<div dir="ltr">Hi Drak,<div><br></div><div>Generally it's better design to build a transform or matrix and then apply that to the actor via SetUserTransform() or SetUserMatrix(). That way, the transform or matrix is available to you if you have to move other points or actors between coordinate systems.</div><div><br></div><div>To rotate around a point in space, you have to apply a translation to put that point at the origin, then do the rotation, and then translate back again.</div><div><br></div><div> - David<br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Aug 10, 2015 at 10:53 AM, Drak <span dir="ltr"><<a href="mailto:draktharrblorf@gmail.com" target="_blank">draktharrblorf@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I should add that I'm using the vtkImageActor with a vtkImageData as a<br>
source. It seems that my point of rotation is the bottom left of my image<br></blockquote></div></div></div></div>