can wgslFn sample a LUT well enough?
three's wgslFn binds a texture handle but provides no sampler, so a WGSL integrator must do manual bilinear via textureLoad. This compares that against TSL's hardware-filtered texture(), sampling the real Transmittance LUT over a UV sweep. If maxDiff is small, the full integrator port is viable; if not, integrator LUTs stay on TSL for the three path.
running…