glColor3f(1, 1, 1);

// Output the LEFT VERTEX for the triangle

glVertex3f((GLfloat) leftX,(GLfloat) leftZ,(GLfloat) leftY );

glColor3f(1, 1, 1);

// Output the RIGHT VERTEX for the triangle

glVertex3f((GLfloat) rightX, (GLfloat) rightZ, (GLfloat) rightY );

glColor3f(1, 1, 1);

// Output the APEX VERTEX for the triangle

glVertex3f((GLfloat) apexX,(GLfloat) apexZ,(GLfloat) apexY );
 

   
CUSTOMVERTEX cvVertices[3];

cvVertices[0].colour = D3DCOLOR_XRGB(255, 255, 255);
cvVertices[0].x = leftX;
cvVertices[0].y = leftZ;
cvVertices[0].z = leftY;

cvVertices[1].colour = D3DCOLOR_XRGB(255, 255, 255);
cvVertices[1].x = rightX;
cvVertices[1].y = rightZ;
cvVertices[1].z = rightY;

cvVertices[2].colour = D3DCOLOR_XRGB(255, 255, 255);
cvVertices[2].x = apexX;
cvVertices[2].y = apexZ;
cvVertices[2].z = apexY;

VOID* pVertices;


//Get a pointer to the vertex buffer vertices and lock the vertex buffer

m_pVertexBuffer->Lock(0, sizeof(cvVertices), (VOID**)&pVertices, 0);
    
//Copy our stored vertices values into the vertex buffer

memcpy(pVertices, cvVertices, sizeof(cvVertices));

//Unlock the vertex buffer

m_pVertexBuffer->Unlock();

HRESULT hr = m_pD3DDevice->SetStreamSource(0, m_pVertexBuffer, 0, sizeof(CUSTOMVERTEX));
hr = m_pD3DDevice->SetFVF(D3DFVF_CUSTOMVERTEX);
hr = m_pD3DDevice->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 1);