vps->doc is changed on every Execute [SOLVED]

On 23/12/2016 at 07:12, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   R18 
Platform:   Windows  ;   
Language(s) :     C++  ;

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Hello.

When I try to render a scene in IRR (with my render engine), I use the document inside VideoPostStruct variable of Execute call. 
The problem is that the pointer of that document is changed in every Execute call. 
That means I cannot detect the object changes from one document to another since the object pointers change as well.

On the other hand, rendering in Picture Viewer N frames (IRR is disabled), I get the same pointer for 
vps->doc and it's easy for me to detect object changes from one document to another.

Is there anything I can do to be able to detect document changes in IRR between Execute calls, so I can pass the updated data in my render engine ?

Thank you very much for your time.

On 27/12/2016 at 08:51, xxxxxxxx wrote:

Hi Peterakos, thanks for writing us.

With reference to your question, the IRR uses a temporary copy of the currently active scene which, and as you reported it's unlikely to remain the same across multiple calls of the VideoPostData::Execute() method.
That said there's no single way to detect changes occurring between Execute calls and relying on the IRR automatism might result more complex than implementing a custom scene change queue and feed the renderer only with those changes occurred. In this case since you're not provided with a VolumeData representation you must access the caches of generators and deformers manually.

Best, Riccardo