Hi Keving, sounds great. If you like, you can send us a reduced example!
Regarding "smooth curves": I do not understand the requirement of "curves to loft between"... but I am sure you will find a solution. The color interpolation order is 1 (linear interpolation), that is correct. The only way to overcome this limitation would be to add more samples, i.e. to modify your triangulation add add more color values in the middle. Note that even the patchplots library has first order color interpolation, even if the geometry supports up to third order interpolation. Kind regards Christian Am 03.03.2014 18:29, schrieb Kevin Smith: > 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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