rendering motion vector as color plane

[misterbil]

Hello,

Sorry if this has been covered in an older post (if so, can someone point it to me).

 

I'm rendering a few extra image plane (C, A, z-depth, motion vector ) but I would like to export them all as separate image sequences.

Have one sequence of image with RGBA

one sequence with the motion vecot as RGB

 

is there a mask channel node? convert channel? convert image plane?

I tried using the channelcopy cop with the target as the rgb and the source as the motion vector, with no result.

 

I can't unfortunatly post the scene file.

I'll try to repro it at home and post something later.

 

any info would be appreciate.

 

bil

[mestela]

On the motion vector image plane, enabled the 'different file' toggle, and give it a path.

 

 

[misterbil]

Hi Matt,

thanks for your reply and sorry if I sound dumb, but which node are you refering to?

the file node in COP?

The mantra node in the output?

I also looked in the documentation and all I could find was in the mantra node documentation ... unfortunatly, when you open houdini and put down a mantra node that check box don't exist ... or at least I coulden't find it.

 

But that would not help me anyway. I export my images from Maya (via mental ray). 

 

here is what I have:

in my COP context I added a file cop and a copychannel. but the only thing I can see as a result is the C (rgb) plane.

it works with other plane

 

 

what I see before AND after,

 

what I should see, even when I select C after the ChannelCopy cop...

 

 

any idea?

 

Is it a naming issue? my channel's name seems to have column (" : ") (trying NOT to make a emoticon here)

 

thanks

[mestela]

Ahh, it's a bit of black magic. The toggle only appears once you type in an image name for the main render; if you leave it as 'ip', the option is hidden. Easier to see in this animated gif (click to play):

 

 

 

Still doesn't answer your COP question though, sorry!

Edited March 25, 2015 by mestela

[misterbil]

wow! that is voodoo magic! I would have been less surprised if you have told me to sacrifice a goat or run around the office naked covered in peanut butter !!

 

But thanks a lot for your reply, it's greatly appreciate!

I'll continue to investigate and see if I can figure it out, otherwise I'll see if I can import the animation and try to render the velocity information to the RGB channel.

[mestela]

Hmm, works for me in contrived simple example, attached.

 

I don't use cops at all, could it be that cops is having troubles reading your exr's? Could you maybe upload a frame for us to play with?

 

copnet_channelcopy.hipnc

 

 

 

 

[misterbil]

Hi Matt,

 

thanks a lot for that.

I uploaded one image here:

https://drive.google.com/folderview?id=0B1JToqdc2kstfmlZZFNEd3NNUmpPb1ZUc0ZHYzNJMnVNNTYzMEdFWjd4TmpRcHRzZXBrUGc&usp=sharing

 

let me know if that works.

 

cheers

[mestela]

Had a look, seems cops doesn't like that image. I suspect its the channel names, they look a little messed up. Djv also has problems loading the motion layer. Nuke loaded it ok.

 

In nuke I renamed the layers to mv (as 3 channels, so mv,r, mv.g, mv.b ) , and depth (as depth.z), and wrote out a clean exr. That loads into cops fine.

 

Attached it if you wanna take a look.

 

cop_clean.zip

Edited March 29, 2015 by mestela

[misterbil]

Thanks Matt!

I'll go back in maya and figure out how to rename this.

 

Maybe there is a way to rename it in cop?

 

anyway thanks a lot for doing this!