Thank you!

Hello! I'm trying to call IntersectSegments(). This function requires #include <geometryutils.h>, but my compiler says there is no such library.
Here is SDK page.
https://developers.maxon.net/docs/Cinema4DCPPSDK/html/classmaxon_1_1_geometry_utils_interface.html
How to call this function? And why i don't have this library despite the sdk page.

Hello!
I'm trying to change a vertex (point) of a cube and instead getting this error: "Modeling Kernel Error:Invalid Object".
Here is code. I'm using R20 version.

BaseObject* const cube = BaseObject::Alloc(Ocube);
cube->SetName("Default"_s);

doc->StartUndo();
doc->InsertObject(cube, nullptr, nullptr);
doc->AddUndo(UNDOTYPE::NEWOBJ, cube);
doc->EndUndo();

ModelingCommandData mcd;
BaseContainer bc;
mcd.doc = doc;
mcd.op = cube;
mcd.mode = MODELINGCOMMANDMODE::ALL;
mcd.flags = MODELINGCOMMANDFLAGS::CREATEUNDO;
mcd.bc = &bc;

if (!SendModelingCommand(MCOMMAND_MAKEEDITABLE, mcd)) ApplicationOutput("Couldn't make object editable.");
PolygonObject* pol = static_cast<PolygonObject*>(mcd.result->GetIndex(0));

if (pol->GetType() != Opolygon) {
	ApplicationOutput("not polygon");
}

AutoAlloc<Modeling> mod;
if (!mod || !mod->InitObject(ToPoly(pol), 0)) {
	ApplicationOutput("modeling alloc failed"); return 0;
}

pol->ResizeObject(4, 1);
pol->SetName("POLY"_s);
mod->SetPoint(pol, 3, Vector(-1, 0, 0));

if(mod) mod->Commit(pol);

EventAdd();

Cube is created, resized, name is changed to "POLY" but zero changes from mod, there is error in console instead.
I'm new to plugin development and don't know how to properly use API for such purposes.