My initial reaction to your message is that this is far too big of a test case to hand over to someone else. Is there some way we can get you access to a machine that demonstrates the problem so you can make something smaller?<div> </div><div>Robby On Monday, December 30, 2013, Neil Toronto wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I don't think there's anything I can look into. I can't duplicate the problem on my system, and Plot doesn't do anything platform-specific, so the bug is almost certainly in `pict', `racket/draw' or Cairo. Matthew? Sorry I wasn't clear on this earlier. (It could be that it's *possible* duplicate it on my system, and that it only shows up on the build machine because the default font is a different size, which gives the plot areas slightly different sizes, which gives the projected triangles slightly different vertices. I could look into that, but it seems unlikely. I use Plot a *lot* and have never seen this before.) If I were debugging it, I'd try to find the simplest plot that's missing a polygon. Here are the bad plots from the docs, rendered the way the docs do it (plot to a pict, then convert to a bitmap), with the number of samples easy to tweak: #lang racket (require pict plot/pict) (plot3d-samples 41) ; default is 41 (parameterize ([plot-z-ticks (currency-ticks)]) (pict->bitmap (plot3d-pict (contour-intervals3d (λ (x y) (- (sqr x) (sqr y))) -1 1 -1 1 #:label "z") #:legend-anchor 'center))) (pict->bitmap (plot3d-pict (polar3d (λ (θ ρ) 1) #:color 2 #:line-style 'transparent) #:altitude 25)) I'd also try passing #:out-file "out.pdf" to `plot3d-pict' to see if the PDF back-end is afflicted. I don't know how worried to be about missing polygons. It could be anything from bad array management in Cairo (which could be serious) to a mostly harmless problem in the implementation of region culling or winding rules. Neil ⊥ On 12/29/2013 09:39 PM, Robby Findler wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Neil: have you had time to look into this? If not, then I think we should just leave it for the next release. Please let us know what you're thinking about this one. Robby On Sat, Dec 21, 2013 at 4:13 PM, Neil Toronto <<a>neil.toronto@gmail.com</a> <mailto:<a>neil.toronto@gmail.com</a>>> wrote: Some plots in the documentation are missing a polygon. I think it's platform-specific, because I can't reproduce the problem. Examples: First example plot in "1.5 Renderer and Plot Bounds" (look for a light green rectangle) file:///usr/racket-5.91.0.900/__doc/plot/intro.html?q=plot#%__28part._.Renderer_and_.Plot_.__Bounds%29 Last example plot in `plot-z-far-ticks' docs (look for a white hole under the "z" in the legend) <a href="http://plt.eecs.northwestern." target="_blank">http://plt.eecs.northwestern.</a>__edu/snapshots/current/doc/__plot/ticks_and_transforms.__html?q=plot-z-far-ticks#%__28def._%28%28lib._plot%2Fmain.__.rkt%29._plot-z-far-ticks%29%__29 <<a href="http://plt.eecs.northwestern.edu/snapshots/current/doc/plot/ticks_and_transforms.html?q=plot-z-far-ticks#%28def._%28%28lib._plot%2Fmain..rkt%29._plot-z-far-ticks%29%29" target="_blank">http://plt.eecs.northwestern.edu/snapshots/current/doc/plot/ticks_and_transforms.html?q=plot-z-far-ticks#%28def._%28%28lib._plot%2Fmain..rkt%29._plot-z-far-ticks%29%29</a>> Here's a program that renders one of the bad plots like Scribble does (I think): #lang racket (require pict plot/pict) (pict->bitmap (plot3d-pict (polar3d (λ (θ ρ) 1) #:color 2 #:line-style 'transparent) #:altitude 25)) Neil ⊥ _________________________ Racket Developers list: <a href="http://lists.racket-lang.org/__dev" target="_blank">http://lists.racket-lang.org/__dev</a> <<a href="http://lists.racket-lang.org/dev" target="_blank">http://lists.racket-lang.org/dev</a>> </blockquote> </blockquote></div>