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What is a Geometry Kernel? C3D vs ACIS vs Parasolid

nickkallen1 · explainer · Watch on YouTube

Computer graphics & rendering3D printing, CNC & maker projects

What it is

The Plasticity creator explains what a geometry kernel is and compares commercial options C3D, ACIS, and Parasolid, describing his months of research and why he chose as he did.

Why Hacker News recommends it

Cited in CAD threads as a rare plain-spoken comparison of commercial geometry kernels and their limitations.

  • 3 people recommended it
  • 2 different months
  • 0 strong recommendations
  • first 2023, last 2025

What HN commenters said

  1. “Originally it was based on C3D, but he switched halfway through to Parasolid.[0]”

    Plasticity author explains switching from C3D to Parasolid kernel.

    s1mon, 2023-02 · Recommendation · in “CAD Sketcher, free and open-source project bringing CAD like tools to Blender3d”

  2. “Mentions an interesting video[2] going through the commercial geometry kernel options and their resp. limitations”

    Compares commercial geometry kernels and their limitations.

    virtualritz, 2023-02 · Recommendation · in “Show HN: Replicad, the Library for CAD in the Browser”

  3. “I think his video comparing geometry kernels [0] was posted to HN a while back, but it's worth a watch if you're curious!”

    Plasticity creator compares geometry kernels.

    awhitty, 2024-03 · Recommendation · in “Plasticity: CAD for Artists”

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: parasolid, c3d, acis, plasticity, cad

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