plotting - Smooth ParametricPlot3D with RegionFunction?

What's the preferred way to paint spots on a curved surface without getting raggedy edges? Using ParametricPlot3D with RegionFunction gets the shape I want but increasing PlotPoints slows things down considerably. Counterintuitively Reducing PlotPoints to 50 gives better looking results than 100:

With[{a = 0.8, b = 0.4, r = 5^0.5, l = 10, points = 50}, 
 ParametricPlot3D[{{x, -Sqrt[r^2 - x^2], z}, {x, Sqrt[r^2 - x^2], 
    z}}, {x, -r, r}, {z, -l/2, l/2}, 
  RegionFunction -> 
   Function[{x, y, z}, (x/a)^2 + (z/b)^2 < 1 && y > 0], Mesh -> None, 
  PerformanceGoal -> "Quality", PlotPoints -> points]]

First image has points =50, second image has points = 100.

Answer

What's the preferred way to paint spots on a curved surface without getting raggedy edges?

I use MeshFunctions, MeshShading, and Mesh:

Show[
 (* Head *)
 ParametricPlot3D[
  (1 + 0.05 Cos[u]) {Sin[u] Cos[v], Sin[u] Sin[v], 0} + {0, 0, 1.05 Cos[u]},
  {u, 0, π}, {v, 0, 2 π},
  (* mouth *)

  MeshFunctions -> {Function[{x, y, z, u, v}, x + 0.5 (2 y^2 - 2 (z + 0.5))^2]},
  MeshShading -> {Black, Lighter@Red, Yellow},
  Mesh -> {{-0.85, -0.82}},
  (*****)
  AxesLabel -> {"x", "y", "z"}, PlotPoints -> 100],
 (* Eyes *)
 ParametricPlot3D[
  Sin[1.9 (u - 0.45)]^2 (0.36 + 0.8 (Sqrt[0.5 + 2 Abs[v]])) Cos[1.5 v] *
     {-Sin[u] Cos[v], -Sin[u] Sin[v], Cos[u]},
  {u, π/6, π/2}, {v, -π/6, π/6},

  (* pupil & iris *)
  MeshFunctions -> {Function[{x, y, z, u, v}, 
     Sin[1.9 (u - 0.49)]^2 (0.36 + 0.8 (Sqrt[0.5 + 2 Abs[v]])) Cos[1.5 v]]},
  MeshShading -> {White, Lighter@Blue, Black},
  Mesh -> {{1.06, 1.077}},
  (*****)
  AxesLabel -> {"x", "y", "z"}, PlotPoints -> 100],
 (* Tongue *)
 ParametricPlot3D[
  {-u, 0, -u^2/4 - 0.15} + 0.15 Sqrt[Sqrt[(1.2 - u)]] *

     (2 Cos[v] {0, 1, 0} + Sin[v] {-u/2, 0, 1 - 0.5 Sin[v]}/Sqrt[u^2 + 1]),
  {u, 0.5, 1.2}, {v, 0, 2 π}, PlotStyle -> Red, Mesh -> None],
 PlotRange -> All
 ]

Mathematica graphics

It has the advantage of having borders that meet each other exactly. (Pasting a surface patch on another surface usually requires a small gap between them, or rounding error in the GPU causes the image to shimmer.)

Comments

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plotting - Plot 4D data with color as 4th dimension

I have a list of 4D data (x position, y position, amplitude, wavelength). I want to plot x, y, and amplitude on a 3D plot and have the color of the points correspond to the wavelength. I have seen many examples using functions to define color but my wavelength cannot be expressed by an analytic function. Is there a simple way to do this? Answer Here a another possible way to visualize 4D data: data = Flatten[Table[{x, y, x^2 + y^2, Sin[x - y]}, {x, -Pi, Pi,Pi/10}, {y,-Pi,Pi, Pi/10}], 1]; You can use the function Point along with VertexColors . Now the points are places using the first three elements and the color is determined by the fourth. In this case I used Hue, but you can use whatever you prefer. Graphics3D[ Point[data[[All, 1 ;; 3]], VertexColors -> Hue /@ data[[All, 4]]], Axes -> True, BoxRatios -> {1, 1, 1/GoldenRatio}]

plotting - Mathematica: 3D plot based on combined 2D graphs

I have several sigmoidal fits to 3 different datasets, with mean fit predictions plus the 95% confidence limits (not symmetrical around the mean) and the actual data. I would now like to show these different 2D plots projected in 3D as in but then using proper perspective. In the link here they give some solutions to combine the plots using isometric perspective, but I would like to use proper 3 point perspective. Any thoughts? Also any way to show the mean points per time point for each series plus or minus the standard error on the mean would be cool too, either using points+vertical bars, or using spheres plus tubes. Below are some test data and the fit function I am using. Note that I am working on a logit(proportion) scale and that the final vertical scale is Log10(percentage). (* some test data *) data = Table[Null, {i, 4}]; data[[1]] = {{1, -5.8}, {2, -5.4}, {3, -0.8}, {4, -0.2}, {5, 4.6}, {1, -6.4}, {2, -5.6}, {3, -0.7}, {4, 0.04}, {5, 1.0}, {1, -6.8}, {2, -4.7}, {3, -1.

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