It runs fine for me on Racket Version 5.2 [3m], 64-bit, under Windows 7, with or without the commented lines. I can try on my work machine using the nightly build in the morning. But I work the plot package pretty heavily there (using a recent nightly build) with no problems. <div class="gmail_quote">On Tue, Dec 6, 2011 at 3:13 AM, Marijn <<a href="mailto:hkBst@gentoo.org">hkBst@gentoo.org</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 So I just wanted to repost this to dev for the record. The program: ;== start #lang racket (require plot) ;(plot3d-diffuse-light? #f) ;(plot3d-specular-light? #f) (plot3d (list (surface3d (ë (x y) (+ (sqr x) (sqr y))) -1 1 -1 1 #:label "z = x^2 + y^2") (surface3d (ë (x y) (- (+ (sqr x) (sqr y)))) -1 1 -1 1 #:color 4 #:line-color 4 #:label "z = -x^2 - y^2"))) ;== end produces: inexact->exact: no exact representation for +nan.0 but when the commented lines are uncommented it does plot. The plot looks plausible, though apparently it should be possible to drag inside the plot area to change the view. This is not possible for me; the view is stuck from looking along the xy-plane onto the z-axis. Matthew has been trying to determine the cause via private email. Matthew, has any of the data I provided so far pointed you anywhere? Otherwise is there something else I can do to help debug? Marijn -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) Comment: Using GnuPG with Mozilla - <a href="http://enigmail.mozdev.org/" target="_blank">http://enigmail.mozdev.org/</a> iEYEARECAAYFAk7d6uIACgkQp/VmCx0OL2yVAQCdEaRC6AuBfrbUtFBXDJF4uBVh lJYAoIfI1nkHSURKjhdNeN4qX13I2vnm =NTTc -----END PGP SIGNATURE----- _________________________________________________ For list-related administrative tasks: <a href="http://lists.racket-lang.org/listinfo/dev" target="_blank">http://lists.racket-lang.org/listinfo/dev</a></blockquote></div>