Parametric design continues to evolve rapidly, and LusoCAD is driving that evolution with powerful constraint-based tools, offering engineers, designers and drafters precise control over geometry. With the launch of LusoCAD 2025 and the expansion of resources in the LusoCAD 2026, With the help of the new design tool, users can automate drawing behaviours, maintain geometric relationships and create smarter workflows.
Below is a complete summary of the new features, the function of each constraint and how these tools optimise the parametric process.
LusoCAD 2025: Introduction to Parametric Geometric Constraints
LusoCAD 2025 presents the first phase of its parametric system, bringing 12 types of geometric constraints. These restrictions define how objects relate to each other, allowing the drawing to adjust automatically whenever changes are made.
The 12 Types of Geometric Constraints
Each restriction corresponds to a specific geometric relationship:
- Coincidental
- It makes two points coincide or forces a point to remain on an object or its extension.
- Collinear
- Ensures that two lines are on the same infinite line.
- Concentric
- It makes circles, arcs or ellipses share the same centre.
- Fixed
- Locks a point or curve in a fixed position in relation to the Global Coordinate System.
- Parallel
- Keeps two lines always at the same angle.
- Perpendicular
- Maintains a 90° angle between two lines or polyline segments.
- Horizontal
- Keeps lines or pairs of points parallel to the X axis of the current UCS.
- Vertical
- Keeps lines or pairs of points parallel to the Y axis of the current UCS.
- Tangent
- It ensures that two curves have a point of tangency between them or between their extensions.
- Smooth
- It maintains G2 continuity between one spline and another curve, resulting in a smooth and fluid transition.
- Symmetrical
- Keeps two objects or points symmetrical in relation to a selected line.
- The same
- It keeps lines or segments of the same dimension, or ensures that arcs and circles have the same radius.
Managing Geometric Constraints
Geometric restrictions allow automated control: when you modify an object, all related objects are automatically updated.
You can adjust the behaviour and the way restrictions are displayed by:
- CONSTRAINTSETTINGS
- Restriction Definitions (button on the interface)
This allows you to customise icons, visibility, style and other options.
LusoCAD 2026: Phase 2 - Dimensional Constraints + Parameter Manager
In 2026, LusoCAD expands the parametric system with dimensional restrictions and the new Parameter Manager, offering complete parametric intelligence to the project.
The 7 Types of Dimensional Restrictions
Dimensional restrictions define sizes, distances and angles with mathematical values.
- Linear
- Controls horizontal or vertical distances between points.
- Horizontal
- Controls the distance on the X axis between points on the same or different objects.
- Vertical
- Controls the distance on the Y axis between points.
- Aligned
- Defines the true distance between two points, regardless of direction.
- Lightning
- Restricts the radius of circles or arcs.
- Diameter
- Restricts the diameter of circles or arcs.
- Angular
- Control:
- the angle between lines or polyline segments
- the sweep angle of an arc
- the angle formed by three points
- Control:
Auxiliary Tools for Dimensional Restrictions
LusoCAD 2026 introduces two important additional features:
Convert Quotas to Restrictions
Transforms traditional dimensions into active dimensional restrictions - ideal for making existing drawings fully parametric.
Change Restriction Mode (Dynamic vs. Annotative)
Dynamic Restrictions
- They don't appear in the plots
- They don't have styles
- Ideal for internal design control
Annotative Restrictions
- They can be stylised as normal dimensions
- They are visible in print
- Completely configurable quota styles
Parameter Manager: The Brain of the Parametric System
The new Parameter Manager centralises the management of parameters and formulas. With it, you can:
Rename Restrictions
Organise the project with clear and meaningful names.
Creating Expressions and Equations
Replace numerical values with mathematical formulae.
For example:
Set the diameter of the second circle to twice the radius of the first circle.
Once set, this ratio remains constant - changing one value automatically updates the entire system.
You can also change the display format of the restrictions in the Restriction Definitions.
Conclusion
With LusoCAD 2025 and 2026, parametric design becomes more powerful and accessible than ever. Geometric constraints establish relationships, dimensional constraints define values, and the Parameter Manager connects everything through intelligent equations.
Use dimensional constraints and the Parameter Manager to ensure accuracy, automate repetitive tasks and create parametric workflows that automatically adapt to project changes.
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