I wanted to create a triangle mesh representing the ribs but with a very low number of triangles. The Remesh tool has difficulty making the surface **very** coarse: typically volume loss occurs and triangles start self-intersecting. So instead I opted to draw a single triangle and extrude it along the center lines of the ribs.

To draw the triangle I used the "Sketch -> Lines" tool and drew three lines in a closed loop. Then I used the "Wire Tools -> Cover Loops" to cover the loop and create a sheet. Finally, I converted it to a triangle mesh ("Mesh Tools -> To Mesh").

Then using a simple python script I extruded the triangle along each center line:

```
import XCoreMath
import XCoreModeling
Vec3 = XCoreMath.Vec3
sel = XCoreModeling.GetActiveModel().SelectedEntities
sel = XCoreModeling.CollectEntities(sel)
trimesh = [e for e in sel if isinstance(e, XCoreModeling.TriangleMesh)][0]
wires = [e for e in sel if isinstance(e, XCoreModeling.Body)]
prisms = []
for w in wires:
len = XCoreModeling.MeasureLength([w])
num_layers = int(len / 10.0)
wire = XCoreModeling.GetWires(w)[0]
c = wire.GetGeometry(True)
trimesh.Transform = XCoreModeling.Transform()
T = XCoreMath.Translation(c.Eval(0.0))
R = XCoreMath.Rotation(Vec3(0.0, 0.0, 1.0), c.EvalTangent(0.0))
trimesh.ApplyTransform(T * R)
meshes = XCoreModeling.ExtrudeMesh([trimesh], w, npoints=num_layers)
for p in meshes:
s = XCoreModeling.ExtractUnstructuredMeshSurface(p)
prisms.append(s)
p.Delete()
```