How to create a Lambertian (diffuse) sphere

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Carmine Buonagura
Carmine Buonagura 2020-10-4
回答： Adam Danz 2020-10-5
Hello everyone, I need to generate the image of a Lambertian sphere in Matlab. A Lambertian surface differes from a specular one by the fact that it reflects light in all directions regardless the angle of incidence.
I saw that exists the function
R = diffuse(Nx,Ny,Nz,S)
where Nx, Ny and Nz are the surface's normal vector components. The problem is that I need to generate a sphere.
The result I want to achieve is the following:
The code I've written is:
[x,y,z] = sphere(100);
figure
h = surf(x,y,z,'FaceColor','w','FaceAlpha',1);
set(h,'edgecolor','none');
axis equal
ax = gca; set(ax,'Color','k');
light('Position',[1 0 0],'Style','infinite','Color','w');
lighting gouraud
but the result I get is:

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Adam Danz
Adam Danz 2020-10-5
There are probably official definitions and methods for a Lambertian diffuse sphere but here's something that looks like it.
[x,y,z] = sphere(100);
figure
h = surf(x,y,z,'FaceColor','w','FaceAlpha',1);
set(h,'edgecolor','none');
axis equal
ax = gca; set(ax,'Color','k');
light('Position',[-1 -2 0],'Style','infinite','Color','w');
lighting gouraud
h.BackFaceLighting = 'unlit';
h.DiffuseStrength = .6;
h.SpecularStrength = 0;
h.AmbientStrength = .07;
Potentially relevant literature

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