Delete ShadingModelStandard, it never really worked but if you were using it for some reason use ShadingModelValveStandard instead as that'll stay backwards compatible. This probably shouldn't be a break, it's gonna stop remapping normal/rma on old glass materials otherwise Don't define standard material inputs if S_MULTIBLEND is set, this is the best way I can think of to reduce samplers on blendable without breaking backwards compatability. I don't see much reason for this stuff to even be in common, it's pretty hyper specific to the blendable shader. Also will get rid of the bullshit first input from an artist workflow: https://files.facepunch.com/yourname/1b2111b1/sbox-dev_kGyz4UAlhq.png