how to make color and lighting continuouse using patch

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Itzik Ben Shabat
Itzik Ben Shabat 2013-12-1
回答： Meg Noah 2025-8-5
Hi, im trying to visualize 3d objects in MATLAB. when i used the following script i wrote
clear all;
close all
clc
vertices=[0 0 0; 1 0 0; 1 1 0 ;0 1 0; 0 0 1; 1 0 1; 1 1 1; 0 1 1];
faces=[1 2 6 5; 2 3 7 6; 3 4 8 7;4 1 5 8; 1 2 3 4;5 6 7 8];
FV.vertices = [vertices;vertices+[ones(8,1) zeros(8,2)]];
FV.faces = [ faces ; faces+8*ones(6,4)];
FV.FaceVertexCData=0.5*ones(size(FV.vertices,1),3);
figure;
patch_handle=patch('Vertices',FV.vertices,'faces',FV.faces,'FaceVertexCData',FV.FaceVertexCData,'facecolor','interp','facelighting','phong',...
'edgecolor','none','edgelighting','phong');
set(patch_handle,'AmbientStrength',0.8,'DiffuseStrength',0.5,'SpecularStrength',0.5);%,'FaceAlpha',0.5);
light('Position',[1 1 1]);
view(45 ,45);
axis equal
i get that the lighting is not continuous (instead of one continuouse cuboidi can see 2 separate cubs. how do i avoid this ? In the writing of this code i used the following help docs Multiple Patches Specifyingpatch clor thank you

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回答（1 个）

Meg Noah
Meg Noah 2025-8-5
Try this:
clear all;
close all
clc
vertices=[0 0 0; 1 0 0; 1 1 0 ;0 1 0; 0 0 1; 1 0 1; 1 1 1; 0 1 1];
faces=[1 2 6 5; 2 3 7 6; 3 4 8 7;4 1 5 8; 1 2 3 4;5 6 7 8];
FV.vertices = [vertices;vertices+[ones(8,1) zeros(8,2)]];
FV.faces = [ faces ; faces+8*ones(6,4)];
FV.FaceCData=0.5*ones(size(FV.faces,1),3);
figure();
shading interp
grey = [0.5 0.5 0.5];
s = trisurf(FV.faces,FV.vertices(:,1),FV.vertices(:,2),FV.vertices(:,3), ...
'Facecolor',grey,'FaceAlpha',1,'EdgeColor','none');
material(s, 'dull');
axis equal
colormap(gray);
s.EdgeColor = 'none';
s.FaceLighting = 'gouraud';
s.SpecularStrength = 0.01;
s.SpecularExponent = 1;
s.DiffuseStrength = 0.8;
s.AmbientStrength = 0.3;
s.BackFaceLighting = 'lit';
for ilight = 0:60:359
lightangle( 0, ilight)
end
axis equal

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