[Openexr-devel] Writing channels seperately

[Brendan Bolles]

Is there a way to write a channel or two, load other channels in  
memory, and then write other channels?  It seems like all the  
channels have to be written in one sweep, while reading doesn't have  
this problem.

So currently the samples go like this:


    OutputFile file (fileName, header);
    FrameBuffer frameBuffer;

    frameBuffer.insert ("G", ...);
    frameBuffer.insert ("Z", ...);

    file.setFrameBuffer (frameBuffer);
    file.writePixels (height);


Is it possible to do something like this?:

    OutputFile file (fileName, header);

    {
      FrameBuffer frameBuffer;
      frameBuffer.insert ("G", ...);
      file.setFrameBuffer (frameBuffer);
      file.writePixels (height);
    }

    // load Z channel

    {
      FrameBuffer frameBuffer;
      frameBuffer.insert ("Z", ...);
      file.setFrameBuffer (frameBuffer);
      file.writePixels (height);
    }