[Closed] Getting vertex selection from modifier. QUICKLY

Oct 02, 2020 12:18 am

My task is simple – I have an editable poly (or editable mesh, it’s not vital) with volume_select modifier, I have a rule to move its gizmo and I need to get vertex selection from this modifier.
The bad news is that model is about 1.5m tris and I need to do that few thousand times.
The best solution I have found is to read
<object>.mesh.selectedverts
But reading this data from object is DEADLY SLOW and calculating whole task takes hours.
Is there any other method to read modifier’s selection data?

5 Replies

Serejah

Oct 02, 2020 12:18 am

use getVertSelection

denisT

Oct 02, 2020 12:18 am

Serejah, you can try with c# SDK…

the fastest SDK way to get current trimesh vertex selection is:

node > EvalWorldState > TriObject > mesh > VertSel

all built-in MXS methods are really slow

Serejah

Oct 02, 2020 12:18 am

I didn’t do much tests, but in 2014 it is pretty fast
And it is also dependent on command panel mode

bits = #()
for mode in #( #create, #modify ) do
(	
	setCommandPanelTaskMode mode
		
	delete objects
	tri = plane widthsegments:850 lengthsegments:850 isSelected:true
	convertToMesh tri
	vs = Vol__Select ()
	vs.level = 1
	vs.volume = 4
	vs.texture = Dent size:100
	vs.method = 0
	addModifier tri vs


		
		
	t1=timestamp();hf = heapfree
			
		vsel = getVertSelection tri
		
	format "Mode:% Time: %sec. Mem: %\n" mode ((timestamp()-t1)/1000 as float) (hf-heapfree)
	
       -- LEAKS MEMORY
	t1=timestamp();hf = heapfree
	
		g = (dotNetClass "Autodesk.Max.GlobalInterface").Instance	
		inode  = g.COREInterface14.GetINodeByHandle tri.inode.handle asdotnetobject:true
		iobj   = inode.evalworldstate (currenttime as integer) true asdotnetobject:true
		iobj.obj.Mesh_.VertSel	
	
	format "C# sdk vsel Time: %sec. Mem: %\n\n" ((timestamp()-t1)/1000 as float) (hf-heapfree)
	
	
	append bits vsel
)

bits[1].numberset == bits[2].numberset
(bits[1] - bits[2]).IsEmpty and (bits[2] - bits[1]).IsEmpty

Mode: #create Time: 1.333sec. Mem: 192L
C# sdk vsel Time: 0.673sec. Mem: 944L

Mode: #modify Time: 0.008sec. Mem: 192L
C# sdk vsel Time: 0.074sec. Mem: 944L