Select only vertical faces of the EditableMesh object

Submitted by harumscarum on Mon, 2023-06-05 02:12

Is there any solution to select vertical faces of the Editable Mesh object?

‹ MaxScript for Unwrap UVW ELEMENT WITH HIGHEST POLYGONS NUMBER COUNT IN ONE OBJECT ›

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harumscarum's picture
Submitted by harumscarum on Mon, 2023-06-05 03:43.

ChatGPT did the job, however

ChatGPT did the job, however it do not know how to select faces, may only delete it
and it is slow

-- Assuming you have the EditableMesh object selected
obj = selection[1]
 
-- Get the number of faces
numFaces = obj.numFaces
 
-- Iterate through faces in reverse order
for f = numFaces to 1 by -1 do
(
    -- Get the normal of the face
    faceNormal = getFaceNormal obj f
 
    -- Check if the face is vertical
    if dot faceNormal [0, 0, 1] < 0.99 do
    (
        -- Delete the face
        deleteFace obj f
    )
)
miauu's picture
Submitted by miauu on Mon, 2023-06-05 23:16.

.

The code you have will delete bottom faces of a box primitive converted to Editable Mesh.

(
	obj = selection[1]	
	if classOf obj == Editable_mesh do
	(
		vertFacesBA = #{}
		numFaces = obj.numFaces
		for f = 1 to numFaces where ( dot (fNormal = getFaceNormal obj f) [0, 0, 1] < 0.99 ) and (dot fNormal [0,0,1] > -0.99) do vertFacesBA[f] = f		
		if vertFacesBA.numberset != 0 then
		(
			select obj
			max modify mode
			subobjectlevel = 3
			setFaceSelection obj vertFacesBA
		)
		else
			messagebox "No vertical faces has been found" title:""
	)
)

Tools and Scripts for Autodesk 3dsMax

jahman's picture
Submitted by jahman on Wed, 2023-06-07 03:13.

.

it might be faster to use abs to make just a single value comparison
like that:

...
for f = 1 to numFaces where (abs (dot (getFaceNormal obj f) z_axis)) < 0.99 do vertFacesBA[f] = true
...

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