logarithmic spiral? Not sure how this happened, but I'm fascinated by the results

Replies to This Discussion

Permalink Reply by djordje on December 16, 2012 at 4:43am

Hi Alex,

I am not a grasshopper expert, but that final shape does look very interesting.

You seemed made a definition with two point attractors(repellers). A distance from the reppeller points is used to define number of sides of the polygon - the closer the polygon is to the repeller points the fewer number of sides it has.

Later on, you used those same distances as from repeller points as radian angles for rotation. This resulted in very interesting shape.

There are two things you can play with further - editing the rotation point, and altering the angles values by multiplying it with some number - the larger the number, the larger the rotation angle, the more curved cycles the spiral has.

Try using that number slider and MD slider I grouped in purple block to alter the final shape.

Good work!

Attachments:

• what.gh, 7 KB

Permalink Reply by Alex on December 16, 2012 at 12:40pm

Woah thanks djordje! Im just trying to understand why the Rotation is rotating/morphing the whole rectangular grid instead of just rotating the individual polygons in place. And the Graph element you dropped on the canvas is quite interesting.

Regards, 

Alex K

Permalink Reply by djordje on December 16, 2012 at 12:47pm

The whole rectangular grid is rotated because you have a single rotation point for all those polygons. Therefor all of them are rotated around that point.

If you would like all of them to rotate around it's centroid's, you need to apply each of those centroids as a rotation point, like in the file attached.

Again you alter the rotation angle value by using the Number slider grouped in purple.

Attachments:

• what.gh, 7 KB

Permalink Reply by Alex on December 16, 2012 at 12:59pm

OK! So somehow I must have designated a point or plane of rotation in the rotation component without actually referencing a point in my rhino file. Thank you for your interest and help. 

Permalink Reply by djordje on December 16, 2012 at 1:10pm

You didn't. It's already build in by default, when you post a component onto your Grasshopper canvas - it's always 0,0,0 point and XY rotation plane by default, unless you change it.