While impressive, the 25D view has specific limitations that users must understand to avoid errors.
Do not render an entire 10mm x 10mm microprocessor in 25D. Zoom into a specific area of concern—such as an ESD protection circuit, an array of TSVs (Through-Silicon Vias), or a specific photonics coupler—and render only that specific bounding box. 2. Adjust the Z-Axis Scaling (Z-Scale)
to make different materials more distinguishable in the 2.5D rendering. Performance : If the layout is extremely complex, use the Cell Hierarchy klayout 25d view
Run this script, and your 2.5D view configures itself instantly.
In KLayout, the (often provided by the "XSection" plugin) typically generates a static 3D model of a small slice of the layout. The 2.5D View is usually a more interactive, global view of the entire chip or a large area, making it better for general inspection rather than detailed process verification. Quick Tips for Setup While impressive, the 25D view has specific limitations
It's called 2.5D because the extrusion is simple: a layer is taken as a flat 2D polygon and pulled straight up to a given height. It does not model complex 3D topography like sloped sidewalls or conformal coatings. It's a "prism" view, not a full solid model.
Integrated circuit (IC) and micro-electromechanical systems (MEMS) designs are inherently three-dimensional. However, traditional Electronic Design Automation (EDA) layout tools restrict engineers to a flat, two-dimensional top-down perspective. This creates a critical gap between design intent and physical reality. In KLayout, the (often provided by the "XSection"
Unlike a true 3D tool that renders complex 3D meshes, "2.5D" implies a layered, top-down view where, while objects appear to have height, the underlying structure is still based on 2D planes stacked vertically. It is exceptionally useful for verifying that vias are correctly connecting intended metal layers. Why Use the 2.5D View?
Depending on the specific script or plugin you use, the execution varies slightly:
Avoid expensive third-party TCAD visualizers. KLayout renders 2.5D structures rapidly, directly within your active workspace. How to Set Up and Use the 2.5D View
KLayout is an indispensable open-source tool for integrated circuit (IC) layout editing and viewing. While its primary workspace operates in a traditional two-dimensional (2D) plane, the bridges the gap between flat shapes and physical reality. This feature allows engineers, mask designers, and researchers to visualize how their 2D layout masks translate into physical, stacked 3D semiconductor structures.