Video

Actually no, it doesn't look like it. We'll get that added.

It’s not supported yet in MRG. It’s on the list but behind some other more pressing functionality.

@@shauncomly ok thankyou for reply🙏

Bloom does not show up in the alpha.

No. You can post on the forums and people will help you. Some Epic folks, myself included, go in there from time to time to answer questions. Or if you have UDN access that is a way to get directly to Epic support.

The only way to add a custom token is from c++. We are going add ways to do that in MRG shortly with string variables. But {camera_name} should be supported. I just tried {camera_name}.{frame_number} and it worked fine.

@@shauncomly Thank you! We managed to use python to override a custom user serialized_string variable to split camera_name into 4 parts (scene/shot/take/version) and use them as directories in the path (and the name). However we did notice that when getting the value of a user variable, it only ever returned the default value of it, never the value the user has overridden in the movie render queue-side. Overriding those values worked in python tho. So we got what we wanted. However I would have wanted to code in a "check if user has overridden a value, if so, use their value instead" into the python code.

@@LeoLiesvirta When did you override it (at edit time? Or through an Execute Script node at runtime?) What are you overriding, the Job's version of the variable, or the Graph's default value for that variable? Are you using the variable as a node plugged into another node or overriding a final property directly? Are you able to share a small repro?

@@shauncomly "on_shot_start" override then loop through the variables... "graph = job.get_graph_preset() #job is the "in_shot_copy" copy of the on_shot_start. variables = graph.get_variables(True) for variable in variables: member_name = variable.get_member_name() if member_name == "OverrideOutputDirectory":" ... to find our variable. And then we set the variable to overrider it. And to clarify this overriding works fine. However if we print the value of the variable it always returns the default value of it and not the value which the user set in the movie render queue window where all the user variables are exposed. Is there another point of the render process or perhaps another command to get the user-set value of the variables?

I wish I could post a pic here but I'll try and describe it. So that will show up as a "track". If you list your tracks in the master/main sequence you should see a "MovieSceneSubsctrion" track show up. Anyways "Get_Tracks" on your main level sequence then loop through that array and "Get Sections". Now loop through your sections array and "CastToMovieSceneSubsection". This will filter out your subscenes. For the return of "AsMovieSceenSubSection" connect a "GetSequence" node and plug that return value into a"GetBindings". That should return you an array of your bindings in your subscene track.

In hindisght it would have probably have been easier to just post some python.

@@shauncomly Wonderful, thank you! Finally got the array of the subsequences. I dont think I could have figured this out on my own.. xD However now I am trying to return just the one that is currently being rendered. I suppose I should do something similar as in the tutorial 17:30 point where you get the keys to compare if the frame is the same as the current played/rendered frame. However not sure how to pull out the current "key" of the sub sequence being played.. x/ Please halp!

@@LeoLiesvirta Is the problem that the subsequence is offset from the main sequence so the frame number in the subsequence does not match the main? If so you can get the section range start frame and just offset the render frame.

@@shauncomly Ah, right! And I just compare the current frame of the mastersequence to the offset-subsequence frames to see which one is being rendered. I can probably assume that the array is in chronological order based on how they are ordered in the master sequence so I can use an integer to keep track of the ones that have been "played" already and just add the offsets that way. That what you meant?

Yes. There are likely a couple things at play here. The MRQ path employs the GPU OCIO path, unlike MRG which is all done CPU-side now. Our OCIO shader clamps negative colors (this could be argued to be undesirable but it does currently). This clamping is not present with MRG/CPU OCIO. I believe part of the difference here could therefore be explained by this gamut expansion + clamping happening just before OCIO. You can try and disable Expand Gamut and Blue Correction in the PPV or use the VPPassThroughPostProcessVolume (in VPUtilities plugin) which has all the required settings disabled by default (including local exposure).

Also note, we just submitted a fix to allow negative values through the OCIO shader @ CL 34647810 in UE5 main.

