Functions 3D: Examples
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Torus
(0.4^2-(0.6-(x^2+y^2)^0.5)^2)^0.5
Ripple
sin(10(x^2+y^2))/10
Tube
1/(15(x^2+y^2))
Bumps
sin(5x)*cos(5y)/5
Cone
(x^2+y^2)^0.5
Functions by Corrado, friend of Gianni
Stairs
(sign(-.65-x)+sign(-.35-x)+sign(-.05-x)+sign(.25-x)+sign(.55-x))/7
Pyramid
1-abs(x+y)-abs(y-x)
Paper Plane
sign(x) * atan(x*80)/6 * sign(-y-x+1) * sign(-y+x+1)*5 - 1.01
Green Cross
.1 - sign(sign((x*12)^2-9)-1 + sign((y*12)^2-9)-1)/2
Mosque Dome
.7/log(x^2+y^2)+.6
Roof
1-abs(y)
Windmill
sign(x*y) * sign(1-(x*9)^2+(y*9)^2)/9
Floppy Disc
(1-acsc((x*4)^2+(y*4)^2))/1000
Triangle
(1-sign(-x-.51+abs(y*2)))/3 * (sign(.5-x)+1)/3
Top Hat
(sign(0.2-(x^2+y^2)) + sign(0.2-(x^2/3+y^2/3)))/3-1
Letter A
((1-sign(-x-.9+abs(y*2)))/3*(sign(.9-x)+1)/3)*(sign(x+.65)+1)/2 - ((1-sign(-x-.39+abs(y*2)))/3*(sign(.9-x)+1)/3) + ((1-sign(-x-.39+abs(y*2)))/3*(sign(.6-x)+1)/3)*(sign(x-.35)+1)/2
Letter O
(-sign(0.2-(x^2+y^2)) + sign(0.2-(x^2/3+y^2/3)))/9
Letter V
sign(x-1+abs(y*2))/3 + sign(x-.5+abs(y*2))/3
Intersecting Fences
.75/exp((x*5)^2*(y*5)^2)