Everything looks like flat colored paper. Solution: You forgot to set the "Height" in Layer Properties, or you haven't tilted the camera (still in top-down orthographic mode).
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 lifeβliterally lifting your polygons off the screen to reveal the true vertical complexity of your design.
But what exactly is "2.5D"? It isn't true 3D rendering (like youβd see in Cadence Virtuoso 3D or Siemens Calibre 3DSTACK). Instead, the 2.5D view in KLayout gives you a pseudo-3D perspective where 2D polygons are extruded vertically based on layer information. This article dives deep into how to activate, configure, and leverage the KLayout 2.5D view to debug your designs faster than ever before. Before clicking buttons, letβs 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. klayout 25d view
Enter βthe open-source, high-performance layout viewer and editor. While KLayout is famous for its speed handling massive GDS/OASIS files, its hidden superpower for many users is the 2.5D View .
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 layer_info.fill_3d = true layer_info.height_3d = height lv.set_layer(layer_index, layer_info) end Everything looks like flat colored paper
layout_view.update_3d_view
(often called the "3D preview" or "perspective view" in older versions) works by taking the flat polygons on your mask layers and assigning them a height (Z-value) and a color . When you tilt the camera, you see "walls" rising from the substrate. Whether you are verifying a MEMS device, a
Objects flicker or have gaps between them. Solution: This is "Z-fighting" (two layers at exactly the same height). Set a micro offset (e.g., Metal1 height 30, Via height 30.001). Alternatively, lower your screen's anti-aliasing settings. Conclusion: The Perspective You Didn't Know You Needed 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.