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Will using FeatureLevelSwitch node be fine with ? Ie use 20 shared samplers for SM5 and use 10 for SM4 (so it compiles for GL as well)?
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No, actually level SM4 supports 128 just fine in D3D. It’s an OpenGL limitation specifically. We may make a SamplerLimitSwitch in the future so you can use a ton of samplers but still make the material compile on GL platforms.