Klayout 25d View Jun 2026

Assumes vertical, Manhattan-style sidewalls for extruded shapes. It places flat layers on top of each other using specific height and thickness values.

It cannot simulate actual fabrication topology (e.g., oxide thickness, rounding). Comparison: KLayout 2D vs. 2.5D Perspective Top-down (plan view) Rotatable, semi-3D Use Case Layout design, DRC editing Congestion check, stackup inspection Performance High (handles millions of shapes) Medium (limits, 100k polygons) Complexity Requires scripting/stackup setup Conclusion

Mastering the KLayout 2.5D View: A Complete Guide to Enhanced Layout Visualization

The vertical thickness of the extruded polygon. Example Stack Configuration Table Layer Name GDS Number Elevation (µm) Thickness (µm) Description Active Silicon substrate active area Poly Transistor gate polysilicon Contact Vertical plug to Metal 1 Metal 1 First metal routing layer Via 1 Vertical plug to Metal 2 Metal 2 Second metal routing layer klayout 25d view

Each layer can be assigned an arbitrary height in the Z-dimension. By default, layers are extruded uniformly, but advanced users can script relative heights to mimic real dielectric thicknesses.

Configure the transparency of dielectric or filler layers to see the transistors and metal layers underneath.

Because the view relies heavily on OpenGL, graphics drivers can sometimes cause issues, such as the 2D layout disappearing in certain versions. Comparison: KLayout 2D vs

To bridge this gap, KLayout—the industry-standard open-source layout viewer and editor—offers a powerful feature. Unlike a fully rendered, resource-heavy 3D CAD environment, the 25D view provides a pseudo-3D perspective by extruding 2D layer geometries based on assigned height and thickness parameters. This article explores how to configure, utilize, and maximize the KLayout 25D view to improve your layout verification workflow. What is a 25D View?

Modern nodes rely on dense routing stacks. The 2.5D view allows you to visually audit your via stacks (e.g., verifying that Via 1 perfectly lands on Metal 1 and underlies Metal 2) without flipping back and forth between layer colors and visibility toggles. 2. MEMS and Photonics Verification

The is an essential tool for layout designers, engineers, and researchers who need to visualize the complex, layered nature of modern ICs without the overhead of full 3D simulation tools. By transforming a 2D layout into a manageable 3D stack, it empowers users to improve their debugging workflow and gain a deeper understanding of their physical design. By default, layers are extruded uniformly, but advanced

According to the official KLayout documentation , the provides a semi-3D representation of a layout. It is important to understand that this is not a full 3D rendering engine; it does not model complex physical process topologies, such as tapered vias or surface curvature (non-planarization).

For general layout engineers, the 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.