Notes:
1) This is the radius of the disks displayed to the vertices of volumes for the command displ vertex vol
2) It is also of the commands sphere vol and deformation vol

Changes this value.

Returns the radius of the 3D polygonal line (x1,y1,z1, x2,y2,z2, ...).

Returns the dimensions of brush id according to its type:
disk: radius x and y of an elliptical brush.
image: dimensions x and y of the image.
smooth: side of the smoothing window.
average: side of the average window.
rectangle: dimensions x and y.

Changes these dimensions.
Note: If the brush id is of type image it is reset if the dimensions change.

Returns the automatically computated radius of particles (or vol vol) of volume id when this volume has been built with generate particle image(id0)vol(id1)vol(id).

assigns this value.
Option:
c,m: r=coefficient, m = maximum (1 by default).
for each point p of volume id, if a = average distance of p with its neighbours, the radius of the particle displayed at this point is c * a.
Example: `radius dist vol(id)=.4,1.25;`

Returns the radius of facet num of the volume id.

Force points facet num of the volume id has to be internal to the sphere center itsof gravity and radius r.

Returns the centet and the radius of curvature of the curve p{0,2} (first 3 points of the 3D curve p). Returns NIL in case of zero curvature.
Options:
number(num): Returns the centet and the radius of curvature of the curve p{num-2,num-1,num} (num=1 by default).

Returns the radius of the vertices s of the variable x.

Forces vertices s of variable x to be on the sphere with center the center of gravity and of radius r.

Returns the radius of vertices s of volume id

Forces vertices s of volume id to be on the sphere with center the center of gravity and of radius r.

Returns the center and radius of curvature of the displacement trajectory of the volume id.
Notes:
1) yes radius must be active.
2) Used by adjust vol law (power law 1/3).

Returns the center and radius of curvature of the curve at point num of the displacement trajectory of the volume id.

Returns the radius of the variable name x.

Forces points of variable x to be on the sphere with center the center of gravity and of radius r.

Returns the average distance from vertex s volume id to its neighbours.

Changes this distance.
Note:
`generate radius near vertex vol(id);`
generates these average distances.