WorldGen V1.2 — Hydraulic Erosion for Infinite Procedural Terrain (UE5)

Ajouté : 2026-05-06

[00:00:04]Hello everyone. So, >> [snorts] >> this is the newest update to my version infinite runtime terrain generation system. So, here we have I have introduced erosion hydraulic erosion to our terrain generation. So, this what you see here is with the hydraulic erosion. So, let me disable hydraulic erosion and show the result so you can see the difference.

[00:00:35]So, here Oh, here we have new set of parameters related to erosion. So, if you disable that and hit preview now we should see See, this is the uh our result without the erosion. So, it's so much smoother compared to previous version, but the with erosion it does look much realistic. Now, to compare, let me re-enable and preview.

[00:01:02]Yeah, here. Now, you see the terrain have a much more realistic look. So, if you're not familiar hydraulic erosion means in plain terms water droplets flow downhill and carve valleys and deposit sediment on flat areas. This is the same algorithm used in most of the triple A terrain tools as well. And even with this erosion layer we have still we have good performance.

[00:01:36]Let me show it in the real time. Let me speed up a little bit and fly around my level so that you can see.

[00:01:48]So, if I fly around in the real time realistic speed, you wouldn't see much of a difference. I mean, it's still generating, but it will take some time to reach the boundaries.

[00:02:00]But, if I Let me detach from the character.

[00:02:08]Where is it now? Yeah.

[00:02:10]And select the character.

[00:02:14]And if I move away and if I manually move my character, now you see the terrain is generating around the character.

[00:02:23]Still, you can see this is in real time.

[00:02:26]It's uh regenerating the terrain very fast. So, it's very good at in real time. You wouldn't even notice. You will still have high 100 above performance.

[00:02:40]So, yeah. Let me go. I end up in below a terrain.

[00:02:47]So, yeah. That's what the new update is. If you use this system in a walking game, then you wouldn't even Well, the initial bound will be large enough for the player to walk for a long time.

[00:03:05]And we had already implemented trust system as of the previous update 1.1.

[00:03:10]This is 1.2, the erosion layer.

[00:03:13]And yeah, now let me talk a little bit about what each of these parameters are available for you to play with.

[00:03:20]So, here let me select the world streaming manager.

[00:03:27]Let's see.

[00:03:30]Choose an angle like this.

[00:03:32]Now, here this droplets this amount this defines the number of water droplets simulated per chunk. A chunk means one of these sections in the terrain.

[00:03:46]So, the higher the number of droplets, more erosion detail will appear on ground.

[00:03:54]And erosion strength as does the name implies how aggressively droplets erode the terrain. And deposition rate defines how quickly droplets deposit carried sediment when slowing down in flat areas. And evaporation rate defines how long water droplets move before evaporation. Higher means shorter droplet paths. Lower means longer droplet paths. And sediment capacity everything is defined here. So, you can see when you hover over each parameter the tooltip appears explaining what exactly each of these parameters are doing.

[00:04:39]Just to demonstrate, let me increase this to something like 6,000.

[00:04:46]And regenerate terrain. Here.

[00:04:53]Now, you see the biggest differences in the terrain details.

[00:04:58]So, and also let me just increase this to one.

[00:05:05]And we will gain.

[00:05:08]Yeah, now you see these are more deeper these erosion channels are more deeper.

[00:05:13]So, yeah. Feel free to play with these parameters and you can achieve the look you want.

[00:05:21]So, this is running on a background thread the calculations. So, therefore it wouldn't have a minimum impact on the runtime gameplay runtime performance.

[00:05:34]And yeah, updated project files will be available here. You can download the latest latest version from my Patreon page and also wherever else that I have published this. So, yeah. Thanks for watching. And if you like to learn how to build a system yourself, you can refer to this playlist where I have implemented a similar system from scratch and explained. You can follow these episodes and implement uh runtime terrain generation system yourself, too. And don't forget to like and subscribe. Goodbye.

[00:06:23]>> [music]