Best way to create an office room in Matlab

Question

Bobby Punjabi 2022-3-18

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回答： Amish 2023-10-30

Hi,

I want to make an office room to be modelled in Matlab. I was wondering which was the easies way to build structures, using .ply files.

I know for the floor I can use this function:

surf([-1.8,-1.8;1.8,1.8],[-1.8,1.8;-1.8,1.8],[0.01,0.01;0.01,0.01],'CData',imread('woodfloor.jpg'),'FaceColor','texturemap');

Where woodfloor would be just a jpg file that I want to set as the floor, but for putting objects around the room, what would be the best function for that?

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Image Analyst 2022-3-18

Maybe patch()?

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Answer 1

Amish 2023-10-30

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Hi Bobby,

I understand that you are trying to create a 3D model of an office room in MATLAB using .ply files and need a way to place different objects around the room.

You can use the patch function to create and position 3D objects within the room. This method allows you to describe your objects' vertices and faces, specify their appearance parameters, and put them in your 3D scene.

Here is a generic example of showing the use the patch function to place objects within your room:

% Create the room floor as you mentioned
surf([-1.8, -1.8; 1.8, 1.8],[-1.8, 1.8; -1.8,1.8],[0.01,0.01;0.01,0.01],'CData',imread('woodfloor.jpg'),'FaceColor','texturemap');
% Define object vertices and faces (you can import these from .ply files)
object_vertices = ...; % Replace with your object's vertex data
object_faces = ...; % Replace with your object's face data
    
% Position and scale the object
object_translation = [x, y, z]; % Replace with the desired coordinates
object_scale = [scaleX, scaleY, scaleZ]; % Replace with the desired scaling factors
% Create and display the object using patch
patch('Faces', object_faces, 'Vertices', object_vertices * object_scale + object_translation, 'FaceColor', 'g', 'EdgeColor', 'k');

In the code above, the object's vertices and faces are defined and the object's translation and scale within the room is considered for appropriate positioning. Then the patch function is used to create and display the object. You can repeat this process for each object you want to add to your room.

You can import the object's vertex and face data from .ply files using the plyread function.

Additionally, you can also refer to the some of the documentations:

https://www.mathworks.com/help/matlab/visualize/introduction-to-patch-objects.html

https://www.mathworks.com/help/matlab/ref/fill3.html

https://www.mathworks.com/help/matlab/ref/patch.html#:~:text=%C2%A0%20Copy%20Command-,Create%20a%20polygon,-with%20green%20edges

https://www.mathworks.com/matlabcentral/fileexchange/47484-plyread-m#functions_tab

Hope this helps!