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Made this thing ages ago and never got around to uploading. I wanted to recreate the last bit of effects work I did for Path of Exile in ue4, and I figured out a way to do it without relying on Houdini to generate a pivot map. The idea was to use substance painter's basic position map baker, but with each individual piece shrunken down to negligible size so the resulting position map basically ended up being a pivot map for the un-shrunken geo.

Pretty proud of it, did a breakdown of the hacks involved here https://twitter.com/crossflip/status/1518278370424938502
Geo for the portal frame comes from JRO kitbash sample pack

The version of it I did for PoE was one of my first attempts at the technique. I made it on my last day at the company. My colleague Javier polished the final version that was eventually released in game, which ended up looking a lot better.

An early WIP of the PoE MTX

An early WIP of the PoE MTX

Shrinking every piece to near zero puts all vertices close to the pivot of that piece. Baking out the resulting position map in painter gives you a pivot map

Shrinking every piece to near zero puts all vertices close to the pivot of that piece. Baking out the resulting position map in painter gives you a pivot map