@@shauncomly Hi Shaun, disabling the Expand Gamut and the Blue Correction in the PPV did the trick and I now have an identical image in Unreal and Nuke's viewports (OCIO sRGB Display SDR) when I render using MR Graph .Thanks for the help, problem solved! :) For the record, I just tested rendering with the Movie Render Graph with a build of UE5 Main and it seems to work without having to turn off the Expand Gamut and Blue correction (similar to the way MRQ works when using OCIO). My build dates from July 25th so I'm not certain the fix you mention was already in there as I'm not really sure how to find a CL #.

@@mathieulanglois3259 Yeah you probably got the fix then.

Check that all the components on the UDS actually have a holdout parm. I have not gone through the UDS and checked it. You may have to go mess with the individual components to get it working.

I go over it in the video. Enable Visible in Indirect While Hidden and make sure you don't have Screen Traces on.

update for anyone else wondering I managed to get it going by manually ticking visibility boxes within the components and separating out different MRQ/levels for FG,MG,BG

@@ToastNz Hey! Sorry, I was away for a bit. Yes, this is the only way atm.

It's not supported yet, unfortunately. How much do you use them? Does the lack of post-effects support make them less effective?

There is a set console variable node

@@shauncomly ok thanks🙏🥰

Component tags are the only way. It should work. If its a spawnable make sure you add it to the asset. When it respawns it wipes the tags from components unless you save it to the asset. We are working on better support for spawnabes in 5.5.

YOu can get to some of the buffers under the viewmode index on the renderer node or use the lighting components under the show flags. Otherwise, you would make a PPMaterial and grab the buffer like normal. We are going to add the path tracer lighting components in the PPV to the pathtracer node in 5.5

Yes

It's supposed to be, lol. Let me see if I can see why it's not updated.

No, it would work with anything that has active transforms. You would just have to change the BP to be able to get at the component you want.

Yeah, we tested this and it worked. Can you post on the forums and include an example image?

You can render out the viewmode index. But honestly in the deferred render path those passes are not going to give you something where you can build your frame back like you can in VRay/Arnold. You might be able to get a little closer with Pathtracer.

@@shauncomly No no, myself and most likely others that need this are probably using path tracer. Thanks for the response. Cant wait to give this a try!

Niagra still has limited support but you would just hold everything else out.

Yes you can add the {layer_name} token to the output path.

thank you @@shauncomly will it give me layers in separate folders ?

@@EMNM66 yep

@@shauncomly hey, how do i get only the emissive pass in UE i dont see it anywhere.

@@EMNM66 There is no one-button solution. You would need to setup the pass by holding out everything else.

Nope not all. They are still working on getting everything in. That one is not in there yet.

@@shauncomly - Thanks for the info! Can't wait for the next set of updates. Keep the MRG videos coming!

Yes all that is supported with the new render attributes. You can just hold out the sky or make it visible in indirect illumination.

I have not tried that but you could theoretically do it. And there is no way to mute a track natively inside of the render graph. The graph doesn't really have that kind of a direct connection to Sequencer. You could disable things with a script though.

Not natively atm. In the future, it will probably be there with the Pathtracer. For the deferred renderer it's a little harder as that information is gone by the time MRQ gets it. They would have to make a custom buffer to hold shadows till the end. Which is not something they want to do. You can make the pass though by going old school and just putting a white material on everything. We did just request a receive shadows parm to make that easier.

thanks

I want to know how to render multi-channel in UE, such as how to render shadows

Not natively atm. In the future, it will probably be there with the Pathtracer. For the deferred renderer it's a little harder as that information is gone by the time MRQ gets it. They would have to make a custom buffer to hold shadows till the end. Which is not something they want to do. You can make the pass though by going old school and just putting a white material on everything. We did just request a receive shadows parm to make that easier.

@@shauncomly thanks Shaun. Great to know. It’s the most common request from comp especially when working with live action but yes it is achievable with a mix of pp and using the lighting passes already just about but it’s very messy I find. If there’s a possibility of it making it in in whatever form fantastic

@@tmaintv I'll pass the feedback along to the product team. It's a common request for us as well.

