This is to do list for TargetManager 7.3.2.


Bow (like that thing found in plane)
x = (2 + T*sin(u))*sin(2v)
y = (2 + T*sin(u))*cos(2v)
z = T*cos(u) + L*cos(v)
u \in [0, TwoPi[
v \in [0, FourPi]
T thickness
L uphill

Snowflake

Highly parametric surface
x = r*sin(v)*cos(u)
y = r*sin(v)*sin(u)
z = r*cos(v) + cu + d*log(tan(ev)), tan(ev) > 0
d=r, e=0.5 c=0 d \ne 0 -> pseudosphere
c \ne 0 - combination of sphere and pseudosphere

Implicit surfaces
for the given field D(r), ex. D(r) = 1/r^2
the surface is the equipotential surface
1) D(r) = a*exp(-b*r^2)
2) D(r) = a*(1-3^r^2/b^2), 0<r<=b/3,
          1.5*a*(1-r/b)^2, b/3<r<=b, 
          0, r>=b 

3D surface by parametric formula
Povray output in DDscat format
Conical Spring?
