L_World: a 200 km2 world-partitioned landscape from a seeded heightmap
Off the ladder at the user's request. Scripts/Authoring/generate_heightmap.py (numpy, installed locally by bootstrap-pylib.sh) writes a 16-bit height PNG and three 8-bit weight PNGs to Content/World/Heightmaps; create_world.py rebuilds /Game/Maps/L_World from them through ULandscapeAuthoringLibrary in the new SaltyEditor module, which wraps ALandscape::Import because the engine exposes no landscape creation to Python. Uses Elite_RockyMeadows' landscape material and layer infos (the pack itself is still uncommitted). 4033 vertices a side at 350 cm a quad; swap the PNGs and rerun to change the terrain. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This commit is contained in:
Rainer Leit
co-authored by
Claude Fable 5.1
Claude Fable 5.1
parent
0189ed9124
commit
1945ef033b
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#include "Authoring/LandscapeAuthoringLibrary.h"
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#include "SaltyEditor.h"
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#include "Landscape.h"
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#include "LandscapeInfo.h"
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#include "LandscapeImportHelper.h"
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#include "LandscapeLayerInfoObject.h"
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#include "LandscapeSubsystem.h"
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#include "Engine/World.h"
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#include "Materials/MaterialInterface.h"
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ALandscape* ULandscapeAuthoringLibrary::CreateLandscapeFromHeightmap(UWorld* World, const FString& HeightmapFile,
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const TArray<FLandscapeAuthoringWeightmap>& Weightmaps, UMaterialInterface* Material,
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FVector Location, FVector Scale, int32 WorldPartitionGridSize)
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{
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if (!World)
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{
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UE_LOG(LogSaltyEditor, Error, TEXT("CreateLandscapeFromHeightmap: no world"));
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return nullptr;
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}
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// The heightmap decides the resolution; everything else follows it.
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FLandscapeImportDescriptor HeightDescriptor;
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FText Message;
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if (FLandscapeImportHelper::GetHeightmapImportDescriptor(HeightmapFile, /*bSingleFile*/ true, /*bFlipYAxis*/ false, HeightDescriptor, Message) == ELandscapeImportResult::Error
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|| HeightDescriptor.ImportResolutions.Num() == 0)
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{
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UE_LOG(LogSaltyEditor, Error, TEXT("CreateLandscapeFromHeightmap: cannot read %s: %s"), *HeightmapFile, *Message.ToString());
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return nullptr;
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}
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const FLandscapeImportResolution FileResolution = HeightDescriptor.ImportResolutions[0];
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TArray<uint16> HeightData;
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if (FLandscapeImportHelper::GetHeightmapImportData(HeightDescriptor, 0, HeightData, Message) == ELandscapeImportResult::Error)
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{
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UE_LOG(LogSaltyEditor, Error, TEXT("CreateLandscapeFromHeightmap: cannot import %s: %s"), *HeightmapFile, *Message.ToString());
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return nullptr;
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}
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// The same layout choice the editor makes for an imported file.
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int32 QuadsPerSection = 63;
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int32 SectionsPerComponent = 1;
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FIntPoint ComponentCount;
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FLandscapeImportHelper::ChooseBestComponentSizeForImport(FileResolution.Width, FileResolution.Height, QuadsPerSection, SectionsPerComponent, ComponentCount);
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const int32 QuadsPerComponent = QuadsPerSection * SectionsPerComponent;
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const FLandscapeImportResolution RequiredResolution(ComponentCount.X * QuadsPerComponent + 1, ComponentCount.Y * QuadsPerComponent + 1);
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if (RequiredResolution != FileResolution)
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{
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UE_LOG(LogSaltyEditor, Warning, TEXT("CreateLandscapeFromHeightmap: %ux%u does not fit a component layout; expanding to %ux%u"),
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FileResolution.Width, FileResolution.Height, RequiredResolution.Width, RequiredResolution.Height);
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TArray<uint16> Expanded;
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FLandscapeImportHelper::TransformHeightmapImportData(HeightData, Expanded, FileResolution, RequiredResolution, ELandscapeImportTransformType::ExpandCentered);
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HeightData = MoveTemp(Expanded);
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}
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TArray<FLandscapeImportLayerInfo> LayerInfos;
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for (const FLandscapeAuthoringWeightmap& Weightmap : Weightmaps)
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{
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if (!Weightmap.LayerInfo)
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{
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UE_LOG(LogSaltyEditor, Warning, TEXT("CreateLandscapeFromHeightmap: a weightmap has no layer info; skipped"));
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continue;
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}
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FLandscapeImportLayerInfo Info(Weightmap.LayerInfo->GetLayerName());
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Info.LayerInfo = Weightmap.LayerInfo;
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Info.SourceFilePath = Weightmap.File;
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FLandscapeImportDescriptor WeightDescriptor;
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if (FLandscapeImportHelper::GetWeightmapImportDescriptor(Weightmap.File, true, false, Info.LayerName, WeightDescriptor, Message) == ELandscapeImportResult::Error
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|| WeightDescriptor.ImportResolutions.Num() == 0
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|| FLandscapeImportHelper::GetWeightmapImportData(WeightDescriptor, 0, Info.LayerName, Info.LayerData, Message) == ELandscapeImportResult::Error)
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{
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UE_LOG(LogSaltyEditor, Error, TEXT("CreateLandscapeFromHeightmap: cannot read weightmap %s: %s"), *Weightmap.File, *Message.ToString());
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return nullptr;
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}
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if (WeightDescriptor.ImportResolutions[0] != RequiredResolution)
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{
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TArray<uint8> Expanded;
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FLandscapeImportHelper::TransformWeightmapImportData(Info.LayerData, Expanded, WeightDescriptor.ImportResolutions[0], RequiredResolution, ELandscapeImportTransformType::ExpandCentered);
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Info.LayerData = MoveTemp(Expanded);
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}
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LayerInfos.Add(MoveTemp(Info));
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}
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TMap<FGuid, TArray<uint16>> HeightDataPerLayer;
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HeightDataPerLayer.Add(FGuid(), MoveTemp(HeightData));
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TMap<FGuid, TArray<FLandscapeImportLayerInfo>> LayerDataPerLayer;
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LayerDataPerLayer.Add(FGuid(), LayerInfos);
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// Centre the landscape on Location, as the editor centres it on the gizmo.
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const FVector Offset = FTransform(FRotator::ZeroRotator, FVector::ZeroVector, Scale)
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.TransformVector(FVector(-ComponentCount.X * QuadsPerComponent / 2.0, -ComponentCount.Y * QuadsPerComponent / 2.0, 0.0));
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ALandscape* Landscape = World->SpawnActor<ALandscape>(Location + Offset, FRotator::ZeroRotator);
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if (!Landscape)
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{
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UE_LOG(LogSaltyEditor, Error, TEXT("CreateLandscapeFromHeightmap: SpawnActor<ALandscape> failed"));
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return nullptr;
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}
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Landscape->LandscapeMaterial = Material;
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Landscape->SetActorRelativeScale3D(Scale);
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Landscape->StaticLightingLOD = FMath::DivideAndRoundUp(FMath::CeilLogTwo((RequiredResolution.Width * RequiredResolution.Height) / (2048 * 2048) + 1), (uint32)2);
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Landscape->Import(FGuid::NewGuid(), 0, 0, RequiredResolution.Width - 1, RequiredResolution.Height - 1, SectionsPerComponent, QuadsPerSection,
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HeightDataPerLayer, *HeightmapFile, LayerDataPerLayer, ELandscapeImportAlphamapType::Additive, TArrayView<const FLandscapeLayer>());
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ULandscapeInfo* LandscapeInfo = Landscape->GetLandscapeInfo();
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if (!LandscapeInfo)
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{
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UE_LOG(LogSaltyEditor, Error, TEXT("CreateLandscapeFromHeightmap: Import produced no landscape info"));
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return nullptr;
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}
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Landscape->SetActorLabel(TEXT("Landscape"));
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LandscapeInfo->UpdateLayerInfoMap(Landscape);
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for (const FLandscapeImportLayerInfo& Info : LayerInfos)
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{
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Landscape->AddTargetLayer(Info.LayerInfo->GetLayerName(), FLandscapeTargetLayerSettings(Info.LayerInfo, Info.SourceFilePath));
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const int32 LayerIndex = LandscapeInfo->GetLayerInfoIndex(Info.LayerName);
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if (LayerIndex != INDEX_NONE)
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{
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LandscapeInfo->Layers[LayerIndex].LayerInfoObj = Info.LayerInfo;
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}
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}
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if (ULandscapeSubsystem* Subsystem = World->GetSubsystem<ULandscapeSubsystem>())
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{
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if (Subsystem->IsGridBased() && WorldPartitionGridSize > 0)
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{
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Subsystem->ChangeGridSize(LandscapeInfo, static_cast<uint32>(WorldPartitionGridSize));
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}
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}
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UE_LOG(LogSaltyEditor, Log, TEXT("CreateLandscapeFromHeightmap: %ux%u vertices, %dx%d components of %d quads, scale (%g, %g, %g), %d paint layers"),
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RequiredResolution.Width, RequiredResolution.Height, ComponentCount.X, ComponentCount.Y, QuadsPerComponent, Scale.X, Scale.Y, Scale.Z, LayerInfos.Num());
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return Landscape;
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}
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@@ -0,0 +1,43 @@
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#pragma once
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#include "CoreMinimal.h"
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#include "Kismet/BlueprintFunctionLibrary.h"
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#include "LandscapeAuthoringLibrary.generated.h"
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class ALandscape;
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class ULandscapeLayerInfoObject;
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class UMaterialInterface;
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// One paint layer to import with the heightmap: the layer info asset the material expects and an 8-bit
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// greyscale file (PNG or raw) with the same resolution as the heightmap.
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USTRUCT(BlueprintType)
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struct FLandscapeAuthoringWeightmap
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{
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GENERATED_BODY()
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Landscape")
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TObjectPtr<ULandscapeLayerInfoObject> LayerInfo = nullptr;
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UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Landscape")
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FString File;
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};
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// What the editor's "New Landscape > Import" button does, callable from an authoring script. The engine exposes
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// no landscape creation to Python, so this is the project's first editor tool. Mirrors
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// FLandscapeEditorDetailCustomization_NewLandscape::OnCreateButtonClicked without the regions path.
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UCLASS()
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class SALTYEDITOR_API ULandscapeAuthoringLibrary : public UBlueprintFunctionLibrary
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{
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GENERATED_BODY()
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public:
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// Creates a landscape in World from a 16-bit heightmap file, centred on Location, with the given per-quad
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// scale (cm; Z is the engine's height scale where 100 spans -256 m to +256 m). The component layout is chosen
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// from the file's resolution; a file that does not fit a layout exactly is expanded, not resampled. In a
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// world-partitioned level the landscape is split into streaming proxies of GridSize x GridSize components.
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// Returns null and logs why on failure.
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UFUNCTION(BlueprintCallable, Category = "Salty|Authoring")
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static ALandscape* CreateLandscapeFromHeightmap(UWorld* World, const FString& HeightmapFile,
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const TArray<FLandscapeAuthoringWeightmap>& Weightmaps, UMaterialInterface* Material,
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FVector Location, FVector Scale, int32 WorldPartitionGridSize = 4);
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};
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