How can I extract lighting information from a face in a patch object?

1) I create a 3D matrix represented by 10's and 0's and say make it a cube. Then I can plot the cube using something like PATCH_array3D to get a patch representation of the voxel set.

2) I insert light source at say light('Position', [0 0 1], 'Style', 'infinite');

3) I edit the properties of my patch object such that Lighting.BackFaceLighting is 'unlit'.

Now I have an illuminated patch object. My question is: Is there a way to extract which faces are lit up from the properties of the patch object? I'm guessing it has something to do with Data.VertexNormals, but I don't understand what data is contained there.

If you need to see a little code to understand what I'm talking about, I can provide this, but I think my question is fairly general.

[Shurui Zhang]

Hi Alex,

I came across the same question here, where I need to extracted plotted face patch data with different lighting conditions. The "light" or "lightangle" command after plot seem to be only a post-processing visualization step. I wonder if you have solved this problem and could probably share with me?

Thanks!

Shurui