# How can i create a 3d curve/saddle shape?

I have tried and failed to use the Bezier Curve tool to create a 3D saddle shape only managing to bend a plane in one direction.

Is this the best way to do so and how should I go about doing it?

This is the shape i'm trying to create: Thanks

• can you add a picture of what you want to create? Are you struggling with trying to get the plane to bend "around the horse" and arch front to back? Feb 15, 2017 at 23:04
• I guess a subdivided plane driven by a lattice modifier would do the job perfectly, I'll make you a more detailed answer later. Feb 16, 2017 at 21:35

Bezier curves are not the proper tool for this, curves are useful mainly for extrusion based geometries, or sections-swept-along-paths shapes.

NURBS surfaces may be closer to what you need, though they will require some considerable manual modeling work, and they are a half-baked tool in Blender that wont help much.

You may also model this manually using meshes and subdivisions, but again will require a lot of manual modelling and not necessarily yield a mathematically accurate surface.

The best way to model such thing is using the builtin addon Add Mesh: Extra Objects Python script

Start by opening File > User Preferences > Addons then search for Extra and activate the Add Mesh: Extra Objects addon.

Then in the 3D View press Shift+A > Add > Mesh > Math Function > Z Math Function

According to Wikipedia the mathematical function for a simple Saddle Point surface is Z = X^2 - Y^2 so in the operator properties change the input formula to the desired function using Python notation which should be (x**2 - Y**2) If you're just going for that look, and don't need mathematical precision,
Subdivide a plane then add a Simple Deform modifier using a sphere.

Do this twice. Once along the X-axis, and once along the Y-axis.

Set the Deform Angle positive for one of 'em,
and negative for the other.

You can see the technique illustrated here: