I've had some time to look around in the VBscript references and I have found
some more math functions that a very useful in 3D.

                               abs(x)
                               y^x
                               x mod y
                               int(x)

The first one is the power function, in combination with a sin or cos, can 
produce varying result.

As you can see this function is very useful to create random fcurves. The next 
one is the Int( ) function, this one is very useful in modeling.
































TASK: Try to model a DNA structure, with the knowledge of math101 and math102
           you should have no problem. A DNA structure is made up of to helix, not to
           be confuse with a spiral. To help you out this is the math function for a 
           helix: 
                            x = r cos t
                            y = r sin t
                            z = ct

                         where r is the radius of the helix and c is a constant
                         giving the vertical separation of the helix's loops. t is 
                         the tangent

            You should get something that looks like this image, actually this
             is a triple helix model that I did for my project: "Code Name: THX"
             The DNA structure is a double helix and in my next tutorial I will
              explain how to do the middle part of the structure 

dim i
dim x
dim y
dim z
dim num_cv
dim increment

i=0
x=0
y=0
z=0
num_cv=100
increment= 0.2

SICreateCurve "crvlist", 3, 0

do while i <= num_cv

	i=i+1
	x=increment+x
	y=abs(sin(1.5^x)*5)
	SIAddPointOnCurveAtEnd "crvlist", x, y, z, False
	
loop










dim i
dim x
dim y
dim z
dim num_cv
dim increment

i=0
x=0
y=0
z=0
num_cv=100
increment= 0.1

SICreateCurve "crvlist", 3, 0

do while i <= num_cv

	i=i+1
	x=increment+x
	y=int(x mod 2)
	SIAddPointOnCurveAtEnd "crvlist", x, y, z, False
	
loop