Klayout 25d View | SIMPLE |

Navigate to View > New 2.5D View. A separate window opens, initially showing your layout as a flat, extruded landscape. Use the mouse:

The KLayout 2.5D view is not a gimmick; it is a pragmatic debugging scalpel. While you will never replace the precision of DRC/LVS with a 3D visual, the human brain is wired to spot spatial anomalies instantly.

By spending 10 minutes configuring your layer heights and learning the camera controls, you transform KLayout from a static plotting tool into a dynamic visualization engine. Whether you are verifying a MEMS device, a Silicon Photonics chip, or a standard CMOS block, the "2.5D view" brings your layout to life—literally lifting your polygons off the screen to reveal the true vertical complexity of your design.

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You’ll never look at a flat GDS the same way again.

Have you used KLayout’s 2.5D view for a specific MEMS or RFIC design? Share your layer height strategies in the community forums.

Analog and mixed-signal layouts often require substrate contacts and guard rings. In 2.5D view, one can easily see whether a guard ring fully surrounds a sensitive block across all relevant layers, as the extruded rings appear as walls enclosing the region.

For decades, integrated circuit (IC) and microelectromechanical systems (MEMS) designers have relied on two-dimensional (2D) tools to create complex physical layouts. KLayout, the open-source, high-performance layout viewer and editor, has become an industry favorite precisely because of its lightning-fast 2D rendering and robust polygon manipulation. However, as semiconductor technology pushes into advanced nodes (5nm, 3nm) and heterogeneous integration (chiplets, TSVs, and MEMS structures), the limitations of flat, top-down viewing become painfully apparent.

This is where the 25D view—often called "2.5D"—enters the workflow. In KLayout, the 25D view is not merely a cosmetic gimmick; it is a critical analytical tool that provides depth perception, vertical layer relationships, and structural intuition without the computational overhead of full 3D modeling. klayout 25d view

This article explores what the 25D view is, how KLayout implements it, its practical applications in tape-out and debugging, and why it is an essential feature for modern layout engineers.

The 2.5D view in KLayout bridges the gap between traditional layout editing and physical intuition. It won’t replace Calibre for signoff or a full 3D EM solver, but for daily debug, team reviews, and quick sanity checks, it offers an invaluable new angle—literally.

So next time you’re hunting for a mysterious short or explaining your floorplan to a colleague, tilt your view, extrude those layers, and see your design rise off the plane.

Have you integrated 2.5D view into your KLayout workflow? Share your tips or questions below.

allows you to visualize a 2D layout in 3D by extruding layers vertically based on a script

. This is particularly useful for verifying material stacks, such as MEMS devices or CMOS metal layers. 1. Prerequisites OpenGL Support

: KLayout must be compiled with OpenGL support for the 2.5D viewer to work. Performance Limits

: It is optimized for small to medium designs; a practical limit is roughly 100,000 polygons Layout Setup : Ensure you are in Editor Mode if you need to create or modify layers first. 2. Getting Started Navigate to View > New 2

To generate a 2.5D view, you need a script that defines the material stack using a specialized version of the KLayout DRC language Navigate to New 2.5d Script This opens the Macro Editor with a template script. Define your layer stack using the functions. 3. Scripting Basics The script tells

how high each layer should be extruded and at what starting point in the Z-axis z(layer, options) : Extrudes a specific layer. : The elevation where the extrusion begins. : The thickness of the material. zz(options) block : Combines multiple

statements into a single display group for complex material geometries. Example Script:

# Extrude Layer 1/0 starting at Z=0.1um with a thickness of 200nm ), zstart: .um, height: # Extrude Layer 2/0 for 300nm on top of previous layers ), height: Use code with caution. Copied to clipboard 4. Running the View : Click the button in the Macro Editor or select your script from the Window Management

: Once run, the 2.5D window will pop up. If closed, re-open it via Open Window Visibility Follows Selection

: You can enable this option in the viewer settings to only show the 3D extrusion of parts you have selected in the 2D layout. 5. Troubleshooting Script not showing in menu

: Check if the script is configured to be "bound to a menu item" in the Macro Development environment Window is blank : Ensure your

values are not zero and that you have valid shapes on the specified input layers. complex script example involving multiple material groups or specific 3D navigation shortcuts? The 2.5d View - KLayout Layout Viewer And Editor You’ll never look at a flat GDS the same way again

allows you to visualize 2D layouts as extruded 3D objects, providing a clearer perspective on layer stacks and connectivity. Accessing the 2.5D View Open your layout in the KLayout Editor Navigate to the to open the visualization in a new tab. Navigation Controls The view uses camera-based movement relative to a pivot point (marked by a compass icon): Rotate (Azimuth/Elevation) Right-click + Drag Move Pivot (Up/Down/Left/Right) Middle-click + Drag Move Pivot (Forward/Backward) Mouse Wheel Zoom (Magnify/Shrink) + Mouse Wheel Top-Level View Toggle Keyboard Panning Arrow Keys Keyboard Rotation + Arrow Keys Key Features

: The 2.5D view automatically extrudes the 2D shapes based on layer definitions. Net Tracing Integration

: You can export specific nets from the Net Tracer and visualize them in 2.5D to inspect complex routing, such as a VDD net. Visibility

: Like the standard 2D view, you can adjust layer visibility and order to focus on specific parts of the stack. Tips for Better Visualization Database Units

: Ensure your database units are set correctly in the initial layout setup, as this affects the scale of objects. Layer Properties : You can adjust layer textures and colors in the Layer Toolbox

to make different materials more distinguishable in the 2.5D rendering. Performance : If the layout is extremely complex, use the Cell Hierarchy

to show only specific cells as "top" to improve rendering speed. for the 2.5D extrusion or how to export these views as images? Colors in the 2.5d View - KLayout Layout Viewer And Editor

Chemical Mechanical Polishing (CMP) requires uniformity. In a 2D layout, it’s hard to gauge density variation. The 25D view, when colored by layer height, gives a pseudo-topographic map. Rapidly alternating tall and short metal regions (poor density) looks like a mountain range, prompting dummy fill insertion.

When training new layout engineers, it is difficult to explain that a "Contact" is a hole in the oxide, not a physical block. In 2.5D, you can set the "Implant" layer to height 1, "Oxide" to height 10 (transparent), and "Contact" to height 11. The student literally sees the contact piercing the oxide.