<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Okay, I'm assuming that these points correspond in </div><div>time, correct? For example, point 937 in time point 0</div><div>corresponds to point 937 in time point 1, 2, 3, ...133,</div><div>right? </div><div><br></div><div><br></div><br><div><div>On Jan 3, 2012, at 11:55 AM, Kerstin Müller wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hi,<br><br>the basic problem I wanna solve:<br><br>I'll have scattered points in 3D which vary over time, they describe a motion of a surface over time. They are not ordered in x-y-and z-dimension.<br>Now I want to represent that motion by BSplines in order to generate a dense motion vector field defined on specific 3D voxel positions.<br>
I'll have 133 timesteps and ~960 sample points in each time step. Now I want to fit the BSpline to it and resample it.<br><br>All the best,<br><br>Kerstin<br><br><div class="gmail_quote">2012/1/3 Nicholas Tustison <span dir="ltr"><<a href="mailto:ntustison@gmail.com">ntustison@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">In that case, let's start with the basic problem set-up.<div>Before, you described your problem as follows:<div class="im">
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<div><div>I'm using the<span> </span><b>BSplineScatteredDataPointSetToImageFilter<span> </span></b>from the Insight Journal. However,<br>I cannot find the correct parameter in order to make the filter work and does not crash during the evaluation.<br>
I'll have scattered 3-D points over time and I want to fit a 4-D Bspline field to that points. Afterwards I want to evaluate the Bspline on a dense volume grid to one time step.</div></div></blockquote></span></blockquote>
</div></div></div></div><div><br></div><div>What do these scattered 3D+t points represent? </div><div>Is it a curve, a time-varying scalar field, or something</div><div>else?</div><div><br></div></div></blockquote></div>
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