Plane Reversal

I am having trouble with what seems to be a very simple problem. I am trying to control the angle of a 3d vector with two independent orthogonal angle sliders. The x axis slider seems to work just fine but the y axis slider operates sporadically. As you move the y axis slider through +45 or -45 the vector reverses to the opposite side of the origin. If you look closely at the plane its origin is reversing also. Is this a glitch or a user error? Do planes normally switch like this. What is the logic behind plane axis orientation. Is there another way to achieve my goal?

Thanks for your help,
Stan

Attachments:

PLANE REVERSAL.ghx, 124 KB

Replies to This Discussion

Permalink Reply by Chris Wilkins on December 24, 2009 at 9:49am

Since the Plane Normal component only takes the normal vector and a point as input, it must determine the x and y vectors internally - as to how that works I don't know, except to see that it obviously changes something at the point you were hitting at 45 degrees.

Here is a fix that supplies that vector and rotates it initially, eliminating the Plane Normal component. Also I got rid of your degrees to radians calculations by putting "rad(A)" in the A expression for the Rotate Vector.

Attachments:

PLANEREVERSAL2.ghx, 81 KB

Permalink Reply by Stan Carroll on December 24, 2009 at 10:55am

Hey Chris,

That's terrific. Thank you so much. You are amazing. I've been wanting to learn how to use the expression editor as well. That really helps.

Stan

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