Thanks for your reply. I ended up using two poly lines to represent the curves and I output them with same number of vertices . I then used a standard surface and assigned a different color with explicit coloring method to the vertices on each curve so I get a nice gradient between the two. It looks great ! Next enhancement is that i would like to draw smooth curves to loft between. Also I would like the coloring to blend into the color of one curve as the other curved gets closer. Right now it's just a linear interpolation it looks like.
Sent from my iPhone > On Mar 3, 2014, at 8:56 AM, Christian Feuersaenger > <cfeuersaen...@googlemail.com> wrote: > > Hi Kevin, > > The question's title hints in direction of "3d surface/patch plotting" and > the question text of sorts "generate a surface between the two" also includes > the keyword "surface". However, the task described in the associated > paragraph could be stated as general question of sorts "I have two curves and > would like to fill the enclosed area - how can I do this?". > > The reason why I am asking this question is: pgfplots 1.10 is about to be > released (that means within the next days). And it will come with one major > feature, namely the ability to fill the area enclosed by two arbitrary > curves. However, this kind of filling is two--dimensional in its nature, and > it would have constant color (or a pattern/shading which is independent of > the curve data). This new "fillbetween" feature will probably work out of the > box, its syntax will be "\addplot fill between[of=A and B];" where "A" and > "B" are sort of labels for the two input curves. > > You may want browse through the pdf manual of the release candidate > http://pgfplots.sourceforge.net/pgfplots_unstable.pdf (section "Libraries >> > Fill Between"). > > *If* that is satisfies your needs, you can simply wait for a couple of days > and download that new version (announcements will be sent to this list). > > If you really need a surface (probably with interpolated color data), then we > would need to come back to your problem at hand. My first assessment would be > that you'd need to triangulate the area manually and visualize the resulting > triangles by means of a surf or patch plot. In other words: you have to come > up with a suitable sequence of patches (perhaps triangles as the most simple > ones) on your own; the visualization as mesh or surface would be done by > pgfplots. A related solution could be > http://tex.stackexchange.com/questions/91689/visualize-data-on-a-variable-radius-graph-network/93858#93858 > . > Clearly, this approach would benefit from a good set of sampling points for > both input curves. The triangulation could be done in your external program > which generates the points. > > If you need help on this second topic (perhaps about the expected input > format), you can post another question here, optimally with a minimal working > example. > > Kind regards > > Christian > > > Am 28.02.2014 21:28, schrieb Kevin Smith: >> Hello, >> >> I have started to experiment with pgfplots for plotting some 3-d data that I >> would like to visualize. >> >> What I would like to do seems like it should be simple, but perhaps I need a >> little bit of direction from the experts on which approach I should take. >> >> I have two 3D curves which are each represented by an array of (x,y,z) data. >> So far, I have learned enough to where I can plot the curves individually in >> a graph using addplot3 and I have been able to export my data so that it is >> in a nice text format for addplot3 coordinate syntax.. >> >> One view of this data would be simply to show the two curves in the graph >> but in different colors with their own label. That should be fairly simple. >> >> As an extension of this, I would wonder if it would be possible to generate >> a surface between the two curves so that the gaps or differences between the >> two curves could be better visualized. I have tried various patch example >> settings in the gallery but none of them seem to give what I want. Since the >> 2 curves are somewhat similar, the desired result would be that the surface >> would look like a "ribbon" between the curves, where the ribbon might vary >> in width, depending on the gap between the curves. >> >> Another issue is that the two curves can each have a different number of >> points. I could potentially interpolate the curves before I export them, so >> that the data for each curve will be of the same dimension if that makes it >> easier. >> >> Thanks in advance for any suggestions… >> >> >> >> >> ------------------------------------------------------------------------------ >> Flow-based real-time traffic analytics software. 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