adding layers to the render buffer

On 20/08/2015 at 13:06, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   15+ 
Platform:   Windows  ;   
Language(s) :     C++  ;

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this question may be related to an old thread, https://plugincafe.maxon.net/topic/8414/10991_q-about-renderdocument-custom-renderer-solved

where Joey said:
"the bitmap passed as "image->pDest" to RenderDocument() becomes the internal render bitmap of type MultipassBitmap.  When you call "vps->render->GetBuffer(VPBUFFER_RGBA, NOTOK)", you get the renderer's MultipassBitmap pointer.  As stated in the documentation, a VPBuffer is represents the same class internally as a MultipassBitmap, so a VPBuffer can be cast to the latter, and vice versa.  Therefore, you should be able to fill the bitmap to view the results in the material preview window."

so what I try to do is adding a new layer to the VPBuffer* when rendering, it may be illegal the way I do, so may be some advice..
a code snippet:

  
                //header
        	VPBuffer* m_rgba;
        	MultipassBitmap* m_test_;  
  
                //cpp
		m_rgba = vps->render->GetBuffer(VPBUFFER_RGBA, NOTOK);
		MultipassBitmap *rgba = (MultipassBitmap* )m_rgba;
		m_test_ = rgba->AddLayer(rgba, COLORMODE_ARGBf);

  
        //writing  
	for (int yy = y; yy < y + h; ++yy)
	{			
		m_rgba->SetLine(x, (y2 - y1) - yy, w, &pData[(yy - y) * w * 4], 32, true);
		VPBuffer* m_test = (VPBuffer* )m_test_;
		m_test->SetLine(x, (y2 - y1) - yy, w, &pData[(yy - y) * w * 4], 32, true);
	}

this crashes, didn't check where it crashes "at creation of m_test_ or at writing, whatever it fails", so what should I do?

On 21/08/2015 at 02:03, xxxxxxxx wrote:

Hello,

you can create custom render buffers using AllocateBuffers() using Render::AllocateBuffer(). You find an example on how to create standard buffers in the Colorize example.

You can also create a custom post effect buffer using Render::AllocateBufferFX(). Then you can access this buffer later with Render::GetBuffer(). Please note that you must enable "Multi-Pass" and add the "Post Effects" pass to enable custom post effect buffers.

Best wishes,
Sebastian

On 21/08/2015 at 07:21, xxxxxxxx wrote:

Hi Sebastian,
thanks a lot for the help, it works to some extent, but there are problems "which I don't know why they happen., I searched and found most examples of AllocateBufferFX() did the same as I did"

I activated mutlipass, post effects.
problems:
1- weird image...
2- layers don't appear

inside AllocateBuffers()

  
	Int32 needbitdepth = 32;	//8, also 16 and 32 are possible
	m_test = render->AllocateBufferFX(VPBUFFER_POSTEFFECT, String("atestbuffer"), needbitdepth, TRUE);

inside (vps->vp==VIDEOPOSTCALL_INNER && vps->open)

  
        m_test_ = vps->render->GetBuffer(VPBUFFER_POSTEFFECT, m_test);  

filling buffers

  
	for (int yy = y; yy < y + h; ++yy)
	{			
		m_rgba->SetLine(x, (y2 - y1) - yy, w, &pData[(yy - y) * w * 4], 32, TRUE);
		m_test_->SetLine(x, yy, w, &pData[(yy - y) * w * 4], 32, TRUE);//did it upside down to check
	}