FBX 文件中使用的压缩算法是什么？

Question

我写了imorter fbx-files，指导规范位于这个link https://code.blender.org/2013/08/fbx-binary-file-format-specification/。它表示可以压缩数据集（例如，顶点数组）。行。从 Blender 导出时，我得到了压缩的顶点集，但我无法解压缩它们，因为它们不适合任何一个库（DotNetZip、SharpZipLib）。怎么了？

示例：

注意：Vertex是double类型

你

ncompressed vertices in ascii fbx file: 

-12.500000,-12.500000,0.000000,12.500000,-12.500000,0.000000,-12.500000,12.500000,0.000000,12.500000,12.500000,0.000000,-12.500000,-12.500000,25.000000,12.500000,-12.500000,25.000000,-12.500000,12.500000,25.000000,12.500000,12.500000,25.000000

压缩二进制数据：

    [0] 120 byte
    [1] 1   byte
    [2] 99  byte
    [3] 96  byte
    [4] 0   byte
    [5] 1   byte
    [6] 205 byte
    [7] 3   byte
    [8] 96  byte
    [9] 10  byte
    [10]    78  byte
    [11]    67  byte
    [12]    120 byte
    [13]    64  byte
    [14]    113 byte
    [15]    7   byte
    [16]    28  byte
    [17]    226 byte
    [18]    7   byte
    [19]    160 byte
    [20]    226 byte
    [21]    80  byte
    [22]    121 byte
    [23]    8   byte
    [24]    15  byte
    [25]    73  byte
    [26]    61  byte
    [27]    186 byte
    [28]    248 byte
    [29]    1   byte
    [30]    136 byte
    [31]    10  byte
    [32]    152 byte
    [33]    61  byte
    [34]    150 byte
    [35]    80  byte
    [36]    121 byte
    [37]    116 byte
    [38]    243 byte
    [39]    225 byte
    [40]    226 byte
    [41]    48  byte
    [42]    245 byte
    [43]    80  byte
    [44]    117 byte
    [45]    112 byte
    [46]    113 byte
    [47]    52  byte
    [48]    125 byte
    [49]    150 byte
    [50]    14  byte
    [51]    0   byte
    [52]    146 byte
    [53]    244 byte
    [54]    12  byte
    [55]    117 byte

Answer 1

那个数据是zlib stream and can be decompressed with zlib。此处以十六进制显示解压结果：

00 00 00 00 00 00 29 c0 00 00 00 00 00 00 29 c0
00 00 00 00 00 00 00 00 00 00 00 00 00 00 29 40
00 00 00 00 00 00 29 c0 00 00 00 00 00 00 00 00
00 00 00 00 00 00 29 c0 00 00 00 00 00 00 29 40
00 00 00 00 00 00 00 00 00 00 00 00 00 00 29 40
00 00 00 00 00 00 29 40 00 00 00 00 00 00 00 00
00 00 00 00 00 00 29 c0 00 00 00 00 00 00 29 c0
00 00 00 00 00 00 39 40 00 00 00 00 00 00 29 40
00 00 00 00 00 00 29 c0 00 00 00 00 00 00 39 40
00 00 00 00 00 00 29 c0 00 00 00 00 00 00 29 40
00 00 00 00 00 00 39 40 00 00 00 00 00 00 29 40
00 00 00 00 00 00 29 40 00 00 00 00 00 00 39 40

FBX 文件中使用的压缩算法是什么？

What is the compression algorithm used in FBX file?

import

zip

compression

blender

fbx