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OpenEXR is an HDR standard developed by Industrial Light & Magic. OpenEXR file extension is .exr, the common OpenEXR file is FP16 (16bit Float Point, also known as half Float Point) data image file, the data type of each channel is FP16, a total of four channels 64bpp, each channel 1 bit bit is used to mark the "index", 5 bits are used to store the value of the index, 10 bits are used to store the mantissa of the chromaticity coordinates (u, v), and its dynamic range is from 6.14 × 10 ^ -5 to 6.41 × 10 ^ 4.
Draco is a glTF extension for mesh compression, an open source library developed by Google for compressing and decompressing 3D meshes to significantly reduce the size of 3D content. It compresses vertex positions, normals, colors, texture coordinates, and any other general vertex properties, increasing the efficiency and speed of transferring 3D content on the web.