I recently made my octtree set a diffuse color equal to the depth of the node a triangle was in, and I think (ok, it was pretty obvious) that something was wrong. So once again, I hope some kind soul will be willing to look at these three functions and tell me where I went wrong, since this is the second rewrite and I'm clueless.
Function 1: The triangle struct holds three points, p0, p1, and p2. I know this function doesn't take into consideration that the triangle could be larger than the whole node but my results don't show that to be the problem and at this stage I'm not worrying about it.
bool cOctTreeNode::CheckTriangle(TRIANGLE* tri)
{
if(((m_Min.x <= tri->p0.x && tri->p0.x <= m_Max.x) && (m_Min.y <= tri->p0.y && tri->p0.y <= m_Max.y) && (m_Min.z <= tri->p0.z && tri->p0.z <= m_Max.z)) ||
((m_Min.x <= tri->p1.x && tri->p1.x <= m_Max.x) && (m_Min.y <= tri->p1.y && tri->p1.y <= m_Max.y) && (m_Min.z <= tri->p1.z && tri->p1.z <= m_Max.z)) ||
((m_Min.x <= tri->p2.x && tri->p2.x <= m_Max.x) && (m_Min.y <= tri->p2.y && tri->p2.y <= m_Max.y) && (m_Min.z <= tri->p2.z && tri->p2.z <= m_Max.z)))
return true;
else
return false;
}
Function 2:
void cOctTreeNode::AddTriangle(TRIANGLE* tri)
{
if(!m_bIsLeaf) //m_bIsLeaf is true if this is a leaf node, false otherwise
{
for(int i=0; i < 8; i++)
{
if(m_pChildren != NULL && m_pChildren->CheckTriangle(tri))
{
m_pChildren->AddTriangle(tri);
return;
}
}
}
else
{
m_pMaterialGroups[tri->material].AddTriangle(tri);
if(GetTotalTris() > MAXTRIANGLESPERNODE)
SplitNode();
}
}
Function 3:
void cOctTreeNode::SplitNode()
{
if(!m_bIsLeaf)
return;
float Mx = m_Max.x;
float My = m_Max.y;
float Mz = m_Max.z;
float mx = m_Min.x;
float my = m_Min.y;
float mz = m_Min.z;
float hx = (m_Max.x + m_Min.x)/2.0f;
float hy = (m_Max.y + m_Min.y)/2.0f;
float hz = (m_Max.z + m_Min.z)/2.0f;
m_pChildren[0] = new cOctTreeNode;
m_pChildren[0]->m_Min = Vector3(mx, hy, hz);
m_pChildren[0]->m_Max = Vector3(hx, My, Mz);
m_pChildren[0]->m_bIsLeaf = true;
m_pChildren[0]->m_pParent = m_pParent;
m_pChildren[1] = new cOctTreeNode;
m_pChildren[1]->m_Min = Vector3(hx, hy, hz);
m_pChildren[1]->m_Max = Vector3(Mx, My, Mz);
m_pChildren[1]->m_bIsLeaf = true;
m_pChildren[1]->m_pParent = m_pParent;
m_pChildren[2] = new cOctTreeNode;
m_pChildren[2]->m_Min = Vector3(mx, hy, mz);
m_pChildren[2]->m_Max = Vector3(hx, My, hz);
m_pChildren[2]->m_bIsLeaf = true;
m_pChildren[2]->m_pParent = m_pParent;
m_pChildren[3] = new cOctTreeNode;
m_pChildren[3]->m_Min = Vector3(hx, hy, mz);
m_pChildren[3]->m_Max = Vector3(Mx, My, hz);
m_pChildren[3]->m_bIsLeaf = true;
m_pChildren[3]->m_pParent = m_pParent;
m_pChildren[4] = new cOctTreeNode;
m_pChildren[4]->m_Min = Vector3(mx, my, hz);
m_pChildren[4]->m_Max = Vector3(hx, hy, Mz);
m_pChildren[4]->m_bIsLeaf = true;
m_pChildren[4]->m_pParent = m_pParent;
m_pChildren[5] = new cOctTreeNode;
m_pChildren[5]->m_Min = Vector3(hx, my, hz);
m_pChildren[5]->m_Max = Vector3(Mx, hy, Mz);
m_pChildren[5]->m_bIsLeaf = true;
m_pChildren[5]->m_pParent = m_pParent;
m_pChildren[6] = new cOctTreeNode;
m_pChildren[6]->m_Min = Vector3(mx, my, mz);
m_pChildren[6]->m_Max = Vector3(hx, hy, hz);
m_pChildren[6]->m_bIsLeaf = true;
m_pChildren[6]->m_pParent = m_pParent;
m_pChildren[7] = new cOctTreeNode;
m_pChildren[7]->m_Min = Vector3(hx, my, mz);
m_pChildren[7]->m_Max = Vector3(Mx, hy, hz);
m_pChildren[7]->m_bIsLeaf = true;
m_pChildren[7]->m_pParent = m_pParent;
m_pChildren[0]->m_Depth = m_pChildren[1]->m_Depth = m_pChildren[2]->m_Depth = m_pChildren[3]->m_Depth = m_pChildren[4]->m_Depth = m_pChildren[5]->m_Depth = m_pChildren[6]->m_Depth = m_pChildren[7]->m_Depth = m_Depth + 1;
for(DWORD i=0; i < 8; i++)
{
if(!m_pParent->CountTriangles(m_pChildren->m_Min, m_pChildren->m_Max))
{
delete m_pChildren;
m_pChildren = NULL;
}
}
m_bIsLeaf = false;
for(DWORD i=0; i < 8; i++)
{
cOctTreeNode* curr = m_pChildren;
if(curr == NULL)
continue;
curr->m_NumMaterialGroups = m_NumMaterialGroups;
curr->m_pMaterialGroups = new cMaterialGroup[m_NumMaterialGroups];
for(DWORD j=0; j < m_NumMaterialGroups; j++)
{
curr->m_pMaterialGroups[j].Init(m_pMaterialGroups[j].GetDevice(), j, m_pMaterialGroups[j].m_pTextureFileName, m_pMaterialGroups[j].GetMaterial());
curr->m_pMaterialGroups[j].m_pParent = curr;
for(DWORD k = 0; k < m_pMaterialGroups[j].m_Triangles.size(); k++)
{
if(curr->CheckTriangle(m_pMaterialGroups[j].m_Triangles[k]))
curr->AddTriangle(m_pMaterialGroups[j].m_Triangles[k]);
}
}
}
for(DWORD i=0; i < m_NumMaterialGroups; i++)
m_pMaterialGroups.Shutdown();
delete[] m_pMaterialGroups;
m_pMaterialGroups = NULL;
m_NumMaterialGroups = 0;
}
Thanks so much everyone who so much as reads this. I'd appreciate any advice!
Thanks
ms
