Hi,

I wondered if it is possible to output integers for point data using extra image planes. I have posted a sample file where I have attempted to do this. I want a channel in my exr that has an integer per object. I was able to get RGB data thanks to help I received in another thread from Huey Yeng https://www.sidefx.com/forum/topic/55257/?page=1#post-247767 [www.sidefx.com]

I'm trying to build on that. Also, it seems I can only output data for meshes, not heightfields. I have to convert heightfields to polygon for the channels to output.

Thanks,

Adnan

If you're looking for a way to output integer per object, the Op_Id image plane already does that for you. Although I got no idea on how to assign it with specific integer number as the assigned number are random.

I'm assume you already know how to deal with that pass in a compositing software.

Look into to cryptomatte, it encodes integer or string data into special image planes that can be extracted later.

Thanks for the replies Huey and Jsmack. I need to specify numbers for each object, otherwise Op_Id would be a good option. Cryptomatte seems to be the way to go, so I looked into that, but I was unable to extract the data using OpenEXR Python bindings. I just get zeros, whether I choose string or integer. I also tried the first method, adding attribute nodes with integers and the required nodes in the shader, but I still can't get the same numbers out. EXR is saving the data as float16, but I can see no way that it corresponds to what I set for each object, which were integers 0-2.

Any ideas? I'm just trying to encode mattes for objects with integer values.

Thanks,

Adnan