Klayout 25d — View

zz([options]) block : Groups multiple z statements to create complex 3D material geometries.

height = 0 if name.include?("metal2") height = 60 elsif name.include?("metal1") height = 30 elsif name.include?("poly") height = 10 elsif name.include?("via") height = 20 end

This will open KLayout's built-in , where you will write your script in the DRC language.

Before clicking buttons, let’s clarify the terminology. A true 3D view requires volume rendering (height, width, depth). KLayout does not natively do this because it is a layout tool, not a mechanical CAD tool.

The most critical prerequisite is that your version of KLayout must be and your hardware must support it. This is because all 3D rendering is handled via OpenGL. If you've built KLayout from source and the 2.5D view option is missing from your "Tools" menu, a missing OpenGL dependency is the most likely culprit. Using a pre-built binary from the official KLayout website is the safest way to ensure this feature is available. klayout 25d view

The 25D view is not a full solid-modeling engine like those found in mechanical CAD software. Instead, it takes 2D polygons from your GDSII or OASIS layout files and projects them vertically along the Z-axis. Key Advantages

This guide will provide a deep dive into the 2.5D view, from its core definition and practical applications to the intricacies of creating and managing these visualizations. Whether you are debugging a complex wiring issue or presenting a design to a team, this feature will transform your analysis workflow.

In the Layers palette, layer order matters. Ensure metal layers are layered appropriately to represent their real-world stacking.

Unlike a true 3D CAD model that uses complex solid geometries (like voxels or boundary representations), a 25D engine simply extrudes 2D polygons along the Z-axis. It gives the illusion of 3D depth, which is perfectly suited for semiconductor manufacturing stacks where layers are deposited sequentially on top of one another. Why Use 25D View in KLayout? zz([options]) block : Groups multiple z statements to

The utility of the 2.5D view has spurred community interest in expanding its capabilities. Active feature requests include:

: Drag with the middle mouse button to pan the view or use the arrow keys .

In a 6-layer metal process, verifying that a signal path from Metal 1 to Metal 4 uses the correct sequence of vias is tedious in 2D. The 2.5D view makes it visually obvious if a via is missing or misaligned, as the vertical pillar connecting two plates will appear broken.

Before you can use the 2.5D view, you need to ensure your system is properly set up. The most critical requirement is . KLayout must be compiled with OpenGL to enable this feature, and your graphics drivers must be compatible. Some older systems or configurations (like older macOS versions with OpenGL 2.1) have historically required a minimum of OpenGL 3.0 or newer , though modern versions of KLayout are more compatible. Pre-built installers from the official KLayout website usually include this support out of the box for Windows, Linux, and modern macOS systems. If you're compiling from source, it's crucial to enable OpenGL dependencies during the build process. A true 3D view requires volume rendering (height,

In the context of Electronic Design Automation (EDA), "25D" (or 2.5D) refers to a visualization method where 2D polygons are extruded vertically based on a assigned "height" and "thickness." Unlike a true 3D engine that accounts for physics, deposition, and etching angles, KLayout’s 25D view is a geometric extrusion.

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.

: It is currently optimized for sections of a layout, with a practical limit of roughly 100k polygons .