public static CellInfo[,,] GenVertices(int resolution, UtilFuncs.Sampler samp)
{
CellInfo[,,] cellInfos = new CellInfo[resolution, resolution, resolution];
for (int x = 0; x < resolution; x++)
{
for (int y = 0; y < resolution; y++)
{
for (int z = 0; z < resolution; z++)
{
//Vector3 p = new Vector3(x, y, z);
byte caseCode = 0;
sbyte[] densities = new sbyte[8];
for (int i = 0; i < 8; i++)
{
Vector3 pos = new Vector3(x, y, z) + DCC.vfoffsets[i];
densities[i] = (sbyte)Mathf.Clamp((samp(pos.x, pos.y, pos.z) * 127f), -127f, 127f); //data[index + inArray[i]];
if (densities[i] < 0)
{
caseCode |= (byte)(1 << i);
}
}
Vector3[] cpositions = new Vector3[4];
Vector3[] cnormals = new Vector3[4];
int edgeCount = 0;
for (int i = 0; i < 12 && edgeCount < 4; i++)
{
byte c1 = (byte)DCC.edgevmap[i][0];
byte c2 = (byte)DCC.edgevmap[i][1];
Vector3 p1 = new Vector3(x, y, z) + DCC.vfoffsets[c1];
Vector3 p2 = new Vector3(x, y, z) + DCC.vfoffsets[c2];
bool m1 = ((caseCode >> c1) & 1) == 1;
bool m2 = ((caseCode >> c2) & 1) == 1;
if (m1 != m2)
{
cpositions[edgeCount] = ApproximateZeroCrossingPosition(p1, p2, samp);
cnormals[edgeCount] = CalculateSurfaceNormal(cpositions[edgeCount], samp);
edgeCount++;
}
}
if (edgeCount == 0)
{
continue;
}
CellInfo cellInfo = new CellInfo();
QEF.QEFSolver qef = new QEF.QEFSolver();
for (int i = 0; i < edgeCount; i++)
{
qef.Add(cpositions[i], cnormals[i]);
}
cellInfo.Position = qef.Solve(0.0001f, 4, 0.0001f);
//drawInfo.index = vertices.Count;
Vector3 max = new Vector3(x, y, z) + Vector3.one;
if (cellInfo.Position.x < x || cellInfo.Position.x > max.x ||
cellInfo.Position.y < y || cellInfo.Position.y > max.y ||
cellInfo.Position.z < z || cellInfo.Position.z > max.z)
{
cellInfo.Position = qef.MassPoint;
}
//vertices.Add(drawInfo.position);
for (int i = 0; i < edgeCount; i++)
{
cellInfo.Normal += cnormals[i];
}
cellInfo.Normal = Vector3.Normalize(cellInfo.Normal); //CalculateSurfaceNormal(drawInfo.position, samp);
//normals.Add(drawInfo.averageNormal);
cellInfo.Corners = caseCode;
cellInfos[x, y, z] = cellInfo;
}
}
}
return(cellInfos);
}
public static OctreeNode SimplifyOctree(OctreeNode node, float threshold)
{
if (node == null)
{
return(null);
}
if (node.type != DCC.OctreeNodeType.Node_Internal)
{
return(node);
}
QEF.QEFSolver qef = new QEF.QEFSolver();
int[] signs = { -1, -1, -1, -1, -1, -1, -1, -1 };
int midsign = -1;
int edgeCount = 0;
bool isCollapsible = true;
for (int i = 0; i < 8; i++)
{
node.children[i] = SimplifyOctree(node.children[i], threshold);
if (node.children[i] != null)
{
OctreeNode child = node.children[i];
if (child.type == DCC.OctreeNodeType.Node_Internal)
{
isCollapsible = false;
}
else
{
qef.Add(ref child.drawInfo.qef.data);
if (qef.data.numPoints == 0)
{
Debug.Log("warning: zero points in qef");
Debug.Log("child number of points: " + child.drawInfo.qef.data.numPoints);
}
//Debug.LogError("Qef points: " + qef.data.numPoints);
midsign = (child.drawInfo.corners >> (7 - i)) & 1;
signs[i] = (child.drawInfo.corners >> i) & 1;
edgeCount++;
}
}
else
{
//Debug.LogError("Null child! type: " + node.type);
}
}
if (!isCollapsible)
{
// at least one child is an internal node, can't collapse
return(node);
}
float QEF_ERROR = 0.1f;
int QEF_SWEEPS = 4;
float PINV_TOL = 0.1f;
if (qef.data.numPoints == 0)
{
for (int i = 0; i < 8; i++)
{
//DestroyOctree(node->children[i]);
node.children[i] = null;
}
node.type = DCC.OctreeNodeType.Node_Psuedo;
OctreeDrawInfo drawInfo2 = new OctreeDrawInfo();
for (int i = 0; i < 8; i++)
{
if (signs[i] == -1)
{
// Undetermined, use centre sign instead
drawInfo2.corners |= (midsign << i);
}
else
{
drawInfo2.corners |= (signs[i] << i);
}
}
drawInfo2.averageNormal = Vector3.zero;
node.drawInfo = drawInfo2;
return(node);
}
Vector3 position = qef.Solve(QEF_ERROR, QEF_SWEEPS, PINV_TOL);
//if(qef.data.num)
float error = qef.GetError();
// at this point the masspoint will actually be a sum, so divide to make it the average
if (error > threshold)
{
// this collapse breaches the threshold
return(node);
}
if (position.x < node.min.x || position.x > (node.min.x + node.size) ||
position.y < node.min.y || position.y > (node.min.y + node.size) ||
position.z < node.min.z || position.z > (node.min.z + node.size))
{
Vector3 mp = qef.MassPoint;
position = new Vector3(mp.x, mp.y, mp.z);
}
// change the node from an internal node to a 'psuedo leaf' node
OctreeDrawInfo drawInfo = new OctreeDrawInfo();
for (int i = 0; i < 8; i++)
{
if (signs[i] == -1)
{
// Undetermined, use centre sign instead
drawInfo.corners |= (midsign << i);
}
else
{
drawInfo.corners |= (signs[i] << i);
}
}
drawInfo.averageNormal = Vector3.zero;
for (int i = 0; i < 8; i++)
{
if (node.children[i] != null)
{
OctreeNode child = node.children[i];
if (child.type == DCC.OctreeNodeType.Node_Psuedo ||
child.type == DCC.OctreeNodeType.Node_Leaf)
{
drawInfo.averageNormal += child.drawInfo.averageNormal;
}
}
}
drawInfo.averageNormal = Vector3.Normalize(drawInfo.averageNormal);
drawInfo.position = position;
QEF.QEFSolver qef2 = new QEF.QEFSolver();
qef2.data = qef.data;
drawInfo.qef = qef2;
for (int i = 0; i < 8; i++)
{
//DestroyOctree(node->children[i]);
node.children[i] = null;
}
node.type = DCC.OctreeNodeType.Node_Psuedo;
node.drawInfo = drawInfo;
return(node);
}
