Returns a handle to an on the fly created instance. If the owlClass input is zero or not a class handle 0 will be returned,


//   Visual Studio for Windows
__int64 __declspec(dllexport) __stdcall CreateInstanceEx(
            __int64             model,
            __int64             owlClass,
            const char          * name

//   Linux, OS-X and non-Visual Studio Windows solutions
int64_t CreateInstanceEx(
            int64_t             model,
            int64_t             owlClass,
            const char          * name

Property model

Size: 64 bit / 8 byte (value)
The handle to the model. The model handle is static during its existance. Several models can be opened simultaniously within one session. Different models are always independent, threads are allowed to be running on different models simultaniously.

Property owlClass

Size: 64 bit / 8 byte (value)
This attribute represents a handle to the class. The term owl is comming from W3C, the classes follow the expression power of Semantic Web concepts, therefore classes support multiple inheritance. Technically classes can also be distributed over different resources, however for this the parametric library is required as an extension on the basic Geometry Kernel API.

Property name

Size: 64 bit / 8 byte (reference)
This attribute represents the name of the instance (given as char array / ASCII). The name is given by the host and the attribute is not changed.


Here you can find code snippits that show how the API call CreateInstanceEx can be used.


int64_t model = CreateModel();

if (model) {
    //  The following setting makes sure all class handled are in an ordered list
    //  In certain cases where several models are open or in case of conversion
    //  between formats this can be handy and / or time efficient.
    int64_t classCnt = 0;
    OrderedHandles(model, &classCnt, nullptr, nullptr, 1, 1);

    //  Classes
    int64_t myClass = CreateClass(model, "MyCreatedClass");
    assert(myClass == classCnt + 1);

    //  Datatype Properties (attributes)
    int64_t propertyLength = GetPropertyByName(model, "length");

    //  Instances (creating)
    int64_t myInstance = CreateInstanceEx(model, myClass, nullptr);

    double  length = 2.;

    SetDatatypeProperty(myInstance, propertyLength, &length, 1);

    assert(GetVolume(myInstance, 0, 0) == 0.);

    char    * classNameI = nullptr;
    GetNameOfClassEx(model, myClass, &classNameI);

    SetNameOfClassEx(model, myClass, "OtherClassName");

    char    * classNameII = nullptr;
    GetNameOfClassEx(model, myClass, &classNameII);

    SetClassParentEx(model, myClass, GetClassByName(model, "Cube"), 1);

    assert(GetVolume(myInstance, 0, 0) == 8.);

    SetNameOfClassEx(model, myClass, "OutOfIdeasForClassName");

    char    * classNameIII = nullptr;
    GetNameOfClassEx(model, myClass, &classNameIII);

    //  The retrieved class names have the following values 
    //      classNameI   :  'MyCreatedClass'
    //      classNameII  :  'OtherClassName'
    //      classNameIII :  'OutOfIdeasForClassName'

    //  The resulting model can be viewed in 3D-Editor.exe
    SaveModel(model, "c:\\created\\myFile.bin");