Yeah you have to re-initialize it which is annoying. We actually just came out with a plugin that makes all this so much easier. I considered taking these videos down but its not a bad thing to learn about enhanced inputs. Anyway this all makes working with a controller so much easier. dev.epicgames.com/community/learning/tutorials/xpV1/live-link-input-device-a-new-way-to-use-game-controllers-for-performance-capture-in-unreal-engine-5-4

Ahh yeah after thinking about it the UVs are gone by that stage. You would need to write an event to reassign the material to the RGB pass.

I see, is there any way you could explain how to go about writing that event or is it too complex to write over a youtube comment?

@@lolboy9501 Just get all actors in your scene and reassign the material. You can launch a custom event from a cvar in MRQ by "Ke * CustomEventName"

What specifically are you trying to do with the cinecamera? Control the lens or control the transforms? If you are trying to control the transforms I suggest you put your controls on an empty actor or something and patrent the cinecamera to it.

Just add it to your command line with another -i. "-i video1.mp4 -i audio1.mp3"

@@shauncomly the command line component inside movie render queue config? Do I also need to enable wav?

@@shauncomly I tried adding -i video1.mp4 -i audio1.wav in "Additional Command Line Args" in Command Line Encoder, log said there is no video called video1.mp4. I also replace video1.mp4 to {Videooutput} still failed. Is it the correct way to add the command line?

@@chah1653 You will not be able to add that as an additional command. It will be fixed in 5.4 but there was a bug that would not allow you to include more than one input using the command line encoder. You can get 5.4 off of Git and try and merge the code. Or you'll have to do it in a separate operation until we release it around March/April.

@@shauncomly Right now I indeed do a separate operation after rendering out wav and mp4 in ue. So there is no way directly make audio and video together inside ue... sequencer rendering is not an option, I use movie render queue

😅never mind like usual one little check box fixed my problem.

@@MrBrubobaggins I'm having the same issue, do you remember what the little check box was?

@@sergibro For me it was in the EUA_Spoof_Video BP the second node that is used to set Receive Editor Input was checked off when I updated. You will see it for a second at 3:14 good luck!

You want P4V

Check out VP Roles. You can set them in Switchboard or manually in the UE. Then set the role you want to the vcam HUD to display to on the VCam actor at the top. dev.epicgames.com/community/learning/courses/lPA/unreal-engine-virtual-production-visualization-guide-chapter-1-fundamentals/mM17/unreal-engine-virtual-camera docs.unrealengine.com/5.3/en-US/virtual-camera-multi-user-quick-start-guide-in-unreal-engine/#:~:text=VCam)%20Actor%5B%E2%80%A6%5Dtchboard%20application

You can constrain an empty actor or something to a bone or a socket and they derive the transforms from there. czcams.com/video/33b1IFBhEBw/video.html

thanks! Constraints are great. I believe this only works inside of sequencer. I was trying to set it up where it works in game, during a live link performance capture session. In the blueprint you made, you make a soft object reference as the target, I was wondering if that target could be a bone or a constraint? That's what has the transforms in my case. With this method, I think setting up a level sequence in the blueprint, where the sequence has the follow actor constrained to a bone on the live-link skeleton, maybe that would work? all the best @@shauncomly

@@Pikameleonconstraints work outside of sequencer. They work in editor as well. I did a quick test and it should work for you.

@@shauncomly wow I didn’t realize that! That worked!! I followed this tutorial as well as your 4UP tutorial and I just want to say thanks because this was exactly what I was looking for!

@@Pikameleon Awesome! Glad we can help. If you haven't already check out the Vis Guide on Epic DevHub. Now that UE Fest is done we are working on the next installment. We'll periodically post things there that we think are helpful to people working with performance capture and vcam in Unreal Engine. dev.epicgames.com/community/learning/paths/XRe/unreal-engine-virtual-production-visualization-guide

Hit me up on LinkedIn or something. I can connect you with someone at Epic who supports stages.