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UE5: Interactive Materials in Blueprint // Unreal Engine Tutorial
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- เผยแพร่เมื่อ 12 ส.ค. 2024
- Support on Patreon: / techartaid
Streaming weekly at / techartaid
Learn how to control materials in Blueprint. Animate properties by sending data from gameplay. Optimize performance by avoiding draw calls. Set scalar and vector parameters on hundreds of meshes efficiently, without dynamic material instances.
00:00 Introduction
01:30 Material parameters & instances
04:05 Dynamic material instance in Blueprint
05:25 Performance issue: Draw calls from dynamic instances
07:38 Optimization: Custom primitive data
10:02 Set mesh color (custom primitive data) in Blueprint
14:36 How to fix default black in custom primitive data
18:06 Controlling an array of meshes together
20:17 Use 0-1 value range for convenience
21:09 Controlling emissive material
22:59 Animating rotation
24:10 Global color switch: Material Parameter Collection
26:39 Using global parameters in materials
27:48 Final words
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Hello again ;]
Welcome back! We missed you.
HELOOOOOOO
Jak zawsze świetne wideo, szkoda że nie postujesz częściej
How does lumen change the order of operations presented in this video?
Lumen is perfectly compatible, fortunately! See my new video about Lumen. It's the same map. I'm wondering about Nanite though - how does it handle custom primitive data. I'd have to test.
This is a fantastic exercise and video
Sometimes you get so caught up in technical things, fighting the lack of educational materials or fighting through too much at times, sometimes learning things can be so daunting and exhausting
And then every once in awhile there's a tutorial that captures the simplicity, magic and imagination of a world that drew us in as kids, and reminds us we can JUST HAVE FUN and enjoy the process sometimes
Great vid
I'm a simple person, I see Technical Art I press like.
And btw, great topic Custom Primitive Data, a very little used feature that is actually very powerful.
I thought so too! We used it extensively in Cyberpunk 2077. Vehicle damage, glass bullethole positions, wetness.
Super cool 😎 I discovered your channel just like half a year ago and thought already this is more of a passive lookup channel for me, rather than an active video source. So cool you decided to upload a video again!
Man, I think you just saved my day! Been digging around the internet for hours searching for such a way to animate materials. Thanks!
The Custom Primitive Data optimization was brilliant! I had no idea about that optimization. Thank you so much!
Cool. Thanks. You can wrap the parameter setting code in a function and call it in Construction Script. Then the colors will be visible in the Editor.
Nice to see you again!
Custom Primitive Data - mind blown... thanks so much for this
it's great to see you back, your tutorials are very complete and useful
The Custom Primitive data stuff is awesome! thanks for the tutorial :3
hey, it has been a while !
good to see u again dude .
This is how you make a tutorial.
Thankyou for the video! I learned alot. Also this efffect looks amazing, reminds me of classic 3d platformers back in the day.
I my GOD!!!! You are BACKKKK YYAYAYYYYAYYYYYYYY!!!!!!
Wow, incredible video, thank you!
At 02:39 you said we definitely need a MID (Material Instance Dynamic), because the regular editor-based MIC (Material Instance Constant) cannot be changed at runtime, during gameplay, because it becomes "cooked". The official UE documentation says the exact same thing. However, on my latest video you'll see that I am able to control everything, at runtime, for each individual material, without using any instancing at all, no matter if it's MIC or MID. And yes, I even tried it on a fully exported game with "Shipping" settings and "By the Book" cooking and it still works! I'm actually using the exact node you said not to use at 25:58. I know you were already explaining something completely different there, but just as a reference. So, I fully understood the CPD and MPC roles and that whole separate discussion, but my biggest issue is trying to understand why am I able to control things at runtime, in a cooked game, by using the base (parent) material itself directly, without any Dynamic instancing at all, even without regular (Constant) instancing? Thanks so much for your videos, btw!!!
Interesting! Thanks for sharing. What happens if this material is multiple times throughout the level? Are all its instances being changed at once?
@@TechArtAid Nope, all are being changed individually, like shown in my video (I'm using 2x objects there to demonstrate this and you can see their parameters being controlled differently in real-time). Also, nobody on the UE forums seems to have any idea (the link is in my vid's description), despite veteran members confirming that it works like that since the early days of UE4. This makes me question everything, since I cannot understand why the creators of UE would make this entire system of nodes for creating MIDs, if they actually were never needed at all in the first place. It completely invalidates their documentation.
Check the number of draw calls please. It should increase, indicating a creation of a MID under the hood. One idea that comes to my mind is that MIDs can be passed (and stored) as a reference. That makes them reusable if you need to, configurable later etc.
