[Closed] Grow face(poly) selection by edge angle

Dec 10, 2014 10:19 pm

i don’t really work a lot with max modeling and could missed something. is there a built-in max tool(solution) which does growing selection of faces based on specified edge angle threshold with neighbor faces?
i believe it’s not hard to write this tool but i don’t want to do what already done.

a maxscript solution probably can’t work for me. i’m talking about very high-res models (from ZBrush). it’s usually couple millions of triangles.

6 Replies

Malkalypse

Dec 10, 2014 10:19 pm

I don’t believe there is anything in Max that does exactly what you are describing, though I could be mistaken. If the meshes you are importing are quad-based, you can probably just use the grow loop tool from the Graphite toolset. Otherwise you will probably have to look elsewhere for a solution or write your own.

denisT

Dec 10, 2014 10:19 pm

in general my models are not ‘quad-guarantied’

broomy

Dec 10, 2014 10:19 pm

there is the “By Angle” option in the face selection mode of an editable poly, or “Ignore visible edges” option in editable mesh, should do what your looking for

denisT

Dec 10, 2014 10:19 pm

thanks… i know about these methods but i want to select faces in growing mode (only connected faces) with continue check of neighbor edge angles. for example this method has to select all faces of a geosphere with angle threshold higher than an angle for any edge shared by two faces…

Klvnk

Dec 10, 2014 10:19 pm

this is the source code for editable poly grow selections

void EditPolyObject::EpfnGrowSelection (int mnSelLevel) {
	if (mnSelLevel == MNM_SL_CURRENT) mnSelLevel = meshSelLevel[selLevel];
	DbgAssert (mm.GetFlag (MN_MESH_FILLED_IN));
	if (!mm.GetFlag (MN_MESH_FILLED_IN)) return;
	BitArray newSel;

	switch (mnSelLevel) {
	case MNM_SL_VERTEX:
		mm.ClearEFlags (MN_USER);
		mm.PropegateComponentFlags (MNM_SL_EDGE, MN_USER, mnSelLevel, MN_SEL);
		newSel.SetSize (mm.numv);
		for (int i=0; i<mm.nume; i++) {
			if (mm.e[i].GetFlag (MN_USER)) {
				newSel.Set (mm.e[i].v1);
				newSel.Set (mm.e[i].v2);
			}
		}
		SetVertSel (newSel, this, TimeValue(0));
		break;

	case MNM_SL_EDGE:
		mm.ClearVFlags (MN_USER);
		mm.PropegateComponentFlags (MNM_SL_VERTEX, MN_USER, mnSelLevel, MN_SEL);
		newSel.SetSize (mm.nume);
		for (int i=0; i<mm.nume; i++) {
			if (mm.v[mm.e[i].v1].GetFlag (MN_USER) || mm.v[mm.e[i].v2].GetFlag (MN_USER))
				newSel.Set (i);
		}
		SetEdgeSel (newSel, this, TimeValue(0));
		break;

	case MNM_SL_FACE:
		mm.ClearVFlags (MN_USER);
		mm.PropegateComponentFlags (MNM_SL_VERTEX, MN_USER, mnSelLevel, MN_SEL);
		newSel.SetSize (mm.numf);
		for (int i=0; i<mm.numf; i++) {
			for (int j=0; j<mm.f[i].deg; j++) {
				if (mm.v[mm.f[i].vtx[j]].GetFlag (MN_USER)) 
				{
					newSel.Set (i);
					break;
				}
			}
		}
		SetFaceSel (newSel, this, TimeValue(0));
		break;
	}
	macroRecorder->FunctionCall(_T("$.EditablePoly.GrowSelection"), 0, 0);
	macroRecorder->EmitScript ();
	LocalDataChanged (PART_SELECT);
}

and theres a MN_EDGE_NOCROSS edge flag that can be set with the following function

DllExport void MNMesh::FenceNonPlanarEdges  (  float  thresh = .9999[f]( http://forums.cgsociety.org/class_m_n_mesh.html#o2),    
 
 bool  makevis = FALSE  
 )

may some kind of combi would do the trick in a slick million poly+ kind of way ?