Geometry Decimate

Geometry Decimate is the downsampler — Subdivide's opposite. Vertices snap to a grid of Cell Size, every occupied cell becomes one vertex, and collapsed triangles vanish. Bigger cells, fewer triangles, honestly.

It was built for collision proxies: cable the same geometry through a Decimate into a Particle Collider and particles bounce off a mesh a tenth the cost, refitting its acceleration structure in a fraction of the time — while the render keeps full detail.

Smooth recomputes normals; off keeps the crunchy low-poly look, which is a style of its own.

• Cheap collision — Full detail to the Mesh, a decimated twin to the Collider.
• Animated colliders — An animated mesh re-fits its acceleration structure every frame; a decimated one does it far faster.
• Low-poly styling — Smooth off and a detailed model becomes a faceted sculpture.
• Lighten an import — Model files are often far denser than a real-time scene needs.
• Proxy for sampling — Point scattering over a simplified surface.

• Cell Size is in Grafit units. Start around a twentieth of the object's size and adjust by watching the triangle count.
• The grid-snapping approach is fast and predictable, but it does not preserve silhouettes as carefully as a quadric decimator would — check the outline.
• Particle Collider's own Collision Quality (Full / Half / Quarter) does the same thing internally; this node is the explicit version.
• Smooth off is often the better look on an already-decimated mesh — half-smooth reads as a mistake.