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UncleRemus

Problem with mesh data structure

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Hello, First of all a happy new year !! I'm creating a simple mesh class and I stumbled upon the following : Initialization of Mesh :
m_Vertices.push_back(cVector(-1.0f,-1.0f,1.0f));
m_Vertices.push_back(cVector(-1.0f,1.0f,1.0f));
m_Vertices.push_back(cVector(1.0f,1.0f,1.0f));
m_Vertices.push_back(cVector(1.0f,-1.0f,1.0f));
m_Vertices.push_back(cVector(-1.0f,-1.0f,-1.0f));
m_Vertices.push_back(cVector(-1.0f,1.0f,-1.0f));
m_Vertices.push_back(cVector(1.0f,1.0f,-1.0f));
m_Vertices.push_back(cVector(1.0f,-1.0f,-1.0f));

m_Triangles.push_back(cTriangle(0,1,2));
m_Triangles.push_back(cTriangle(2,3,0));
m_Triangles.push_back(cTriangle(4,5,6));
m_Triangles.push_back(cTriangle(6,7,4));

m_Mesh.push_back(0);
m_Mesh.push_back(1);
m_Mesh.push_back(2);

m_Mesh.push_back(2);
m_Mesh.push_back(3);
m_Mesh.push_back(0);

m_Mesh.push_back(4);
m_Mesh.push_back(5);
m_Mesh.push_back(6);

m_Mesh.push_back(6);
m_Mesh.push_back(7);
m_Mesh.push_back(4);

glVertexPointer(3,GL_FLOAT,0,&m_Vertices[0]);


Rendering :
glColor3f(1.0,0.0,0.0);  //Red
glDrawElements(GL_TRIANGLES,m_Triangles.size()*3,GL_UNSIGNED_INT,&m_Triangles[0]);

glColor3f(0.0,1.0,0.0); //Green
glDrawElements(GL_TRIANGLES,m_Mesh.size(), GL_UNSIGNED_INT,&m_Mesh[0]);

Now the red mesh is drawn incorrectly, while the green one is correct. Does anyone have an idea why this is ? kind regards UncleRemus

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The ctriangle looks like this :


class cTriangle
{
public:

unsigned int a,b,c;

cTriangle(unsigned int _a=0.0f,unsigned int _b=0.0f,unsigned int _c=0.0f);
virtual ~cTriangle(void);
};

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strange...
it might have a vtable because of your 'virtual'. if sizeof(cTriangle) is returning 12 it should work. =)

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are you sure both triangles are being drawn counter-clockwise? What is incorrect about the mesh? Is it not visible?

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