37 posts
• Page **4** of **4** • 1, 2, 3, **4**

How do you set an instance variable to <varies>. I sorta get how it comes to that, but what circumstances result in <varies> being displayed in the properties bar? Like, if I edited the initial value, how do I get it back to <varies>?

I'm seeking Narnia. Who wants to come with me! Aslan is on the move!

**Posts:**759**Reputation:**14,327

B

127
S

21
G

8
set x to (2*t^3-3*t^2+1)*p(n).x + (t^3-2*t^2+t)*(p(n+1).x-p(n-1).x)/2 + (-2*t^3+3*t^2)*p(n+1).x + (t^3-t^2)*(p(n+2).x-p(n).x)/2

set Y to (2*t^3-3*t^2+1)*p(n).y + (t^3-2*t^2+t)*(p(n+1).y-p(n-1).y)/2 + (-2*t^3+3*t^2)*p(n+1).y + (t^3-t^2)*(p(n+2).y-p(n).y)/2

it must be written by Albert Einstein !

set Y to (2*t^3-3*t^2+1)*p(n).y + (t^3-2*t^2+t)*(p(n+1).y-p(n-1).y)/2 + (-2*t^3+3*t^2)*p(n+1).y + (t^3-t^2)*(p(n+2).y-p(n).y)/2

it must be written by Albert Einstein !

**Posts:**192**Reputation:**1,514

B

15
S

5
R0J0hound wrote:Here is a way to do a spline though waypoints:

http://dl.dropbox.com/u/5426011/example ... llrom.capx

A plugin could be made to hide the formula, but there isn't a way to make an in IDE node editor at this time.

Is it okay if I ask how you came up with the original spline? Is there a concept you followed to help you come up with the math inside of the 'Set position' action? I ask because I would really like direction in improving my own programming skills - of which I have none.

Edit: Lol, I didn't realize the actual name of the capx was the hint I needed.

Edit2: For anyone, like me, that couldn't get the array version working properly, you need to replace p.Count with Array.Width and (n-1) % Array.Width with n > 0 ? (n-1) % Array.Width : Array.Width-1, since when n = 0, you get -1, and I don't know how using -1 as an index affects arrays.

**Posts:**23**Reputation:**1,273

B

20
S

5
**Posts:**5,068**Reputation:**57,870

B

85
S

27
G

85
Egyptoon wrote:set x to (2*t^3-3*t^2+1)*p(n).x + (t^3-2*t^2+t)*(p(n+1).x-p(n-1).x)/2 + (-2*t^3+3*t^2)*p(n+1).x + (t^3-t^2)*(p(n+2).x-p(n).x)/2

set Y to (2*t^3-3*t^2+1)*p(n).y + (t^3-2*t^2+t)*(p(n+1).y-p(n-1).y)/2 + (-2*t^3+3*t^2)*p(n+1).y + (t^3-t^2)*(p(n+2).y-p(n).y)/2

it must be written by Albert Einstein !

I was trying to understand and know where this came from and then I find it.

in this PDF there is a small explanation on how to get those positions from X and Y: http://algorithmist.net/docs/catmullrom.pdf

(it is formula number [7] in the PDF)

now I have to understand everything.

**Posts:**207**Reputation:**39,513

B

54
S

30
G

69
37 posts
• Page **4** of **4** • 1, 2, 3, **4**

## Who is online |

Users browsing this forum: artbava, Google [Bot] and 11 guests |