Dual axis rotation

Replies to This Discussion

Permalink Reply by pratik on January 21, 2012 at 2:51pm

Hi all,

 

I think I have made some progress but have not yet resolved it completely. I now have the individual panels with their central pivot located. Still unable to work out how I could rotate those panels about their pivot and responding to the sun's movement. I have been looking at the discussions but haven't got very far. We had done a similar definition as a group earlier, here the panels were rotating about an axis and resopnding to the sun's movement. I am attaching both the group study definition and my present definition for your reference. Can someone please help asap (would be even more helpful if you could add to definition as oppose to explaing the process). Thanks so much in advance!

 

Attachments:

• Dual axis rotation 1.gh, 13 KB
• Group study responsive panels.gh, 15 KB

Permalink Reply by Roig on January 23, 2012 at 11:33am

so here you have:

its easier to work with reference planes so yo can orient any geometry from a ref plane you choose (in this case the plane within the norma vector and the sun-center point vector) and the planes which you rotate the angle you compute...

Hope this is what you've been looking for.

but sorry, I made it on your study group def. not in yours¡¡¡¡

Attachments:

• Dualaxisrotation1roig.gh, 11 KB

Permalink Reply by pratik on January 23, 2012 at 3:10pm

Thanks you so much Antonio, that is exactly what I was looking for. Pratik

Permalink Reply by Roig on January 23, 2012 at 5:03am

Hi pratik¡

I think it's easier than the way you are attenpting:

First of all, due to the distance of the sun, it's rays can be reasonabily computed as parallel vectors.

So the thing is: extract the normal vector of each panel, compare its angles with your sun's vector and rotate each one -º.

Could it be that way? if it is, tell me and we can see this.

Regards, Roig

Permalink Reply by Roig on January 23, 2012 at 9:49am

well, there's no much difference if you compute sun rays as parallel or focused, the way would be the same.

Permalink Reply by Kevin Nguyen on March 14, 2012 at 8:42am

Can this definition be turned into a single-axis rotation? Preferably, being able to move in the vertical axis but not in the horizontal axis.  

Permalink Reply by Matthew McFetridge on January 14, 2013 at 3:45pm

Hi Kevin, I have been working on this and here is what I have done. You need the lunchbox grasshopper add-on to flip the surface (go between horizontal and vertical surface orientation), but link a surface and an attractor point and the generated louvers will point their normals towards the attractor point along a singular axis. GH version 9.0014.

This is probably too late but it may help someone else who comes to this thread :)

Matt

Attachments:

• Single Axis Rotation.gh, 10 KB