How to draw and extrude this curved figure?

Question

I'm a new Blender's user and I cannot figuring out how to do that...

Does someone can explain me how to create/draw this figure and extrude it to get a smoothed edges 3D mesh? I'd like to create a marble pedestal.

Is there any tool similar to the Adobe Illustrator Pencil tool?

Answer 1

A way to do that:

Start with a plane (ShiftA then 'mesh' and 'plane'), enter edit mode (Tab), select all vertices A and delete X 'faces only'.

Still in edit mode, select the vertices, and hit W subdivide. Then in the operator panel, choose 2 cuts.

Now add a subsurface modifier. Set it to two subdivisions, for instance, and check 'adjust cage to modifier result' :

Select the four corners, then scale S :

(edit) For the extrusion :

Select all, extrude Z EZ, the add a loop cut CtrlR and adjust it to the top.

Select the top vertices again, then scale them down a bit.

(edit, again) If you need to close the shape :

Simply add the needed quads, and eventually add another loop cut to make the vert/horz transition more sharp:

Answer 2

Final result:

Creation:

1. Create a Plane, go to Edit Mode, press W then Subdivide.
2. Select vertices as shown below and delete them.

3. Add Mirror Modifier and check X, Y and Clipping.
4. Add Subdivision Surface Modifier and set both View and Render to 2 (or higher if you need more details).
5. Select all (A) and subdivide it twice, as in first step - or once if you want really smooth edges.
6. Enable Proportional Editing and select vertices as shown below.

7. Press S to scale and adjust Proportional Editing with mouse scroll then try to match shape.

8. Now you can select all end Extrude it along Z axis.

Final thoughts:

If you want harder edges you will want to add loop cuts (CTRL+R) as shown below:

Don't forget to set shading to Smooth.

Answer 3

Steps

• Create a new document.
• Delete the Cube mesh.
• Align to Top ortho view (NUM7).
• Switch to Edit mode.
• Create a new Plane mesh.
• Delete Only faces (X).
• Subdivide it with a factor of 2 (W).
• Select all of the vertices (A).
• Add the modifier called Subdivision Surface to the figure.
• Check Adjust edit cage to modifier result.
• Choose 4 view units.
• Deselect all of the vertices (A).
• Select the four vertices located at each corner of the figure (ALTRight-click).
• Press S and scale them.
• Select all the vertices (A).
• Press R then CTRL to rotate the new figure to 45 deg.

• Switch to Object mode and apply the modifier.
• Switch to Edit mode again.
• Select the top vertices (ALTRight-click).
• Add Make Edge/Face to create the top face of the volum.
• Add the modifier called Bevel.
• Adjust the Width and Segments value.
• Switch to Object mode and apply the modifier.

Fig. https://image.ibb.co/fW6wLa/GIF2.gif

Final result