Not the correct color on volshow

Question

Matteo Bonhomme 2023-4-19

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https://ww2.mathworks.cn/matlabcentral/answers/1949778-not-the-correct-color-on-volshow

评论： Matteo Bonhomme 2023-10-9

采纳的回答： Sufiyan

在 MATLAB Online 中打开

Hello,

I have this code

V_test=zeros(100,100,100);
V_test(10:20,10:20,10:20)=deal(1);
V_test(80:90,10:20,10:20)=deal(2);
V_test(45:55,45:55,45:55)=deal(3);
value=0:3;
color=[0,0,0;1,0,0;0,1,0;0,0,1];
queryPoints=linspace(min(value),max(value),256);
colormap = interp1(value,color,queryPoints);
figure(1)
myvol=volshow(V_test,Colormap=colormap);

I want the grey cube to be blue. It is blue on certain angle wich lead me to think it's a reflection issue but I'm not sure at all.

If anyone who's more familiar with volume rendering can help me that would be gratly appreciated :)

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Answer 1

Sufiyan 2023-4-27

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https://ww2.mathworks.cn/matlabcentral/answers/1949778-not-the-correct-color-on-volshow#answer_1224119

在 MATLAB Online 中打开

Hi,

You can refer to the below code.

V_test=zeros(30,30,30);
% first cube
V_test(10:20,10:20,10:20)=1;
% second cube
V_test(80:90,10:20,10:20)=2;
% third cube
V_test(45:55,45:55,45:55)=3;
value=0:3;
color=[0,0,0;0.2,0.8,0;0,0,1;1,0,0]; 
queryPoints=linspace(min(value),max(value),256);
colormap = interp1(value,color,queryPoints);
figure(1)
myvol=volshow(V_test,'Colormap',colormap);
% Change the rendering method to MIP
myvol.RenderingStyle = 'VolumeRendering';
% Adjust the view angle of the MIP projection
view([30,30]);