rememberHDREnvironment

Builds an Environment from an equirectangular HDR image instead of pre-baked KTX — no cmgen step, just ship the .hdr. The reflection cubemap and skybox are prefiltered on the GPU at load via IBLPrefilterContext/EquirectangularToCubemap/SpecularFilter.

The sibling of rememberKTXEnvironment (which loads pre-baked KTX) — same returned type, same scene wiring:

val engine = rememberFilamentEngine()
val env = rememberHDREnvironment(engine) { Res.readBytes("env/lobby.hdr") }
val scene = rememberFilamentScene(
    engine = engine,
    skyboxState = env.skyboxState,
    indirectLightState = env.indirectLightState,
) { GltfInstance(asset = duck) }

Tradeoff vs. rememberKTXEnvironment: there's no baked diffuse irradiance (cmgen's spherical harmonics). Filament approximates diffuse from the reflection's lowest mip — visibly lower quality. Prefer KTX when you can bake offline; use this for raw .hdr workflows. The prefilter runs on the GPU at load, so the first frames render before it lands.

Parameters