Volume Object Example

d_schmidt

Hello! I was trying to get the Volume Object example working that's in the SDK here:
https://developers.maxon.net/docs/cpp/2023_2/page_manual_volumeobject.html

I'm having trouble having it successfully compile though.

The two headers I'm including:
#include "lib_volumeobject.h"
#include "lib_volumebuilder.h"

    BaseObject* object = static_cast<BaseObject*>(node->GetDown());
    
    // create VolumeObject
    // This example checks if the given object is a volume builder.
    // If so, it accesses the cache to get the VolumeObject.
   
    if (object == nullptr)
        return true;
    // check if VolumeBuilder
    if (object->IsInstanceOf(Ovolumebuilder) == false)
        return true;
   
    VolumeBuilder* const volumeBuilder = static_cast<VolumeBuilder*>(object);
   
    // get cache
    BaseObject* const cache = volumeBuilder->GetCache(nullptr);
    if (cache == nullptr)
        return true;
   
    // check for volume object
    if (cache->IsInstanceOf(Ovolume))
    {
      const VolumeObject* const volumeObject = static_cast<VolumeObject*>(cache);
   
      const maxon::VolumeInterface* volInterface =   volumeObject->GetVolume();
    
     const maxon::String  gridname2 = volInterface->GetGridName();
        //Error:: Member access into incomplete type 'const maxon::VolumeInterface'
     
        
        const maxon::Volume       volume = volumeObject->GetVolume();
     // Error::   No type named 'Volume' in namespace 'maxon'
        
        
      const maxon::String gridName = volume.GetGridName();
      DiagnosticOutput("Grid Name: @", gridName);
    }

I'm having problems with these two bits:

const maxon::VolumeInterface* volInterface =   volumeObject->GetVolume();

const maxon::String  gridname2 = volInterface->GetGridName();
//Error:: Member access into incomplete type 'const maxon::VolumeInterface'
         
            
const maxon::Volume       volume = volumeObject->GetVolume();
// Error::   No type named 'Volume' in namespace 'maxon'

Is there some sort of header that I need to include or is the example out of date?

Thanks for any help!

Dan

ferdinand

Hello @d_schmidt,

//Error:: Member access into incomplete type 'const maxon::VolumeInterface'

Means you are missing the interface declaration, you must include "maxon/volume.h" and be sure to have the volume.framework in your projectdefinition.txt. You can find the file documented here. This will fix the reference error for maxon::Volume, although the return type of VolumeObject::GetVolume is a bit odd, it returns a pointer to a VolumeInterface instance and not a reference, i.e., a maxon::Volume. I asked the responsible developer, and he told me it is for some optimization reason. However the type that you should use is really a maxon::Volume like so

#include "lib_volumeobject.h"
#include "lib_volumebuilder.h"
#include "maxon/volume.h"

BaseObject* object = doc->GetFirstObject();

VolumeBuilder* const volumeBuilder = static_cast<VolumeBuilder*>(object);

// get cache
BaseObject* const cache = volumeBuilder->GetCache(nullptr);
if (cache == nullptr)
	return false;

// check for volume object
if (cache->IsInstanceOf(Ovolume))
{
	const VolumeObject* const volumeObject = static_cast<VolumeObject*>(cache);
	const maxon::Volume       volume = volumeObject->GetVolume();
	const maxon::String       gridName = volume.GetGridName();
	DiagnosticOutput("Grid Name: @", gridName);
}

Cheers,
Ferdinand

d_schmidt

Hi Ferdinand,

Thanks for the reply!

When you said to add volume.framework, did you mean like this? I'm working from the SDK examples for this test.

// Supported platforms - can be [Win64;OSX]
Platform=Win64;OSX

// Type of project - can be [Lib;DLL;App]
Type=DLL

// API dependencies
APIS=\
asset.framework;\
cinema.framework;\
cinema_hybrid.framework;\
crypt.framework;\
core.framework;\
command.framework;\
image.framework;\
math.framework;\
mesh_misc.framework;\
volume.framework;\
python.framework;

// C4D component
C4D=true

stylecheck.level=0 // must be set after c4d=true
stylecheck.enum-registration=false
stylecheck.enum-class=false

// Custom ID
ModuleId=net.maxonexample.cinema4dsdk

It doesn't seem to me working for me here, with maxon/volume.h not being found. I've tried a few others things but none of them seem to be working. Do I need to add the framework somewhere else as well?

Thanks again,

Dan

m_adam

Hi @d_schmidt correct this is the file, did you regenerate the project with the project tool?
Each time you modify the projectdefinition.txt you should regenerate the project you describe in this file.

Cheers,
Maxime.

d_schmidt

Thanks! That worked for me!

Dan