rotating lights

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Permalink Reply by Andrew Heumann on August 28, 2012 at 11:06pm

Option 1:

Rhino.DocObjects.LightObject light = doc.Lights[0];

light.LightGeometry.Rotate(ANGLE, Vector3d.ZAxis, Point3d.Origin);
light.CommitChanges();

Option 2:

private void RunScript(Transform xForm, object y, ref object A)
{

Rhino.DocObjects.LightObject light = doc.Lights[0];

light.LightGeometry.Transform(xForm);
light.CommitChanges();

}

Allowing you to pass into xForm the transform output of a rotation component. (or any other transform for that matter.)

Note that both of these will apply the same rotation over and over and over again, so it behaves unlike a typical grasshopper rotation in that adjustments are cumulative rather than re-applied from scratch each time. For finer control over the light's rotation, you might want to specify its position rather than apply a transformation. This would look something like this:

Option 3:

private void RunScript(Point3d Pt, Vector3d Dir, ref object A)
{

Rhino.DocObjects.LightObject light = doc.Lights[0];

light.LightGeometry.Location = Pt;
light.LightGeometry.Direction = Dir;
light.CommitChanges();

}

Dir is only necessary if you're operating on a directional light.

Also all of the above assume that there is exactly 1 light in the document - if you're dealing with more you'll have to be cleverer about how you access the light in question.

Permalink Reply by Benjamin Ennemoser on August 29, 2012 at 1:49am

hi andrew,

thanks for the great help! that works !

best

benjamin