访问模型索引

starhuhu 2016-07-13 12:50:13

上代码：
osg::ref_ptr<osg::Node> mModel = osgDB::readNodeFile(“Tile_+037_+004_+000.osgb”);

osg::PagedLOD* pagedLOD = dynamic_cast<osg::PagedLOD*>((osg::Node*)mModel);

osg::ref_ptr<osg::Geode> geode = dynamic_cast<osg::Geode*>(pagedLOD->getChild(0));

deprecated_osg::Geometry *geom = (deprecated_osg::Geometry *)(geode->getDrawable(0));

osg::UIntArray* coordIndices = (osg::UIntArray*)(geom->getVertexIndices());

问题： coordIndices 一直为 NULL ，为什么？怎么样才能访问到模型顶点的索引数据呢？

我知道范围顶点是很容易，用

osg::Vec3 v(0,0,0);
osg::Vec3Array *vx = dynamic_cast<osg::Vec3Array*>(geom->getVertexArray());
osg::Vec3Array::iterator coord_index = vx->begin();

while( coord_index != vx->end() )
{
v = *(coord_index++) ;
// v._v[0] ;v._v[1] ;v._v[2] ; // 顶点坐标
}

模型数据如下：
PagedLOD {
UniqueID PagedLOD_0
nodeMask 0xffffffff
cullingActive TRUE
Center -2328.59 -2698.65 8.49903
Radius 93.1091
RangeMode PIXEL_SIZE_ON_SCREEN
RangeList 2 {
0 93.1091
93.1091 1e+030
}
DatabasePath D:\00_OSG\Data2015\4/
NumChildrenThatCannotBeExpired 0
DisableExternalChildrenPaging 0
FileNameList 2 {
""
Tile_+037_+004_+000_L16_0.osgb
}
num_children 1
Geode {
nodeMask 0xffffffff
cullingActive TRUE
num_drawables 2
Geometry {
DataVariance STATIC
StateSet {
DataVariance STATIC
rendering_hint DEFAULT_BIN
renderBinMode INHERIT
Material {
ColorMode OFF
ambientColor 1 1 1 1
diffuseColor 1 1 1 1
specularColor 0 0 0 1
emissionColor 0 0 0 1
shininess 0
}
textureUnit 0 {
GL_TEXTURE_2D ON
Texture2D {
DataVariance STATIC
file "Tile_+037_+004_+000_0.jpg"
wrap_s CLAMP
wrap_t CLAMP
wrap_r CLAMP
min_filter LINEAR_MIPMAP_LINEAR
mag_filter LINEAR
maxAnisotropy 1
borderColor 0 0 0 0
borderWidth 0
useHardwareMipMapGeneration TRUE
unRefImageDataAfterApply TRUE
internalFormatMode USE_IMAGE_DATA_FORMAT
resizeNonPowerOfTwo TRUE
shadowComparison FALSE
shadowCompareFunc GL_LEQUAL
shadowTextureMode GL_LUMINANCE
}
}
}
useDisplayList TRUE
useVertexBufferObjects FALSE
PrimitiveSets 1
{
DrawElementsUInt TRIANGLES 243
{
0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19
20 11 21 22 23 24 25 26 27 28
29 30 22 3 29 14 1 0 31 32
33 34 17 35 36 37 38 4 39 40
41 34 42 21 37 14 38 29 22 21
34 33 43 44 45 46 29 21 42 1
47 22 30 6 22 48 44 26 40 39
49 50 22 6 51 26 46 50 1 22
12 52 13 26 40 48 53 20 54 17
16 55 49 18 20 26 44 46 31 48
56 32 49 53 49 10 57 54 20 58
59 60 43 40 49 57 51 27 26 47
1 31 48 31 61 53 33 32 20 19
58 29 3 5 28 40 26 9 48 57
40 57 48 6 1 50 48 9 56 28
41 40 25 62 23 49 39 18 45 44
63 32 34 10 60 34 43 21 11 34
30 29 5 9 47 56 63 44 48 53
54 33 34 60 42 34 11 10 59 12
60 3 37 4 49 20 53 47 9 22
6 30 7 1 6 2 42 60 14 10
49 32 22 9 11 47 31 56 48 61
63 6 8 2 12 14 60 42 14 29
57 10 9
}
}
VertexArray Vec3Array 64
{
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-2282.17 -2666.2 4.83722
-2274.95 -2696.02 5.14414
-2268.6 -2650.08 7.61186
}
TexCoordArray 0 Vec2Array 64
{
0.384372 0.94007
0.467246 0.879598
0.526579 0.980059
0.617202 0.550379
0.646899 0.528323
0.650184 0.57028
0.600365 0.8558
0.626845 0.823966
0.655968 0.927195
0.264052 0.763828
0.222727 0.587508
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0.590057 0.371382
0.640609 0.344651
0.603435 0.444502
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0.120184 0.769774
0.0536213 0.727151
0.0485689 0.654374
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0.640703 0.756302
0.290692 0.893816
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0.0422966 0.574882
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0.13168 0.853804
0.0794467 0.915159
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0.121495 0.571798
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0.0269959 0.756477
0.657695 0.302121
0.118076 0.411803
0.0827794 0.279358
0.795296 0.771746
0.285948 0.824352
0.218155 0.632442
0.00845727 0.27482
0.486479 0.349703
0.468566 0.406314
0.218879 0.888557
0.901154 0.45191
0.144375 0.944569
}
}
Geometry {
DataVariance STATIC
StateSet {
DataVariance STATIC
rendering_hint DEFAULT_BIN
renderBinMode INHERIT
Material {
ColorMode OFF
ambientColor 0.501961 0.501961 0.501961 1
diffuseColor 0.501961 0.501961 0.501961 1
specularColor 0 0 0 1
emissionColor 0 0 0 1
shininess 0
}
}
useDisplayList TRUE
useVertexBufferObjects FALSE
PrimitiveSets 1
{
DrawElementsUInt TRIANGLES 12
{
0 1 2 3 4 5 1 6 2 3
7 4
}
}
VertexArray Vec3Array 8
{
-2268.6 -2650.08 7.61186
-2282.17 -2666.2 4.83722
-2271.17 -2659.22 -0.517275
-2373 -2756 9.66438
-2388.85 -2768.16 18.5201
-2375.93 -2768.96 16.5073
-2286.83 -2666.25 -1.50324
-2380.19 -2736.26 7.47725
}
}
}
}

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