|
| View previous topic :: View next topic |
| Author |
Message |
nextstep
Site Admin
Joined: 06 Jan 2007
Posts: 539
|
 Posted: Wed Jan 10, 2007 6:12 am Post subject: Icosahedron |
 |
|
Hi all,
One beautiful example with it's associated minimal .Obj mesh generated
by K3DSurf:
| Quote: |
F(x, y, z) = if((x^2 + y^2 +z^2 < 35),
2 - (cos(x + (1+sqrt(5))/2*y) + cos(x - (1+sqrt(5))/2*y) + cos(y + (1+sqrt(5))/2*z) + cos(y - (1+sqrt(5))/2*z) + cos(z - (1+sqrt(5))/2*x) + cos(z + (1+sqrt(5))/2*x)) ,
1)
[x]:-5.5, 5.5
[y]:-5.5, 5.5
[z]:-5.5, 5.5 |
( and Yes, formulas with the "if" instruction
should work with all K3DSurf version  )
_________________
Cheers,
Abderrahman |
|
| Back to top |
  |
 |
inode
Joined: 27 Jan 2007
Posts: 127
Location: Austria
|
| Posted: Fri Feb 09, 2007 2:56 pm Post subject: |
|
|
Hi all
This figure can be also defined without a condition  :
| Code: | F(x,y,z) = 2 - (cos(x + (1+sqrt(5))/2*y) + cos(x - (1+sqrt(5))/2*y) + cos(y + (1+sqrt(5))/2*z) + cos(y - (1+sqrt(5))/2*z) + cos(z - (1+sqrt(5))/2*x) + cos(z + (1+sqrt(5))/2*x))*16/(x*x+y*y+z*z)
[x]: -5, 5
[y]: -5, 5
[z]: -5, 5
|
 And if you want a different color for the sphere inside,
activate CND with the formula (x^2+y^2+z^2 > 3)
if you choose (x^2+y^2+z^2 > 2.5)
you'll get patterned sphere.
Last edited by inode on Sun Feb 25, 2007 8:10 am; edited 3 times in total |
|
| Back to top |
|
|
nextstep
Site Admin
Joined: 06 Jan 2007
Posts: 539
|
| Posted: Fri Feb 09, 2007 3:54 pm Post subject: |
|
|
Hi all,
Brillant idea inode  .
_________________
Cheers,
Abderrahman |
|
| Back to top |
|
|
tomot
Joined: 21 Jul 2007
Posts: 23
Location: Vancouver
|
| Posted: Sat Apr 04, 2009 12:58 am Post subject: |
|
|
FYI: To make the Icosahedron you have to use the following code, if you are using the latest version of K3dSurf:
| Code: | F():if((x^2 + y^2 +z^2 < 35),
2 - (cos(x + (1+sqrt(5))/2*y) + cos(x - (1+sqrt(5))/2*y) + cos(y + (1+sqrt(5))/2*z) + cos(y - (1+sqrt(5))/2*z) + cos(z - (1+sqrt(5))/2*x) + cos(z + (1+sqrt(5))/2*x)) ,
(x^2 + y^2 +z^2 -35))
[x]:-5.5, 5.5
[y]:-5.5, 5.5
[z]:-5.5, 5.5 |
|
|
| Back to top |
|
|
tomot
Joined: 21 Jul 2007
Posts: 23
Location: Vancouver
|
| Posted: Sat Apr 11, 2009 5:18 pm Post subject: |
|
|
| OOPS! I did not notice it was an example in the main loaded file, sorry! |
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
2005 Powered by phpBB © 2001, 2005 phpBB Group
|
