I’m a bit confused about why the SiSt requires you to set the size of image. Shouldn’t it just get the image size of the input and double the appropriate axis? If the sizes are wrong it just fails to render, so I don’t know what the use case would be for having a different size.
The size input requirement was added so that single eye processing could be done. To speed up the preview I added the mode to output from the stack only the left or right image. If the unstack is unaware that only single frame processing is being done, then it will attempt to unstack the single frame. this leads to further problems down the pipe.
So it goes, if the input during unstack is the single frame size, then just pass the image though.
Also if the stack receives an image from only one of the inputs, but that input image is the single frame size, then just pass it though.
The usage is poorly documented… which is something I’m going to be working on soon.