# \#3-d

**URL:** https://community.geodynamics.org/tag/3-d/166.md

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## [A fault crossing two materials in 3-D](https://community.geodynamics.org/t/a-fault-crossing-two-materials-in-3-d/4442)

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**Author:** [@yifany](https://community.geodynamics.org/u/yifany)\
**Replies:** 2\
**Last updated:** [January 26, 2026, 8:08am UTC](https://community.geodynamics.org/t/a-fault-crossing-two-materials-in-3-d/4442 "2026-01-26T08:08:00Z")

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Dear PyLith developing team, Thanks for your continuous effort. I am building a toy model of a fault embedded in a box cutting two layers of materials. The setup looks like this: I took care to mark the fault edges…