What is a Geometry Kernel? C3D vs ACIS vs Parasolid

Why HN readers recommended it

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

This is a summary from the source dataset, not an endorsement by Hacker News or the video creator.

Video & recommendation details

Creator / channel

nickkallen1

Topic

cad geometry kernels

Format

explainer

Level

intermediate

HN recommenders in dataset

3

HN mentions in dataset

4

Recommendation years in dataset

2023–2025

These counts and years describe the included Hacker News records; they are not YouTube views or the video’s publication date.

From the original HN conversations

Excerpts from the recorded comments. Follow each source for the full comment and surrounding discussion.

• Nick Kallen has been working on an BREP based CAD tool with the sort of ease of modeling that things like Blender has. Originally it was based on C3D, but he switched halfway through to Parasolid.[0] It’s amazing the amount of features he has built …

• See also this thread[1] from yesterday which has some interesting comments on the limitations projects based on the OpenCascade kernel face. Mentions an interesting video[2] going through the commercial geometry kernel options and their resp. limitations from the author of [3]. [1] [LINK] [2] [VIDEO] …

• The creator of this app, Nick Kallen, has a nice YouTube channel where he talks about some of the behind-the-scenes work on the project. I think his video comparing geometry kernels [0] was posted to HN a while back, but it's worth a watch if …