Klayout 25d View Here
The 2.5D view complements KLayout's robust cross-section tool. While the cross-section tool provides a strictly 2D slice view (essential for DRC checks), the 25D view allows the engineer to "fly around" the structure to understand spatial relationships in three dimensions instantly.
KLayout provides the 2.5D view as a built-in feature, accessible from the View menu or via a dedicated button in the toolbar. Upon activation, the main editing view transforms from a top-down orthographic projection to an angled view. Key configuration options include:
These settings are fully interactive; the user can zoom into a specific via array, tilt the view to check alignment, and then switch back to standard top-down editing with a single click.
The magic of the 2.5D view lies entirely in layer properties. KLayout does not know that Metal 1 is 0.1µm thick and Metal 2 is 0.2µm thick by default. You have to tell it.
The KLayout 2.5D View is a highly effective, cost-efficient solution for physical design verification. It moves the designer beyond the abstraction of GDSII layers into a representation of physical reality.
For general layout engineers, the Cross-Section View is the most valuable tool for verifying process geometry. The 3D Viewer serves as an excellent communication tool for design reviews and packaging verification. While it does not replace process simulation tools, it is an indispensable part of the open-source IC design ecosystem.
Recommendation: Users are advised to maintain accurate layer mapping files (.lyp or tech files) that include thickness data to maximize the utility of this feature.
The 2.5D View in KLayout is a feature that takes your 2D layout and extrudes it into a 3D-like representation by assigning thickness (height) and vertical positions (z-start) to specific layers. klayout 25d view
To "generate a piece" or see your design in this view, you typically need to follow these steps: 1. Enable the 2.5D Feature
The 2.5D view is only available if your version of KLayout was compiled with OpenGL support. Go to Tools > 2.5D View.
If the menu is missing, you may need a different installation (like the Ubuntu binaries which usually include it) or a custom build. 2. Create a 2.5D Script
KLayout doesn't know the "height" of your GDS layers automatically. You must define a material stack using a script. Navigate to Tools > 2.5D View > New 2.5D Script.
The script uses a syntax similar to Design Rule Check (DRC). Example Script Snippet:
# Define layer 1/0 as a 0.5um thick piece starting at z=0 l1 = input(1, 0) display(l1, "Layer 1", 0.0, 0.5) # Define layer 2/0 starting on top of Layer 1 (z=0.5) with 1.0um thickness l2 = input(2, 0) display(l2, "Layer 2", 0.5, 1.0) Use code with caution. Copied to clipboard 3. Generate the View
Click the Run button (green arrow) in the Macro Editor where you wrote your script. These settings are fully interactive; the user can
A new window will pop up showing your 2D shapes as 3D blocks. Pro-Tips for "Generating a Piece"
Performance: The viewer works best for small areas (around 100k polygons max). If your layout is huge, zoom into a specific "piece" or area before running the script. Navigation: Right-click + Drag: Rotate the view. Middle-click + Drag: Pan. Mouse Wheel: Zoom.
Visualization: You can even export net traces into the 2.5D view to see how a specific electrical signal travels through the vertical stack.
Do you have a specific layer stack or process technology you're trying to model in 3D? Colors in the 2.5d View - KLayout Layout Viewer And Editor
While there is no single academic "paper" exclusively dedicated to the KLayout 2.5D view
, this feature is a significant part of the KLayout open-source project, which is frequently cited in research involving layout verification and Electronic Design Automation (EDA). Key Technical Documentation and References
For technical details equivalent to a white paper, you should refer to the following official resources: Official Documentation Open your GDSII or OASIS file ( File > Open )
: The most comprehensive guide on how the tool functions, including the use of Design Rule Check (DRC)
scripts to define material stacks for extrusion, is available on the KLayout 2.5D View Documentation Relevant Academic Paper
: For a broader look at KLayout’s role in layout verification, the paper "Layout Verification Using Open-Source Software"
(ACM, 2024) discusses using KLayout for DRC and LVS checks, which are the foundational technologies the 2.5D view relies on for generating scripts. API Reference
: Developers looking for the internal implementation can find it in the Class D25View API , which was introduced in version 0.28. Core Features of the 2.5D View : It is an extruded 2D view
rather than a true 3D modeler. It uses a script (a variant of a DRC script) to import polygon layers, extrude them, and place them on specific Z-levels. Requirements : To use this view, KLayout must be compiled with OpenGL support Performance : It typically handles up to 100k polygons effectively before performance limitations occur. Integration : Users can export structures from KLayout to tools like 3D-FDTD for component simulation
to move from a visual representation to physical simulation. DRC-style script to help you set up your first 2.5D material stack? The 2.5d View - KLayout Layout Viewer And Editor
Open your GDSII or OASIS file (File > Open). Ensure you have a technology file loaded (.lyp or .lyt) so layers have proper colors and names, though this isn't strictly required.