport, on the blank paper area of the layout, or click the status bar toggle back to PAPER. Only one viewport can be active (in floating model space) at a time; clicking into a different viewport while one is already active switches the active viewport to the one just clicked.

Basic Viewport Locking

Each viewport carries a Display Locked property, accessible from the Properties palette or by right-clicking the viewport border and choosing Display Locked > Yes. When locked, panning or zooming while inside that viewport (in floating model space) is disabled, which prevents an accidental zoom from silently changing a carefully established plot scale. Locking does not prevent editing the model geometry itself, and it does not affect the viewport's size or position on the layout — only the zoom/pan state of the view it displays.

Viewport Layer Visibility (VPLAYER Basics)

Because each viewport is an independent window into the same model, layers can be frozen per viewport rather than globally. Selecting a viewport and using the Layer Properties Manager's VP Freeze column (or the VPLAYER command) freezes a layer's visibility only within that specific viewport, leaving the same layer visible in every other viewport and in model space itself. This is how a single model supports one layout showing dimensions and another layout hiding them, without maintaining two copies of the geometry.

On the Exam

Expect scenario questions asking what happens when double-clicking inside versus outside a viewport, what MVIEW's multi-viewport options produce, and basic recognition of the model-space/paper-space distinction — including which space real, full-scale geometry belongs in. Viewport Display Locked is also commonly tested as the safeguard against accidental scale changes.