View ~upd~ | Klayout 25d
The KLayout roadmap includes discussions about true 3D rendering using ray marching or voxel cones. However, the maintainers (notably Matthias Koefferlein) have been cautious due to performance concerns. Most users agree: the current 25D mode hits a sweet spot.
If you want to tailor this visualization to your workflow, tell me:
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).
zz(options) block : Groups multiple z statements into a single material for easier display management. klayout 25d view
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.
Generate intuitive, 3D-like screenshots for design reviews, documentation, and presentations with non-layout engineers.
Once the stack-up is configured, click or Render . A new viewport window will appear showing your design in a 3D perspective. Rotate: Left-click and drag your mouse to spin the model. The KLayout roadmap includes discussions about true 3D
# Example KLayout Ruby script to export a 25D view as PNG view = RBA::Application::instance.main_window.current_view view.set_config("use-2.5d", "true") # Set layer heights programmatically layer_index = view.layer_index_for(LayoutView::Layer.new(1, 0)) view.set_layer_property(layer_index, "2d-height", 0.5) # Capture image image = RBA::Image::new(view.max_viewport_width, view.max_viewport_height) view.render_image(image) image.save("layout_25d_snapshot.png")
The KLayout 2.5D view transforms flat layout masks into intuitive, tangible structures. By taking the time to map your process heights into KLayout, you create a powerful sandboxed environment to audit complex interconnects, verify MEMS geometries, and confidently inspect silicon photonic designs prior to tape-out.
: Assign highly contrasting colors to your layers in the 2D layout view before exporting to 25D. This makes tracking vertical via connections highly visual. If you want to tailor this visualization to
To generate a meaningful 25D view, KLayout requires explicit instructions on how to handle the vertical (
KLayout’s advantage is – you do not leave the tool. No export, no conversion, no separate window management (beyond one extra view).
The KLayout 25D view transforms flat, abstract polygons into an intuitive physical representation of your chip design. By spending a few minutes setting up your process layer stack, you unlock the ability to catch design flaws early, optimize complex MEMS geometries, and communicate your design intent clearly to fabrication teams.
Manually typing layer thicknesses every time you open KLayout is inefficient. Save your process stack configuration as a .lyt (technology) or .xs (cross-section) file. You can then instantly load this file whenever you work on a project using the same foundry process node. Common Troubleshooting
MEMS devices rely heavily on vertical suspension, air gaps, and cavity etching. Silicon photonics layout requires precise waveguide positioning relative to cladding layers. Visualizing these devices in 2.5D ensures the structural integrity of the physical device matches design intent. 3. Debugging Complex DRC Errors
