I learnt one useful command: SetPt>Set z & align to world. This will make all the control point on the same surface.
Here is my 3d file.
I have three questions:
1.How to close an open curve? When I was doing loft function to create the neck of the swan, rhino told me either to use all closed curve or all open curve.
2.How to make a solid surface after cutting? The plane for holding the soap is not a solid object after I cut it.
3. Why my cursor couldn’t move freely as before? Today it only moved straight up and down.