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tex/FileHDR

Loads a Radiance .hdr image as a high dynamic range texture.

Files

Decodes a Radiance (.hdr) file, the format most HDRI libraries publish, into a float texture suitable for image-based lighting. The usual use is an equirectangular environment map: drop this inside a geo/Environment and the whole scene is lit by it, or point a material's envMap at it directly.

Radiance stores each pixel as RGB plus a shared exponent, so values well above 1 survive — that is what makes the bright parts of a sky read as a light source rather than as white. Mips are prefiltered with the GGX filter by default, which is what the roughness response of a material samples; switch to Box for a plain texture that happens to be HDR.

For OpenEXR files use tex/FileEXR instead. Ordinary 8-bit images (JPG, PNG) go through tex/Image.

Parameters

Name Type What it does
path AssetPath Path or URL of the Radiance .hdr file to load.
mipmapsFilter UInt8 Box · EnvironmentGGX How the mip chain is built. EnvironmentGGX prefilters each level for a roughness value, which is what environment lighting samples; Box is a plain 2x2 average, for an HDR image used as an ordinary texture.
reload Button Decode the file again, picking up a change made on disk since the last cook.

See also

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