How can we calculate the interior dimensions of a model imported into a three.js scene? Using the example of a rectangular barn with walls of varying thickness, what would be the best approach to determine the inner bounding box?
I have attempted to use a Box3 and set its dimensions directly from the object using Box3's setFromObject method. While this works for a standard bounding box, I am struggling to find a method to calculate the inside bounding box of an object.
Utilize model slicing as a method to simplify the issue from 3D to 2D.
STEP 1 - segment the model using N horizontal planes → resulting in N shapes in 2D space, each with its own Z height.
STEP 2 - for each slice:
https://i.sstatic.net/CiJed.png
STEP 3 - Once you have a collection of rectangles, merge them to form the inner volume:
The inner volume will take the shape of the smallest common rectangle.
Analyze which rectangles contribute to determine the min(Z) and max(Z) of the given shape.
https://i.sstatic.net/0XMTs.png
OPTIMIZING to achieve maximum volume
The inner volume can be expanded by excluding certain slices or introducing new ones. For instance, if we have an inner diamond shape, calculating max(Z) and min(Z) could result in a narrow column that may not yield the optimal volume in this scenario.
Eliminating slices from the top and bottom can enhance the outcomes. Hopefully, you grasp the concept despite my limited artistic abilities!
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