Hello! The default behavior for the difference node is to do an union, so implicitly we have a union done. You can add a union node before if you want to be explicit. Note also that those videos are from me when I was less knowledgeable about the system, so there might be some places I did something not useful or optional!

I didn't create it, it already existed :)

Indeed things have changed!

There are some on the Unreal site. Otherwise it's a beta plugin, it comes with less documentation that's the contract.

Change the mesh in the mesh and ID struct by an actor reference, and change the static mesh spawner by a Spawn actor, with no merging option, and in actor attribute reference the name of your attribute containing the actor reference

@@adrienlogut3482 any idea how i could spawn it as a mesh and have it change to the bp when i interact with it? cheers love the channel

That's not PCG related then, you'll have to add another system that replace the instanced mesh by actors when the player is close.

@@adrienlogut3482 cheers! Your channel is brilliant

Yeah it's the first videos, learning it the hard way. You could always try to use a plugin to zoom on the video. Though watching it in 1440p, it's pretty sharp to my eyes.

Answered you on Discord too but for the other I'll post it there: If you add a priority value to mesh and Id, you'll just need to add that priority value as a weight attribute on the match and set attributes (like in the first video)

You can check other videos, such as episode 2, for bounds and exclusions

@@adrienlogut3482 cheers mate

@@adrienlogut3482 hey sorry for all the questions how do i filter slope for pcg?

Solved it... Just need to do another Loop...😅 and the Loop logic of PCG is very hard to understand... Lack of a clear cut direction to something like index and loop content as traditional programing language...

That's unfortunately a big limitation of a graph approach for programming. The best way to do what you want is to partition the data, so that all points in a given data has the same mesh. Then loop on those data. You can use Get Attribute from point index, index 0 because you know all points have the same mesh.

Yes of course, you can use another spline with the same sampling method and add that to the difference. Or another primitive and get it with Get Actor Data

​@@adrienlogut3482 Thank you for the advice! I somehow used a volume sampler to filter out that area!

That would work but it is very inefficient ;)

@@adrienlogut3482 Thanks for your great tutorials! How would you go about doing this? I am trying to use a difference node on two surfaces from spline before I send the surface into the recipe spawning loop, but the conversion returns a grayed out line. Debuging the difference looks correct, I have my original surface with a hole where the other surface is.

PCG doesn't support reading maps in the graph. Though if you want it to be in order from the array of meshes, you can use Copy Attributes. It will copy mesh 1 to point 1, mesh 2 to point 2 etc... Looping on the meshes.

We deprecated the input pins, so you'll have to use Get Landscape Data and Get Actor Data for the equivalent :) Have a look to more recent tutorials!

@@adrienlogut3482 great! ty for your quick answer :) I'll definitely follow your serie for PCG

i get the correct projection replaced "World Ray hit Query" with "Get Landscape Data“.

Living on the edge, no time to waste! Most of what is described here can be found in later videos, with the up to date way of doing it. You can check the Ep 1 and 2 about new features ;)

I'm a dev on the project ;)

You can use a transform points with absolute rotation, or if you use the projection node, disable project rotations

​@@adrienlogut3482It took me sometime to see that for both options it was a checkmark on the right panel of each node.. Thanks!

I answered at the beginning! I'm not that knowledgeable in HLODs so I can't help much :(

@@adrienlogut3482 ah, sorry. I must have missed it.

It's not much different than the point loop body: kzfaq.info/get/bejne/Y7CembRlr92qhH0.htmlsi=U_bUuGGgpgBautZ3 You have to query the data yourself though.

It has not changed between versions, if you need them to stay vertical, add a transform point with an absolute rotation of 0,0 on XY (and potentially any number for Z for random rotation)

@@adrienlogut3482 Thanks a lot

Useful tip: try to type what you want to do in the node list ;) You'll find the Projection node !

If you use the surface sampler you can play with the extents, looseness and points per squared meter

@@adrienlogut3482 Thanks. But I need an exact number of points. This number will be passed from the parent blueprint. Mesh Sampler allows that through Poisson sampling: you can set max points. Don't know why they didn't put that in Surface Sampler too.

Nothing prevents you to filter the points afterwards so you extract just a specific number of points. I have another video to select a exact number of points with a Blueprint node. And we implemented the native version of it, just that it didn't make the cut for 5.4. By essence the surface sampler is a stochastic sample, so that's why there is no fine control like that on the node. Also being a multi threaded node + the fact that you can have a complex bounding Shape makes it impractical to have a max number of points.

