I'm trying to bridge polygon selections on a single merged object, but it keeps returning False.

My setup:

• Single polygon object (2 cylinders under a Connect, then Connect+Delete)
• Two polygon selection tags with different names on the merged object
• Polygon mode (MODELINGCOMMANDMODE_POLYGONSELECTION)

All settings:

python  settings[MDATA_BRIDGE_RESTRICT] = True
settings[MDATA_BRIDGE_OBJINDEX1] = merged_obj
settings[MDATA_BRIDGE_OBJINDEX2] = merged_obj
settings[MDATA_BRIDGE_OBJINDEX3] = merged_obj
settings[MDATA_BRIDGE_OBJINDEX4] = merged_obj
settings[MDATA_BRIDGE_ELEMENT1] = 48  # First polygon of source selection
settings[MDATA_BRIDGE_ELEMENT2] = 56  # Last polygon of source selection
settings[MDATA_BRIDGE_ELEMENT3] = 19  # First polygon of target selection
settings[MDATA_BRIDGE_ELEMENT4] = 30  # Last polygon of target selection
//+ subdivision, tension, mode, etc.

The bridge tool returns False. The selections are verified to exist on the object (9 polygons at indices 48-56, and 12 polygons at indices 19-30).

Questions:

• Do all MDATA_BRIDGE_OBJINDEX# need to be filled when bridging in polygon mode ?
• Do I need to apply the selections to the active BaseSelect, or should they only be in tags?
• Are there other required parameters for polygon mode ?
• Does RESTRICT=True have any meaning when using the tool programmatically ?
• If MDATA_BRIDGE_DELETE is "Keep Original Polygons" when bridging polygons then what is the MDATA_BRIDGE_KEEP_POLYGONS ?

Thanks!

Thank you for reaching out to us. The bridge tool in Cinema supports (in point mode) up to four objects as inputs. MDATA_BRIDGE_OBJINDEX1 to MDATA_BRIDGE_OBJINDEX4 are BaseLink parameters where you must link the PolygonObject instances you want to bridge. When you want the common case of bridging within one object, you set the same object for all four slots.

MDATA_BRIDGE_ELEMENT1 to MDATA_BRIDGE_ELEMENT4 are then the element (e.g. point) indices to bridge (which can be scattered over multiple objects). They will be evaluated in relation to what you have set for the object indices.

MDATA_BRIDGE_DELETE is "Delete Original Polygons" when you are bridging polygons in polygon mode. MDATA_BRIDGE_ISO seems to be related to SDS isoparms in the viewport, you can probably ignore it.

// Only use case of MDATA_BRIDGE_ISO in our code base, very likely a dormant parameter.
Bool BridgeTool::MouseInput(...)
{
  // ...
  if (bd->GetEditState()& DISPLAYEDITSTATE::SDS)
    data.SetBool(MDATA_BRIDGE_ISO, true);
  else
    data.SetBool(MDATA_BRIDGE_ISO, false);
  // ...

When bridging in edge mode, you likely will have to operate with half-edge indices, as for example described under GetEdgeS. I would personally either go for point or polygon mode bridging, as edges are a virtual construct which can be a pain in the *** to deal with in code.

Cheers,
Ferdinand