krisCrash

Stair rendering does have some problems. I get this as well: Left: Forge 1.9-12.16.0.1863, Right: Vanilla 1.9 These are custom stair models so they are revealing the problem a bit differently. In 1.8.9 stairs would cull adjacent blocks to some sides. In 1.9 stairs do not cause any render culling (maybe of slabs, slabs have their own thing here), they are treated like a true transparent block. But, with Forge, stairs are culling adjacent blocks. I checked the 1.8.9 stairs blockstates and they aren't really different from 1.9 (like fences are because of multiparts). JimiIT92, if you'd like me to go over your blockstates or model code I can do that for ya. If in doubt, I generally recommend pasting in the original vanilla code first, especially for blockstates. I wasn't sure if I should make my own thread, if there's a set of stair problems