## sort line

### sort line(x1,y1,z1,x2,y2,z2,...)

Returns the "best" 3D polygonal line constructed on the points **(xi, yi, zi)**
(in the sense that consecutive points are as close as possible).
### sort(p1) poi(g) axis(d) normal(n)

Returns the 3D polygonal line **p1** sorted starting at its intersection with the axis (g, d)
and rotating in the positive direction around **n**.

**Notes:**

1) g = center of gravity of **p1** by default.

2) `sort(p1) CG axis(d) normal(n);`

g = center of gravity of **p1**.
de p1
## sort vol

### sort vol(id)

Returns the **sort** parameter of volume **id**.
### sort vol(id)=t

Changes this parameter.

**Notes:**

1) Si **t=0**: in a affcihage with transparency (see 'illum') facets will not be sorted:
calculations are thus accelerated, but the order of the facets must be opposite to that of their distances from the eye.

2) 1 is default, facets will be sorted.