使用 assimp 导出 3D 模型而不重新索引顶点

Question

我正在使用 assimp.net 导出我的 3d 模型。 assimp 将重新索引导出模型中的顶点！我需要以前的索引顺序。有没有办法在导出的模型中保存以前的索引？

正在导出代码：

using (var asmpCntx = new AssimpContext())
    {
        LogStream.IsVerboseLoggingEnabled = true;
        using (var pipe = new LogPipe(_logStore))
        {
           return asmpCntx.ExportFile(_raw, "MyExportedFile.obj", "obj");
        }
    }

预期顺序：

130921 vertex positions

v -0.111804 -0.257020 0.282297

v -0.110387 -0.261969 0.278314

v -0.103693 -0.262174 0.281221

v -0.105030 -0.257238 0.285222

v -0.106187 0.409742 0.238732

v -0.106169 0.403559 0.240970

v -0.100297 0.403623 0.242419

v -0.100294 0.409780 0.240066

v -0.585048 -0.776799 -0.674764

v -0.588571 -0.779106 -0.672874

v -0.584674 -0.779821 -0.668612

v -0.581676 -0.777379 -0.670708

v -0.064894 -0.808259 -0.292862

v -0.065003 -0.813085 -0.296292

v -0.056978 -0.813406 -0.295237

v -0.056888 -0.808645 -0.291699

...

f 1/1/1 2/2/2 3/3/3 4/4/4

f 5/5/5 6/6/6 7/7/7 8/8/8

f 9/9/9 10/10/10 11/11/11 12/12/12

f 13/13/13 14/14/14 15/15/15 16/16/16

f 17/17/17 18/18/18 19/19/19 20/20/20

f 21/21/21 22/22/22 23/23/23 24/24/24

f 25/25/25 26/26/26 27/27/27 28/28/28

f 29/29/29 30/30/30 31/31/31 32/32/32

f 33/33/33 34/34/34 35/35/35 36/36/36

f 37/37/37 38/38/38 39/39/39 40/40/40

f 41/41/41 42/42/42 43/43/43 44/44/44

f 45/45/45 46/46/46 47/47/47 48/48/48

f 49/49/49 50/50/50 51/51/51 52/52/52

f 53/53/53 54/54/54 55/55/55 56/56/56

f 57/57/57 58/58/58 59/59/59 60/60/60

f 61/61/61 62/62/62 63/63/63 64/64/64

...

导出订单：

130921 vertex positions

v -0.111804 -0.25702 0.282297

v -0.110387 -0.261969 0.278314

v -0.103693 -0.262174 0.281221

v -0.10503 -0.257238 0.285222

v -0.10243 -0.267136 0.27725

v -0.095897 -0.267675 0.280051

v -0.097084 -0.262695 0.284046

v -0.098237 -0.25754 0.287812

v -0.112767 -0.251395 0.285155

v -0.1062 -0.251911 0.288609

v -0.09934 -0.252212 0.291206

v -0.113301 -0.245382 0.287103

v -0.106914 -0.245987 0.290933

v -0.119279 -0.251091 0.281232

v -0.119601 -0.244982 0.282834

v -0.113586 -0.239219 0.288503

...

f 1/1/1 2/2/2 3/3/3

f 1/1/1 3/3/3 4/4/4

f 2/2/2 5/5/5 3/3/3

f 3/3/3 5/5/5 6/6/6

f 3/3/3 6/6/6 7/7/7

f 4/4/4 3/3/3 7/7/7

f 4/4/4 7/7/7 8/8/8

f 9/9/9 1/1/1 4/4/4

f 9/9/9 4/4/4 10/10/10

f 10/10/10 4/4/4 8/8/8

f 10/10/10 8/8/8 11/11/11

f 12/12/12 9/9/9 10/10/10

f 12/12/12 10/10/10 13/13/13

f 13/13/13 10/10/10 11/11/11

f 14/14/14 1/1/1 9/9/9

f 15/15/15 14/14/14 9/9/9

...

Answer 1

Asset-Importer-Lib 将对几何进行优化。所以我们不能保证你的顶点顺序不会改变。

使用 assimp 导出 3D 模型而不重新索引顶点

Exporting 3D models with assimp without re-indexing vertices

3d

vertex

assimp