Bug associated with Graphics3D???

• To: mathgroup at smc.vnet.net
• Subject: [mg105210] Bug associated with Graphics3D???
• From: Louis Talman <talmanl at gmail.com>
• Date: Tue, 24 Nov 2009 05:50:25 -0500 (EST)
• Reply-to: "Louis Talman A." <talmanl at mscd.edu>

```Can anyone explain why the disk that corresponds to x = 5.1 (see the
last line of the code below) isn't red---like the others?

-------------------------

Rho[Psi_] = 2/(1 - Cos[Psi]);

Para = ParametricPlot3D[
Rho[Psi] {Cos[Psi], Sin[Psi] Cos[Theta], Sin[Psi] Sin[Theta]},
{Psi, Pi/3, Pi}, {Theta, 0, 2 Pi},
PlotStyle -> {Specularity[0.9], Opacity[0.3]}, Mesh -> None,
Axes -> None, PlotRange -> {{-1.3, 6.7}, {-3.5, 3.5}, {-3.5,
3.5}}];

Focus = Graphics3D[{PointSize[0.015], Point[{0, 0, 0}]}];

Bloid = Show[Para, Focus];

Pla[x_] := ParametricPlot3D[
x Sec[Psi] { Cos[Psi], Sin[Psi] Cos[Theta], Sin[Psi] Sin[Theta]},
{Theta, 0, 2 Pi}, {Psi, 0, ArcTan[(2 Sqrt[3])/x]}, Mesh -> None,
Axes -> None, PlotStyle -> {Red, Opacity[0.6]}];

Do[Print[Show[Bloid, Pla[x]]], {x, 4.8, 5.4, 0.1}];

---------------------------

It also happens when x = 3.5, but for no other values of x generated
by {x, 3.0, 6.5, 0.1}.

--Lou Talman
Department of Mathematical and Computer Sciences
Metropolitan State College of Denver

<http://clem.mscd.edu/%7Etalmanl>

```

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