Anyone know why this code is giving an illegal opperation? It compiles but when i try to the program it crashes. //Loop through each point of a triangle for (int k = 0; k < 3; k++) { //Start at the top of the vertex list VertexList * pVertCurrent = pCollisionGroupsCurrent->pVertFirst; int l = 0; while(1) { if (pVertCurrent->m_location == m_pVertices[m_pTriangles[pTriangleIndices[j]].m_vertexIndices[k]].m_location) { break; } //End of the lsit if (pVertCurrent == NULL) { pVertCurrent = new(VertexList); pVertCurrent->m_location[0] = m_pVertices[m_pTriangles[pTriangleIndices[j]].m_vertexIndices[k]].m_location[0]; pVertCurrent->m_location[1] = m_pVertices[m_pTriangles[pTriangleIndices[j]].m_vertexIndices[k]].m_location[1]; pVertCurrent->m_location[2] = m_pVertices[m_pTriangles[pTriangleIndices[j]].m_vertexIndices[k]].m_location[2]; break; } ********** //compiler says there is someting wrong here //something about an access violation pVertCurrent = pVertCurrent->pNext; l++; } Sorry bout the mess. Help much appreciated.

quote:

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if (pVertCurrent->m_location == m_pVertices[m_pTriangles[pTriangleIndices[j]].m_vertexIndices[k]].m_location)
{
break;
}

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You are using the pointer before checking to see if it is NULL.
Hope this helps

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#define TRUE 0
#define FALSE 1
//MUAHAHAHAHAAAA!

yep, that was it. Thanks.