Klayout 2.5d View Jun 2026

In the world of semiconductor design and MEMS (Micro-Electro-Mechanical Systems), has established itself as the gold standard for open-source mask layout viewing and editing. It is fast, scriptable, and handles massive GDS/OASIS files with ease.

KLayout does not magically guess the thickness of your oxide or the height of your copper. The power lies in its system. To utilize the 2.5D view effectively, the user must map the logical layers of the GDS file to physical heights.

In modern CMOS processes, designs can have 10, 12, or even more metal layers. In a standard 2D view, these layers are superimposed, creating a confusing mess of overlapping colors. The 2.5D view allows the engineer to separate these layers spatially, instantly revealing if a Metal 1 trace is crossing a Poly trace correctly, or if a via stack is misaligned. It turns a "Where is this net going?" question into an immediately visible path. klayout 2.5d view

You are rendering millions of tiny polygons. Go to Edit > Selection > Select All , then Edit > Other > Merge Shapes . Merging adjacent polygons reduces vertex count significantly.

You need or later. Older versions had a rudimentary 3D preview, but the modern view_3d feature is stable and fast. In the world of semiconductor design and MEMS

Don't render the whole chip. Use the clipping plane tool (scissors icon in 3D view) to slice through a small area of interest.

Navigate to the top menu: (or press the keyboard shortcut Ctrl+Shift+3 on Windows/Linux). The power lies in its system

This is where 90% of users get stuck. KLayout does not automatically know how tall your layers are. You must assign "Z" values.

For a tool that prides itself on speed and scriptability, KLayout’s implementation of 2.5D viewing is a game-changer for several reasons: