Unreal Engine 4.26 Preview

General Announcements
436

I used 4.26 p5 source. When I run the GenProjFiles.bat it won’t run. “GenerateProjectFiles ERROR: It looks like you’re missing some files that are required in order to generate projects. Please check that you’ve downloaded and unpacked the engine source code, binaries, content and third-party dependencies before running this script”. Have you tried to compile 4.26 p5?

437

Ray traced burley SSS suffers from heavy artifacts, even with high samples override:

Burley_SSS_RT.jpg
Burley_SSS_RT.jpg954×771 56.2 KB

438

I didn’t try, my machine is currently too busy to compile for now. Later I will give a try.

439

Did I use the right source?

440

It seems like you may have not run Setup.exe first :]

Try that and let me know what happens.

441

Links for source

for 4.26 p5: https://github.com/EpicGames/UnrealEngine/releases/tag/4.26.0-preview-5
for 4.26 p4: https://github.com/EpicGames/UnrealEngine/releases/tag/4.26.0-preview-4

442

Do I have to modify TargetRules.cs. If so how? It is compiling now.

443

Anything after Preview 5 currently, yes. You would need to change bCompileChaos and bUseChaos back to true, undoing what was changed here.

444

I did the change. It is compiling. Will the Chaos fracture appear in the modes?

445

UntamedLoi it worked. Thanks big time.

446

So the current compiled 4.26 p5 build does not have chaos enabled even though it shows up in the plugins fine? Currently the fracture mode does not show up and previous working assets no longer function.

447

They have opted to not include Chaos after feedback, for 4.26 so preview 5 reflects that and is a reversion to Physx. With Chaos coming Q1 2021 it seems, so they can focus on it being more stable.

448

Thanks, managed to get rid of that error but now I have this

449

FYI, In UE4.26 Preview 5 source, If you get compile error in HeadlessChaos project, It’s a false positive.
Because HeadlessChaos project doesn’t check chaos build flag from UE4 project.
The HeadlessChaos project is just an automation test project.

450

You guys, it isn’t necessary to revert the engine change to bCompileChaos and bUseChaos in order to get Chaos to work again. Although you do need to build from the Github source, as far as I’m aware the following isn’t possible with the Epic launcher-distributed binaries.

In your MyGame.Target.cs, make your constructor look something like the following (using the Chaos Destruction Demo as an example):



public ChaosDestructionDemoTarget(TargetInfo Target) : base(Target)
{
    Type = TargetType.Game;

    ExtraModuleNames.AddRange( new string] { "ChaosDestructionDemo" } );

    **bCompileChaos = true;**
    **bUseChaos = true;**
}

In your MyGameEditor.Target.cs, you should make the same change, and additionally add bOverrideBuildEnvironment = true; (otherwise UnrealBuildTool will not accept modifying the UE4Editor target defaults).

451

Hi,

I have some problems with GPU Lightmass, it calculates the light but the final result is complete black. Does anyone else have this problem?

Thanks:)

452

I have a problem with water in 4.26 preview 5, worked in Preview 3 but now whenever I move any point in the ocean or river spline it resets everything, ignores all the water body splines.

What am I doing wrong here? Doesn’t matter if I have distance field turned on. Landscape, Shallow Water, Water and Volumetrics plugins are on. Halp.

453

So if Chaos is being walked back for 4.26, does this mean we will be getting a 4.27? Doesn’t seem like something they would add in a hotfix. The reason I ask, is because I know they specifically said they wanted us on Chaos before UE5.

454

I just compiled 4.26 p5 source and Chaos is there.

455

The GitHub master branch is on 4.27, and the issue tracker also have a lot of issues assigned to 4.27, so that’ll definitely be a version.