很简单的一段程序，断言错误

wwwanghao

1. int main()
   
2. {
   
3.         osg::Group* root = new osg::Group();
   
4.         //osg::Geode* pyramidGeode = new osg::Geode;//createGeode();
   
5.         //osg::Geometry* pyramidGeometry = createGeometry();
   
6.         //pyramidGeode->addDrawable(pyramidGeometry);
   
7.         osg::Geode* pyramidGeode = createGeode();
   
8.         root->addChild(pyramidGeode);
   
9.        
   
10. 
    
11.         VertexVisitor vs;
    
12.         //root->accept(vs);
    
13. 
    
14.         osgViewer::Viewer view;
    
15.         view.setSceneData(root);
    
16.         view.setUpViewInWindow(100,100,800,600);
    
17.         view.run();
    
18.         return 0;
    
19. 
    
20. }

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1. osg::Geode * createGeode()
   
2. {
   
3.         osg::ref_ptr<osg::Geometry> geo = new osg::Geometry;
   
4.         osg::Vec3Array* vecarray = new osg::Vec3Array;     //顶点坐标数组
   
5.         osg::UByteArray* vecindex = new osg::UByteArray;   //顶点索引数组
   
6.         vecarray->push_back(osg::Vec3(1.0, 0.0, 1.0));
   
7.         vecarray->push_back(osg::Vec3(-1.0, 0.0, 1.0));
   
8.         vecarray->push_back(osg::Vec3(-1.0, 0.0, -1.0));
   
9.         vecarray->push_back(osg::Vec3(1.0, 0.0, -1.0));
   
10. 
    
11.         vecindex->push_back(3);
    
12.         vecindex->push_back(2);
    
13.         vecindex->push_back(1);
    
14.         vecindex->push_back(0);
    
15. 
    
16.         geo->setVertexArray(vecarray);
    
17.         geo->setVertexIndices(vecindex);
    
18. 
    
19.         //osg::DrawElements *ele=new osg::DrawElements();
    
20.         geo->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,vecindex->size()));
    
21. 
    
22.         osg::Vec4Array* colors = new osg::Vec4Array;
    
23.         colors->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f) );
    
24.         colors->push_back(osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f) );
    
25.         colors->push_back(osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f) );
    
26.         colors->push_back(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f) );
    
27.        
    
28.         osg::UIntArray * colorIndexArray = new osg::UIntArray();
    
29.         geo->setColorArray(colors);
    
30.         geo->setColorIndices(colorIndexArray);
    
31.         geo->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
    
32. 
    
33.         osg::Geode * geode=new osg::Geode;
    
34.         geode->addDrawable(geo);
    
35.         return geode;
    
36. }

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Debug Assertion Failed
expression: vector subscript out of range.
百思不得其解，不知道那个地方ｏｕｔ　ｏｆ　ｒａｎｇｅ，求指点一下吧，调试的时候，只有到　view.run()的时候才出断言错误，所以不知道是什么原因。

allan

那是因为颜色索引数组你没有定义，就是这个变量colorIndexArray。第28行代码你直接new了后没赋值。像vecindex那样赋值就可以了

wwwanghao

不好意思，是我粘贴错了函数，是调用下面这个函数的时候出现 断言错误

1. osg::Geometry * createGeometry()
   
2. {
   
3.         osg::Geometry * pyramidGeometry = new osg::Geometry;
   
4.         osg::Vec3Array* pyramidVertices = new osg::Vec3Array;
   
5.         pyramidVertices->push_back( osg::Vec3( 0, 0, 0) ); // 左前
   
6.         pyramidVertices->push_back( osg::Vec3(10, 0, 0) ); // 右前
   
7.         pyramidVertices->push_back( osg::Vec3(10,10, 0) ); // 右后
   
8.         pyramidVertices->push_back( osg::Vec3( 0,10, 0) ); // 左后
   
9.         pyramidVertices->push_back( osg::Vec3( 5, 5,10) ); // 塔尖
   
10.         pyramidGeometry->setVertexArray( pyramidVertices );
    
11. 
    