@@TechArtAid So, after many tests, I can clearly state that my draw calls are *exactly the same* using 3x methods (changing the material directly vs. doing it through the use of an MID vs. not changing anything and just having a simple, static material from the Engine Content), which further makes zero sense since I was hoping this would be the hidden reason for why MIDs would be better, but apparently it still fails to add no value at all. Not only that, but when using MIDs, if I have multiple Static Meshes inside the same BP, all of them are now in-sync with respect to their parameter changes because although I'm still giving separate data to each of them, they're all using the same MID, therefore they all take the combined changes at once, meaning I cannot independently change them at will the way I'm able to when *not* using MIDs. This clearly shows me that when I'm not using MIDs, somehow UE is able to understand that I wish to have separate behavior for each Static Mesh and manages to somehow keep that separation behind the scenes, while creating an MID by myself will clearly use *that* MID only for all Static Meshes, since that's what I'm telling it to do. I'm really not satisfied with this result, as I'm sure there must be something I'm missing... 🤔
If you're using Discord, you can bring the discussion (and files?) to my server. Find the link in my Twitter bio (@ TechArtAid). Maybe someone will have an idea
nice coming back
Amazing really help my problem thanks !!! :)
Great tutorial as always
Super cool video, thanks a lot!
I didn't even know about the custom primitive data thing. Really handy optimization now that Geo Scripting is in beta!
Right, great for the PCG plugin too! (per-instance data, but the concept stays the same)
Thanks for the great tutorials. I was wondering, how do you measure such blueprints performance (as compared to a C++ approach)? On a related note, is there an equivalent C++ interface for working with custom primitive data and creating dynamic materials?
There is, yes. For measuring, Unreal Insights + see my UE4 graphics profiling videos
Edit: ah, you've seen them :3
This is cool. I was looking for a way to animate Materials of spawned pickups, without using Level sequencer, so I could put the animation in the BP, because I'd need to set Touch events for each pickup (thus I didnt want to reference exact actors in Level sequencer).
Ultimately I didnt animate a Material (like fade in and out). But I setup my Master material to have 2 parameters: glow color and opacity, which change.
So when the Player touches the pickup (fuel), if he is full (at 100), then I dont want to do the normal destroy actor event, to keep the pickup on the map for later.
So I set 4 variables. Original opacity = 1. Changed opacity = 0.5. Original color and changed color.
So when the player touches, if he's full, I use a branch, and the material on the pickup turns to 0.5 transparent and changes red, as tho the pickup is on time out (using his set Custom Primitive Data - Float = Opacity). Then after that I have a delay =1. Then I again set the Custom .. Data back to opacity 1 and original green color. And this transition seems to look good. And the player knows he can come back, touch it again to refuel (if he needs to).
Wait I finished the vid now. If I want to animate, how do I get your example files?
This tutorial is the only one that's not contained in the "Assets from YT tutorials" package. That's because I made it for the "Math Essentials" originally. If you want to buy Math anyway, get the variant with project files on techartaid.com/products But better reach me on Discord and I'll send you the scene - discord.gg/qhPdwV453B
HE'S BACC
Question: May I ask how I can use a material MATH node to offset a UV across an Atlas? Ultimately, I would like to use a Control Rig controller (set to integer) that would offset the UV across the atlas one UV tile at a time? When the Controller is moved along the X axis, the controller will be at an integer value of 0, 1, 2, 3,...24. The controller’s integer value would offset the UV one UV tile at a time across the texture atlas coordinates set in the material, the UV would pop across the atlas not slide across the atlas. Linking the UV position in an atlas to a Control Rig controller is on my mind. Thank you for this video, it is brilliant.
Yes, that's a real use case indeed! Use the SubUV node to shift a frame along an atlas. Or if you want to do it manually, for some reason, then multiply the coordinates by X frame count (integer, e.g. 24), floor or round it, then divide back (by 24).
Search for "convert 1d coordinates to 2d" to learn the math for getting the Y row index (X2,Y1 from 27 in your example). It involved modulo aka fmod
15:30 Can't you use bool parameters? Or do they not work with custom primitive data? That would make sense if it's an array of 32 floats where the padding would be in push constants.
Thanks for pointing that out. Actually I forgot that UE has bool params :o At work, in our custom engine, I used to pack 32 booleans as bits into a single integer, then reinterpret_cast() it to float before sending to custom primitive data. HLSL has a similar function that changes float type to int type bit-wise (and vice versa)
@@TechArtAid That's clever, reinterpreting a bitfield as a float to use it as primitive data. I'll probably use that now if you don't mind :D
Request: can you please do a video on promoting an integer variable from a controller or bone? And plug the variable into two parameters in a material: U offsets and V Offsets? If a bone or controller translates along an X axis it outputs an integer variable. That integer variable will translate the U offset and V offset in a material texture atlas? I cannot seem to figure this out, may I ask for your help?
