Exploring the World of Three.js: Modifying Facial Structures

Can anyone help me figure out how to obtain the average x, y, z coordinates of a specific face in three.js? Or, could someone guide me on extracting the individual x, y, z coordinates of the three vertices that compose a face and averaging them?

Currently, I have this:

var fLength = plane.geometry.faces.length;
for (var i = 0; i < fLength; i++) {
    var f = plane.geometry.faces[i];
    //How can I retrieve the x, y, z coordinates of the current/i face?
    //Is there a way to manipulate this face's position?
    //Are there methods for extruding or performing any other operations on the face?
}

Furthermore, I am curious if there are alternative ways to move a face without directly manipulating its vertices. Is there a method for extruding faces as well? I know it's a lot of questions, but the whole process appears a bit unclear to me...

Answer №1

Face3 objects in Three.js have properties a, b, and c, which are indices that point to vertices in the geometry array. For instance, you can use

v1 = plane.geometry.vertices[f.a];

to access the position of the first vertex in the face as a Vector3.

When it comes to modifying geometry in Three.js, the library doesn't provide many built-in methods for this purpose. Similar to other graphics APIs, Three.js focuses on efficiently rendering static scenes (excluding vertex shader operations).

To make changes to geometry, you may need to update individual vertices and adjust dirty flags accordingly. In some cases, you might even need to rebuild faces if your modifications affect edges. Depending on your requirements, implementing modifications with a vertex shader could be a more efficient approach.

Overall, manipulating geometry in Three.js can be complex. If you have specific questions or need assistance with a particular operation, don't hesitate to ask for help detailing your desired modifications.

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