public static void Extrude(this pb_Object pb, pb_Face[] faces, float extrudeDistance)
{
if (faces == null || faces.Length < 1)
{
return;
}
pb_IntArray[] sharedIndices = pb.GetSharedIndices();
Vector3[] localVerts = pb.vertices;
Vector3[] oNormals = pb.msh.normals;
pb_Edge[] perimeterEdges = pb.GetPerimeterEdges(faces);
if (perimeterEdges == null || perimeterEdges.Length < 3)
{
Debug.LogWarning("No perimeter edges found. Try deselecting and reselecting this object and trying again.");
return;
}
pb_Face[] edgeFaces = new pb_Face[perimeterEdges.Length]; // can't assume faces and perimiter edges will be 1:1 - so calculate perimeters then extrace face information
int[] allEdgeIndices = new int[perimeterEdges.Length * 2];
int c = 0;
for (int i = 0; i < perimeterEdges.Length; i++)
{
// wtf does this do
edgeFaces[i] = faces[0];
foreach (pb_Face face in faces)
{
if (face.edges.Contains(perimeterEdges[i]))
{
edgeFaces[i] = face;
}
}
allEdgeIndices[c++] = perimeterEdges[i].x;
allEdgeIndices[c++] = perimeterEdges[i].y;
}
List <pb_Edge> extrudedIndices = new List <pb_Edge>();
/// build out new faces around edges
for (int i = 0; i < perimeterEdges.Length; i++)
{
pb_Edge edge = perimeterEdges[i];
pb_Face face = edgeFaces[i];
// Averages the normals using only vertices that are on the edge
Vector3 xnorm = Vector3.zero;
Vector3 ynorm = Vector3.zero;
// don't bother getting vertex normals if not auto-extruding
if (extrudeDistance > Mathf.Epsilon)
{
xnorm = Norm(edge.x, sharedIndices, allEdgeIndices, oNormals);
ynorm = Norm(edge.y, sharedIndices, allEdgeIndices, oNormals);
}
int x_sharedIndex = sharedIndices.IndexOf(edge.x);
int y_sharedIndex = sharedIndices.IndexOf(edge.y);
pb_Face newFace = pb.AppendFace(
new Vector3[4]
{
localVerts [edge.x],
localVerts [edge.y],
localVerts [edge.x] + xnorm.normalized * extrudeDistance,
localVerts [edge.y] + ynorm.normalized * extrudeDistance
},
new pb_Face(
new int[6] {
0, 1, 2, 1, 3, 2
}, // indices
face.material, // material
new pb_UV(face.uv), // UV material
face.smoothingGroup, // smoothing group
-1, // texture group
-1, // uv element group
face.colors[0]), // colors
new int[4] {
x_sharedIndex, y_sharedIndex, -1, -1
});
extrudedIndices.Add(new pb_Edge(x_sharedIndex, newFace.indices[2]));
extrudedIndices.Add(new pb_Edge(y_sharedIndex, newFace.indices[4]));
}
// merge extruded vertex indices with each other
pb_IntArray[] si = pb.sharedIndices; // leave the sharedIndices copy alone since we need the un-altered version later
for (int i = 0; i < extrudedIndices.Count; i++)
{
int val = extrudedIndices[i].x;
for (int n = 0; n < extrudedIndices.Count; n++)
{
if (n == i)
{
continue;
}
if (extrudedIndices[n].x == val)
{
pb_IntArrayUtility.MergeSharedIndices(ref si, extrudedIndices[n].y, extrudedIndices[i].y);
break;
}
}
}
// Move extruded faces to top
localVerts = pb.vertices;
Dictionary <int, int> remappedTexGroups = new Dictionary <int, int>();
foreach (pb_Face f in faces)
{
// Remap texture groups
if (f.textureGroup > 0)
{
if (remappedTexGroups.ContainsKey(f.textureGroup))
{
f.textureGroup = remappedTexGroups[f.textureGroup];
}
else
{
int newTexGroup = pb.UnusedTextureGroup();
remappedTexGroups.Add(f.textureGroup, newTexGroup);
f.textureGroup = newTexGroup;
}
}
int[] distinctIndices = f.distinctIndices;
foreach (int ind in distinctIndices)
{
int oldIndex = si.IndexOf(ind);
for (int i = 0; i < extrudedIndices.Count; i++)
{
if (oldIndex == extrudedIndices[i].x)
{
pb_IntArrayUtility.MergeSharedIndices(ref si, extrudedIndices[i].y, ind);
break;
}
}
}
}
// this is a separate loop cause the one above this must completely merge all sharedindices prior to
// checking the normal averages
foreach (pb_Face f in faces)
{
foreach (int ind in f.distinctIndices)
{
Vector3 norm = Norm(ind, si, allEdgeIndices, oNormals);
localVerts[ind] += norm.normalized * extrudeDistance;
}
}
pb.SetSharedIndices(si);
pb.SetVertices(localVerts);
pb.RebuildFaceCaches();
}
