Klayout 25d View Jun 2026

Chemical Mechanical Polishing (CMP) requires uniformity. In a 2D layout, it’s hard to gauge density variation. The 25D view, when colored by layer height, gives a pseudo-topographic map. Rapidly alternating tall and short metal regions (poor density) looks like a mountain range, prompting dummy fill insertion.

KLayout’s 25D feature requires a few setup steps. It is not enabled by default in minimal installations due to hardware acceleration dependencies. klayout 25d view

For decades, integrated circuit (IC) layout engineers have relied on two-dimensional, top-down views to design chips. But as process nodes shrink and designs grow in complexity, a purely planar perspective often obscures critical relationships between layers. This is where comes into play. Chemical Mechanical Polishing (CMP) requires uniformity

True 3D visualization of a full chip is computationally expensive and often unnecessary for design rule checking or parasitic extraction. A 2.5D view, by contrast, creates the illusion of depth while keeping the underlying geometry strictly planar. In KLayout, this is achieved by extruding each layout layer vertically by a user-defined height factor and applying an oblique camera angle (typically isometric or dimetric). Layers retain their original planar coordinates, but are rendered as flat plates separated in the Z-axis. Color-coded layers, semi-transparency, and adjustable vertical scaling allow the designer to see through higher metal layers down to the substrate. The result is not a physically accurate 3D model—hence "2.5D"—but a cognitively intuitive representation of which layers sit above or below others. Rapidly alternating tall and short metal regions (poor