@@adrienlogut3482 Yeah, but what if I have thousands of PCG volumes in the level? Will there be performance issues to do all those calculations on each, just to get a specific number of points? Seems like an expensive work-around.

Indeed but that always depends on what you want to do and when it happens. If it's generating offline, it matters less than if it generates at runtime. You can also optimize it yourself to play with the points per squared meter depending on the size of the volume. But it's also not always a good idea to over optimize at the beginning, so try it out and see if the performance is good enough for you.

Sorry you have trouble understanding me, subtitles are available to assist you on that front. More details would be needed to understand which details would have been useful for you.

@@adrienlogut3482 I assume going over all nodes and properties in the detail panel would be too much. But, for example, would be very useful a tutorial on how to spawn stuff on certain regions of a mesh, in the case of mesh painting. I haven't seen a tutorial on that.

@@user-fm9zo5le2v So it's actually not the focus of this video ;) You might want to enable the PCG Geometry Script Interop Plugin and use the Mesh Sampler to sample points on a Mesh. It should extract the colors in the Color Attribute of your points (seems to only work on non-Nanite meshes for some reason). Then you can do some logic on that. If you are talking about Landscape painting, you can use Weighted Blend Layers to have multiple layers, and the sampling on the landscape should automatically add attributes for each layer, allowing you to do some filtering to spawn what you want.

@@adrienlogut3482 Thanks for that. But for some reason all Color attributes values are 1. What I'm trying to do is spawn points only on a certain region of the mesh, that I can define somehow. How would you go about doing that?

I'll answer it there ;)

@@adrienlogut3482 looking forward to it! I'm stumped. I tried line tracing down to the floor too..

You could extend the data asset with a weight for each mesh. Then you can provide this weight attribute in the match and set settings :)

@@adrienlogut3482 Thanks, I but I'm thinking more of a per-array weight as opposed to a per-mesh weight, but I don't see how/if the data could flow? Imagine if the mesh variable in the struct is an array instead of a single mesh.

The selection could be first a weighted selection for a type of mesh. Here that would be Tree, Rock and Grass. Then when the selection is done, you chain another match and set with the array of meshes for a given mesh.

@@adrienlogut3482 Oh interesting, thanks I will give that a shot!

No it's the same cost (perhaps a little costlier because of the attribute indirection) It's just the basics to create generic graphs. If you don't need to have generic stuff, you can stick with the hard-coded way.

@@adrienlogut3482 Thanks, you nailed the answer ✌️

Had the same problem but i notice in video its PCG Version 1 and we have Version 2 , that means you cant extend but on the right side you can find option to setup (small plus sign and drop down menu, choose Landscape) .. Thas all .. 😊

@@cmdrschime4840 oh i see. Thank you very múch!

We deprecated the default input pins. You have to use the "Get X Data Nodes" such as Get Landscape Data. You can have a look a later videos for an up to date UI/UX usage.

Haha yeah for that part unfortunately we can't override the collision preset for the mesh descriptor. You can add another boolean in the level definition for "Collision". Then before spawning, do a branch on the collision parameter, and have 2 static mesh spawner. One with collision and the other without

@@adrienlogut3482 I got it! Thank you very much!🥰

Happy to help! Looking at the code, you can't do it with Static Meshes, but you can with Spawn actor, look for `TagsToAddOnActors`.

@@adrienlogut3482 I hope they will expose this parameter on Meshes too :)

It's slightly more complex with Static Meshes because of Instanced Static Mesh Components are shared, all instances of the same mesh descriptor will be under the same component.

@@adrienlogut3482 you are right, I should have say "I hope they will expose it for the ISMCs :)" I find a solution using the Get Generated Graph Output.

Might want to have a look to the next video in the series ;)

@@adrienlogut3482 Thank you ! I got it !

You unfortunately can't use arrays as attributes, attributes are only base types. You can though create an attribute set with multiple entries. You can see that in this video I add an entry for the attribute set. If you want multiple values, you can add multiple entries!

Yes you can use it with the WP system. If you set the component to IsPartitioned it will dispatch the generation to a grid of actors. I have not yet made a video on that though, should come at some point with also hints on hierarchical generation and runtime generation

@@adrienlogut3482 I will try this

You can implement pretty much any logic either in BP or C++

Me too