What function other than colormap can display an image as a texture-mapped surface?

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Trini Inouye 2016-3-16

0
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评论： Trini Inouye 2016-3-16

I already know how to wrap one image around a sphere, but once I introduce a second image into my code, I lose the first one. I believe it's because the colormap command is using the map from my second image (earth) instead of holding on to the first (sun). I've been told that trying to have multiple colormaps would be unnecessarily complicated and that there is another function that I can use instead, but I haven't been able to figure out which function I'm supposed to use.

    for n = 1:numberOfPlanets
        if n == 1
            image = imread('sun.jpg');
        else
            image = imread('earth.jpg');
        end
        [indexed_image,map] = rgb2ind(image,256);
        hold on
        [x,y,z] = sphere;
        planets = surf(x*Planet(n).Radius.r+Planet(n).Position.x,...
            y*Planet(n).Radius.r+Planet(n).Position.y,...
            z*Planet(n).Radius.r+Planet(n).Position.z,...
            flipud(indexed_image),...
            'FaceColor','texturemap',...
            'EdgeColor','none',...
            'CDataMapping','direct');
        colormap (map)
        hold off
    end

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Answer 1

Mike Garrity 2016-3-16

3
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In this example, you don't need colormaps at all. Just use the RGB images as the textures.

for n = 1:numberOfPlanets
      if n == 1
          image = imread('sun.jpg');
      else
          image = imread('earth.jpg');
      end
      hold on
      [x,y,z] = sphere;
      planets = surf(x*Planet(n).Radius.r+Planet(n).Position.x,...
                     y*Planet(n).Radius.r+Planet(n).Position.y,...
                     z*Planet(n).Radius.r+Planet(n).Position.z,...
                     flipud(image),...
                    'FaceColor','texturemap',...
                    'EdgeColor','none');
      hold off
  end