BricsCAD Viewport Scale: Set and Verify CAD Scales in Layouts
Viewport scale controls how Model Space is shown through a BricsCAD Layout. Setting it correctly lets the sheet itself remain at 1:1 while different views use different engineering or architectural scales.
Beginner takeaway: Set the viewport scale, verify it, then lock the viewport before final plotting.
What you need to understand first
The most common beginner mistake is adjusting the Page Setup or title block when only the model view inside the viewport needs to change.
- A Layout can contain one or more viewports with different scales.
- The Layout output remains at real paper size while viewport content is scaled.
- A locked viewport prevents accidental zooming from changing production scale.
Related guides: How to Plot a BricsCAD Layout at 1:1 Without Changing Viewport Scale, Viewport Scale in AutoCAD & CAD, and How to Lock a Viewport in AutoCAD.
Step-by-step workflow
Step 1 — Open the Layout
Where: Layout tab
Do this: Confirm the sheet/title block is already the correct physical size.
Check: Paper-space geometry is not being used to compensate for a wrong viewport.
Step 2 — Select the viewport
Where: Click viewport boundary
Do this: Open Properties or the viewport scale control.
Check: You are editing the viewport, not model geometry.
Step 3 — Choose the intended scale
Where: Viewport scale property/control
Do this: Select or enter the required scale.
Check: The model view changes while the paper sheet stays fixed.
Step 4 — Frame the view without changing scale
Where: Pan inside the viewport carefully
Do this: Center the content after setting scale.
Check: The intended area is visible at the same scale.
Step 5 — Lock and verify
Where: Viewport properties > Display Locked / equivalent control
Do this: Lock the viewport and verify one known dimension after plotting.
Check: Accidental zoom no longer changes the issue scale.
What usually goes wrong
| What you see | Likely layer | First check |
|---|---|---|
| Scale keeps changing | Viewport unlocked | Lock after setup. |
| One viewport is wrong | Viewport-specific setting | Check only that viewport. |
| Paper size changes instead | Editing Page Setup | Return to viewport properties. |
| Annotation looks inconsistent | Annotation/viewport scale interaction | Check annotative settings separately. |
Practical example
An A1 sheet contains a plan at 1:100 and a detail at 1:20. Keep the Layout at 1:1, set each viewport independently, pan to frame the views, then lock both. One Page Setup can output the complete sheet without changing either viewport scale.
What not to do
- Do not zoom freely inside a production viewport after setting its scale.
- Do not change Page Setup plot scale to create a viewport scale.
- Do not assume two viewports share the same scale just because they are on one Layout.
Good office standard
Templates should include clearly layered viewport boundaries and a policy to lock all production viewports after QA.
Quick verification before you move on
- Use one representative drawing or sheet, not a production batch.
- Verify page size, orientation and a known dimension.
- Compare Preview/PDF with the physical output when a printer is involved.
- Save the setting or set only after the result is repeatable.
Official references
Frequently asked questions
Can one BricsCAD Layout have different viewport scales?
Yes. Each viewport can show Model Space at its own scale while the sheet still plots at 1:1.
Why lock the viewport?
It prevents accidental zoom operations from silently changing the drawing scale.
Should I center the view before or after setting scale?
Set scale first, then pan to frame the view without zooming.
Explore more in BricsCAD Printing & Plotting Guide.