填写Graphics3D对象

Question

Here is a problem that I don't know if can be solved in Mathematica.

(* Courtesy to Lunchtime Playground Blog *)
to3d[plot_, height_, opacity_] :=
Module[{newplot}, newplot = First@Graphics[plot];
newplot = N@newplot /. {x_?AtomQ, y_?AtomQ} -> {x, y, height} /. 
Arrowheads[List[List[x_, y_, notz_]]] -> 
 Arrowheads[List[List[x, y]]];newplot /.GraphicsComplex[xx__] -> {Opacity[opacity], GraphicsComplex[xx]}];
(* A function to combine 2D Graphics object in Mathematica *)
test[list_]:=VectorQ[list,SameQ[Head[#],Graphics]&];
My3DPlot[list_?(test[#]&),height_?(VectorQ[#,NumberQ]&),opacity_?(VectorQ[#,NumberQ]&),opts:OptionsPattern[]]:=Block[{a},a=MapThread[Graphics3D[to3d[#1,#2,#3]]&,{list,height,opacity}];
Show[a,opts]
]
(* List of 2D graphics *)
list=Table[ContourPlot[y+Sin[x^i+i y],{x,-3,3},{y,-3,3},Contours->15,ContourLines->False,ColorFunction->RandomChoice[ColorData["Gradients"]]],{i,{1,2,3,4}}];
(* List of heights where you want to place the images *)
height={-.5,0,.5,1};
(* List of opacities you want to apply to your 2D layers *)
opacity={1,.8,.7,.5};
(* The function inherits all the options of standard Graphics3D as they are passed through the Show command *)
My3DPlot[Reverse@list,height,opacity,Lighting->"Neutral",BoxRatios->{1,1,.9},Axes->True]

Now this returns a cool picture like this one.

Here my question is if it is possible to create a filling for this 2D layers using the same color functions as are used with in the contour plots for example? Target is to fill the hollow between these 2D layers with some light or color that continuously changes according to the neighboring layer color-function.

I hope this can be done in Mathematica but my limited knowledge in Mathematica graphics is making it a difficult hurdle for me.

Answer 1

It should be possible. Texture can be used to generate a 3D texture. The example given in the documentation:

data = Table[{r, g, b}, {r, 0, 1, 1/20}, {g, 0, 1, 1/20}, {b, 0, 1, 1/20}];

Graphics3D[
  {
   Opacity[1/3], 
   Texture[data], 
   EdgeForm[], 
   Polygon[Table[{{0, 0, z}, {1, 0, z}, {1, 1, z}, {0, 1, z}}, {z, 0, 1, 1/20}], 
   VertexTextureCoordinates -> 
    Table[{{0, 0, s}, {1, 0, s}, {1, 1, s}, {0, 1, s}}, {s, 0, 1, 1/20}]]
  },
  Lighting -> "Neutral"
]

This simulates a volume by using a large set of planes. You can do the same. All you have to do is describe the 3D texture, which should interpolate between the planes you already have. Blend would be the function to be used here. For each pixel column in your cube the color varies as Blend[{col1,col2,col3,...},x] with x going from 0 to 1 and coli the color of the pixel in the ith plane given by the contour plots.

The main problem will be that a 3D semi-transparant object with fuzzy color gradients is not something that visualizes very well.