My VideoPost Plugin can't be inserted

On 28/06/2015 at 08:29, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   R15 
Platform:   Windows  ; Mac  ;  
Language(s) :     C++  ;

Hello SDK Support Team!
I've run into a little big problem and I can't find out what could be the cause and I also wasn't able
to revert to a situation where this problem does not occur.

The VideoPostData  plugin I created can not be added the the RenderData. You can see it in the
drop-down menu when you press the "Effect..." button, but selecting it from the list does not
insert it.

I've added a print statement to my LensVideoPost::Alloc() static function to check when the
function is called. The observations I made certainly confuse me.

  1. Pressing the "Effect..." button calls LensVideoPost::Alloc(). But the object is destroyed immediately
    afterwards (I assume the "Effect..." button builds the menu by allocating an instance of each plugin,
    getting its name and then freeing it again)
  2. After the Video Post is selected, nothing happens. Alloc() is not even called!
  3. Trying to create one from Python fails instantly, Alloc() is not called!
  4. Opening a scene that already had this Video Post inserted works! However, when you remove the
    Video Post and try to add it again, its the same behaviour as I already described.
  5. Cloning the Video Post from the scene that was loaded works as well.

I would like to send you the plugin for Windows or Mac (both same behaviour) and a scene that
contains the plugin so you can also check out observation #4. Please let me know if you need it
and where to send it.

Thanks a lot in advance!

On 30/06/2015 at 02:37, xxxxxxxx wrote:


without any code it is hard to say anything. Please provide some snippets of the most relevant parts of your code (Register() etc.).

Best wishes,

On 30/06/2015 at 04:27, xxxxxxxx wrote:

Hi Sebastian,

sure. Here's the register, alloc, init and free functions:

/// ---------------------------------------------------------------------------
/// ---------------------------------------------------------------------------
class LensVideoPost: public VideoPostData
  // ...
  static NodeData* Alloc() { GePrint(">>> LensVideoPost::Alloc()"); return NewObjClear(LensVideoPost); }
  // ...
/// ---------------------------------------------------------------------------
/// ---------------------------------------------------------------------------
Bool RegisterLensVideoPost()
  const String name = GeLoadString(PROJLENS_PLUGINID);
  return RegisterVideoPostPlugin(
    PROJLENS_PLUGINID,    // Plugin ID
    name,                 // Name
    0,                    // Info Flags
    LensVideoPost::Alloc, // Allocator
    "vpprojlens",         // Description
    0,                    // Disklevel
    0,                    // Priority
    nullptr);             // Unused, always nullptr
/// ---------------------------------------------------------------------------
/// ---------------------------------------------------------------------------
Bool LensVideoPost::Init(GeListNode* node)
  GePrint(">>> LensVideoPost::Init() #1");
  if (!node || !super::Init(node)) return false;
  BaseContainer* bc = Get(node)->GetDataInstance();
  GePrint(">>> LensVideoPost::Init() #2");
  if (!bc) return false;
  GePrint(">>> LensVideoPost::Init() #3");
  bc->SetFloat(PROJLENS_EQUI_HFOV, Rad(180.0));
  bc->SetFloat(PROJLENS_EQUI_VFOV, Rad(90.0));
  bc->SetFloat(PROJLENS_FISH_FOV,  Rad(180.0));
  bc->SetBool(PROJLENS_FISH_OVERLAY, false);
  return true;
/// ---------------------------------------------------------------------------
/// ---------------------------------------------------------------------------
void LensVideoPost::Free(GeListNode* node)
  GePrint(">>> LensVideoPost::Free()");


On 30/06/2015 at 08:49, xxxxxxxx wrote:

hey Niklas,
I'm not sure about the 2 early returns in your Init() function.
1- in my videopost plugin I don't call parent Init()
2- I get container like this "not sure about the Get(node)"

BaseVideoPost\* bvp  = (BaseVideoPost\* )node;
BaseContainer\* data = bvp->GetDataInstance();  

so maybe when you create the plugin it get stuck at Init()
but when you load a document with the plugin it doesn't call Init() at all "as it may be using read/write stuff to copy data directly without the need of using Init()"

On 30/06/2015 at 09:07, xxxxxxxx wrote:

hey Mohamend,
thanks for your comment. But Init() succeeds, so that's not the issue I think. The Get()  you see in
Init()  is overloaded and does basically the cast to  BaseVideoPost.

On 01/07/2015 at 01:47, xxxxxxxx wrote:


you code looks good so gar. But based on the class name I assume you are creating a custom lens? Maybe this causes the described behavior.

Best wishes,