increase and decrease a value in a pattern?

[Skiddy]

ive created a datum curve of which i want to pattern around the edge of the solid protrusion.
Easy enough, direction 1: angle enter increment value

the only problem i want the datum curve to increae and decrease in length as it rotates around the solid protrusion...
i can get it to increase by using the second direction of the pattern..
select the length and enter the increment value but how could i make it decrease in length while rotating round? Do i need to add a constraint eg a maxium or a relation?

Im a little stuck... is it possible?

Many thanks

 

[mjcole]

You want to use the relation pattern or pattern table option.

When you create a pattern you can select Value where you enter a constant increment. Relation where you can enter relations with idx1 as a integer that goes from 0 and increases by one for each successive instance. Relations can be by value or increment.

For first direction pick the angle as you've tried before then pick relation and the length as the second dimension in first direction.

After you pick Relation and the dim hit edit and type the following relation where n is the number of curves in pattern and t is the number of times you want the sin function to happen along the way

memb_v=#d+sin(idx1*t*360/n)

Michael


I can send you a demo trailfile if you want.

 

[Skiddy]

yeah... could you send me the trail file please!

ickle_mini_me@hotmail.com

Many thanks for your reply!