Can you do this with textures rather than just basic colours? Say I have diffuse, roughness, metallic and normal, I'd like to be able to interactively change each one to another texture. Great work btw, this is extremely relevant to my current project :)
Thx! It's possible to some extent, though in a non-optimal way (performance wise). Normally in GPU APIs like DX, OpenGL, you can't just "rewire" a texture dynamically without creating a new material instance (draw call). In theory, bindless resources allow that, but UE doesn't expose that to you. To work around it in UE, I'd create multiple texture parameters, then "choose" the one to be used. The choice can be implemented by multiplying unused textures' RGB outputs by 0, then adding all of them together. A vector parameter (custom prim data) then needs to be set like 1,0,0,0 if you want 1st texture, 0,1,0,0 if you need the 2nd one etc.
@@TechArtAid This is great advice thank you! My project kind of depends on many individual materials to be interactive which means I need to be saving resources wherever possible really. I'll experiment with what you mentioned :)
Does it works with texture sample or just for only store Vector and Scalar values?
I want to create several different meshes with different textures for the same character and somehow swap or blend between them dynamically depending on nearby meshes in the character's surroundings, like a chameleon. How would I do this?
The answer demands at least a video ;] Let me add this to #next-stream-ideas discord.gg/jC9eHyUTBm
Hi, great video,
Can we have the source files of this scene? Thanks
Hello there, awesome tutorial. To keep draw calls in check this is great, but what would be the difference of this and calling "Set (..) parameter value on materials" directly on the static mesh? I've tested here and no extra draw call were displayed on avarage or max. And again, great tutorial!
Glad you enjoyed it! Do you reuse materials on other meshes? I don't know this method, but I guess it does one of the two:
1) change the value in the material instance, therefore changing it on every surface it's used on
2) create a dynamic material instance on the fly, increasing draw count +1 in case of a reuse
Hey! when we use the set scalar parameter value on materials function, how do we tell it to change only the material element 2 for example? say I wanted to change roughness scalar value, but only of the windows, not the walls, how do i tell it to use material id 2 ? (because all my materials has the same name "roughness" for its roughness channel, and ideally i would like to keep it that way:DDD )
Tell me if I understood correctly:
1. you want to pass parameters to a material function you made (e.g. ApplyDirtAndLeaks) in multiple materials
2. you have windows and walls in the same mesh
3. windows and walls have to use the same material slot?
3a. if no, then it's easy - right click on the material and make a Material Instance (read or watch about them, as they're nicely documented)
3b. if yes, you'll need to have some material ID mask. then run the function twice, with different parameters (passed through a FunctionInput node in the function). then mix the results using a Lerp node
@@TechArtAid Thanks for the reply! I think i kinda get what you mean, and its similar: I have windows and walls in the same mesh, with different material slots, slot 1 wall, slot 2 window.
and in the blueprint, i want to change the roughness of window's material instance(which has a scalar called roughness)
using "set scalar parameter value on materials" for the wall+window mesh, it changes roughness of the wall as well, since the wall material instance has also scalar named roughness :D
so easy answer is: just rename the scalar parameter in one of them.
But I was wondering whether you know of an alternate method without using dynamic instance materials. Because as far as I understand that costs extra in performance?
when i use this to change Custom primitive data as an editor tool.. it seems to change it, but the values remain the same when i select teh object... visually its different. How do i save the numberic values into the actor at the bottom right in the details tab? Im using CPD to reduce draw calls so basically almost everything in my level has custom primitive data on it. Also is their a benifit to using material parameter collections over simply just applying the settings per static mesh actor?
In Details, there's a Custom Primitive Data Default, or something like that
@@TechArtAid thx that worked
Is there a way to use Custom Primitive Data for actual textures or something along those lines?
Like if I have 20 instances of the same object but wanna give them different textures (not just single colors), can I do that?
Yes, via shifting the coordinates on a UDIM (just add offset to UVs). See this vid: th-cam.com/video/-oFY5QWXKZY/w-d-xo.html
@@TechArtAid Okay, ngl, that's pretty amazing. It might not help my cause since I'm not the one making the models and they'd have to rename them probably, but that's super sick, I'll experiment with that.
Thank you :D
Good luck :) udims are fun to explore
:)
Does this work with multiplayer?
Hm I don't know if Custom Prim Data can be replicated automatically. But it should be very straightforward to sync it, through a variable that's replicated
That's Unreal Engine 4, not 5, I wish I could fix dynamic material after migrating to ue5
It works exactly the same in 5
By the way - in the "If" node in material, do NOT connect A==B unless you need it! Leave it empty, otherwise it produces more instructions. My bad :D
twitter.com/Deathreycg/status/1307984520294076416?s=19