public bool Backward()
{
if (this.index == 0)
{
return(false);
}
else
{
index--;
EdgeContext ctx = this.method.Logs[this.index];
SplitVertex.Split(this.Mesh, ctx);
TriMesh.Vertex left = null;
TriMesh.Vertex right = null;
foreach (var v in this.Mesh.Vertices)
{
if (v.Index == ctx.Left)
{
left = v;
}
else if (v.Index == ctx.Right)
{
right = v;
}
}
TriMesh.HalfEdge hf = left.FindHalfedgeTo(right);
hf.Face.Traits.Normal = TriMeshUtil.ComputeNormalFace(hf.Face);
hf.Opposite.Face.Traits.Normal = TriMeshUtil.ComputeNormalFace(hf.Opposite.Face);
left.Traits.Normal = TriMeshUtil.ComputeNormalAreaWeight(left);
right.Traits.Normal = TriMeshUtil.ComputeNormalAreaWeight(right);
return(true);
}
}