12.         /*
    
13.         osg::DrawElementsUInt* pyramidBase = new osg::DrawElementsUInt(osg::PrimitiveSet::QUADS, 0);
    
14.         pyramidBase->push_back(3);
    
15.         pyramidBase->push_back(2);
    
16.         pyramidBase->push_back(1);
    
17.         pyramidBase->push_back(0);
    
18.         pyramidGeometry->addPrimitiveSet(pyramidBase);
    
19. 
    
20.         osg::DrawElementsUInt* pyramidFaceOne = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);
    
21.         pyramidFaceOne->push_back(0);
    
22.         pyramidFaceOne->push_back(1);
    
23.         pyramidFaceOne->push_back(4);
    
24.         pyramidGeometry->addPrimitiveSet(pyramidFaceOne);
    
25.         osg::DrawElementsUInt* pyramidFaceTwo = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);
    
26. 
    
27.         pyramidFaceTwo->push_back(1);
    
28.         pyramidFaceTwo->push_back(2);
    
29.         pyramidFaceTwo->push_back(4);
    
30.         pyramidGeometry->addPrimitiveSet(pyramidFaceTwo);
    
31.         osg::DrawElementsUInt* pyramidFaceThree = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);
    
32.         pyramidFaceThree->push_back(2);
    
33.         pyramidFaceThree->push_back(3);
    
34.         pyramidFaceThree->push_back(4);
    
35.         pyramidGeometry->addPrimitiveSet(pyramidFaceThree);
    
36.         osg::DrawElementsUInt* pyramidFaceFour = new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLES, 0);
    
37.         pyramidFaceFour->push_back(3);
    
38.         pyramidFaceFour->push_back(0);
    
39.         pyramidFaceFour->push_back(4);
    
40.         pyramidGeometry->addPrimitiveSet(pyramidFaceFour);
    
41.         */
    
42.         osg::UIntArray* vecindex = new osg::UIntArray;   //顶点索引数组
    
43.         vecindex->push_back(0);vecindex->push_back(1);vecindex->push_back(4);
    
44.         vecindex->push_back(1);vecindex->push_back(2);vecindex->push_back(4);
    
45.         vecindex->push_back(2);vecindex->push_back(3);vecindex->push_back(4);
    
46.         vecindex->push_back(3);vecindex->push_back(0);vecindex->push_back(4);
    
47. 
    
48.         pyramidGeometry->setVertexIndices(vecindex);
    
49.         pyramidGeometry->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLES,0,vecindex->size()));
    
50. 
    
51.         osg::Vec4Array* colors = new osg::Vec4Array;
    
52.         colors->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f) );
    
53.         colors->push_back(osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f) );
    
54.         colors->push_back(osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f) );
    
55.         colors->push_back(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f) );
    
56.         //osg::TemplateIndexArray <unsigned int, osg::Array::UIntArrayType,4,4> *colorIndexArray;
    
57.         //colorIndexArray = new osg::TemplateIndexArray<unsigned int, osg::Array::UIntArrayType,4,4>;
    
58.         osg::UIntArray * colorIndexArray = new osg::UIntArray();
    
59.         colorIndexArray->push_back(0); // vertex 0 assigned color
    
60.         colorIndexArray->push_back(1); // vertex 1 assigned color
    
61.         colorIndexArray->push_back(2); // vertex 2 assigned color
    
62.         colorIndexArray->push_back(3); // vertex 3 assigned color
    
63.         colorIndexArray->push_back(0); // vertex 4 assigned color
    
64.         pyramidGeometry->setColorArray(colors);
    
65.         pyramidGeometry->setColorIndices(colorIndexArray);
    
66.         pyramidGeometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
    
67. 
    
68.         osg::Vec2Array* texcoords = new osg::Vec2Array();
    
69.         texcoords->push_back(Vec2(0.00f,0.0f));
    
70.         texcoords->push_back(Vec2(0.25f,0.0f));
    
71.         texcoords->push_back(Vec2(0.5f,0.0f));
    
72.         texcoords->push_back(Vec2(0.75f,0.0f));
    
73.         texcoords->push_back(Vec2(0.5f,1.0f));
    
74.         pyramidGeometry->setTexCoordArray(0,texcoords);
    
75. 
    
76.         return  pyramidGeometry;
    
77. }

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