Today I thought of a way to manually make a sphere. Once again there is a .gif. Then there are 2 bonus pics
the gif: in the pic with the red right triangle: When you x-axis rotate the green circle in the .gif, the outer radius becomes the apothem of the gray circle. (The gray circle is the waistline outline for the final sphere.) So this means getting C accurate is important if you want a perfect sphere. You can probably get C more accurate with math than by rotating the apothem of the triangle onto the vertical grid line and measuring it (which is what I did ).
xtra pic 1: These are 2 unintended things that I got. The gray waistline is where the green brushes overflowed a bit past the desired sphere radius (128units) when I CSG subtracted them asin the .gif. This happened b/c I got the "outer radius" parameter for curve 3 (the green circle) from the .gif a bit off. I am not sure if the invisible texture peeking happened b/c of this parameter. Maybe you could try to fix both unintended things? (Btw b/c of the invisible texture shimmering, the sphere could not be CSG merged into one brush! )
xtra pic 2: To get the left thn I CSG hollowed the sphere with grid 8. Then I clipper split and inverted top portion. To get the right thn I CSG subtracted with a shrunk duplicate sphere. Then I clipper split and inverted top portion.
I hope this gif gives you ideas for new maps etc
EDIT: 4got: In the gif the two CSG subtract pics have a *. *: You might have to press CSG subtract more than once, say twice, to remove any xtra fragments.
It the it's level set: http://neverforum.com/fmpbo/viewtopic.php?id=29226/19/17: a bit of help needed here, plz: http://neverforum.com/fmpbo/viewtopic.php?id=2988
avatar drawn with ANVIL-1000MD (c) and scaled down with GIMPにほんご を べんきょう する。
(i am studying japanese)