Question

why in a sphere x = xyplaneradius * cos (theta) Z=xyplaneradius*sin(theta)

Answer 1

is theta the azimuthal angle?
and what is "xyplaneradius" ?

Answer 2

yes theta is azimuthal angle XYplane radius is the radius of XYplane

Answer 3

http://tutorial.math.lamar.edu/Classes/CalcII/SphericalCoords.aspx

Answer 4

or someone can explain to me how to get this

XYRadius = sqrt(radius2 – Z2)
XYThetaValue = rand() between PI*2 and zero
X = current position + [cos(XYThetaValue)*XYRadius]
Z = current position + [sin(XYThetaValue)*XYRadius]
Y = current position + [rand() between (-radius) and (radius)]

0 seconds ago

Answer 5

what coordinate system is this?

Answer 6

your notation is confusing me

Answer 7

i also find somewhere distributing/generating points in a Zx plane of a sphere

Answer 8

what is this about y =current position + [rand() between (-radius) and (radius)] ??
what is rand() ??

Answer 9

random is the randome function that can generate random number between -r and r r=radius of sphere