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Y-up: ~30% of industry STEP files; detect on import, never trust

John Lauer ·e3b0c3a016 ·3mo ago ·parent 55c6b10
1 file changed +1
README.md+1
README.md+1
@@ -135,5 +135,6 @@ Every wiki page is built from these pillars (each is a tab on the page and a ver | Term | Definition | |------|-----------| | **Z-up** | Adom 3D convention: Z is up, ground plane XY at z=0. Babylon scenes use `zUp: true`. |+| **Y-up** | The OTHER up. ~30% of the industry ships chip STEP files Y-up (the rest Z-up) — it's weird out there. Detect and recover the true up-axis on import (chipsmith does this) rather than trusting the file; a Y-up part rendered as Z-up lies on its side. | | **KiCad Y flip** | KiCad Y points down; negate Y converting to Adom 3D. | | **GLB 1000x scale** | glTF is meters, Adom is mm — GLB models scale 1000x; overlay positions multiply by 1000. |