zwitschi
4f3ed20e49
The physics asset could not be made from Python (PhysicsAssetFactory exposes no mesh property), so a small editor-only C++ helper calls FPhysicsAssetUtils::CreateFromSkeletalMesh - the same code path as the editor's Create Physics Asset action. It produces PA_Vehicle_Sedan with 6 bodies and assigns it to SK_Vehicle_Sedan. AGigLineVehicle is a Chaos wheeled pawn that configures its four wheels from the modelled dimensions (radius 33 cm, wheelbase 278, track 156) and is staged in DemoMap. A run logs: spawned at (-12950, -900, 120), 4 wheel setups settled at Z 494 cm, simulating=1, speed=0 cm/s That last line is the defect and it is not hidden: the vehicle rests 3.7 m above the road, so the generated physics bodies do not match the mesh. Recorded in TODO.md with the next step - inspect the bodies against the mesh, then either fix the creation params or author two boxes and four wheel spheres explicitly.
35 lines
1.1 KiB
C++
35 lines
1.1 KiB
C++
#pragma once
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#include "CoreMinimal.h"
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#include "Kismet/BlueprintFunctionLibrary.h"
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#include "GigLineVehicleBuilder.generated.h"
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class UPhysicsAsset;
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class USkeletalMesh;
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/**
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* Script-callable helpers for vehicle setup.
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*
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* Chaos Vehicles need a PhysicsAsset, and Unreal's `PhysicsAssetFactory` exposes no mesh
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* property to Python, so the asset cannot be generated from a commandlet. The body does
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* the job with `FPhysicsAssetUtils::CreateFromSkeletalMesh`, which is the same code path
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* the editor's "Create Physics Asset" action uses.
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*
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* Editor only: it is compiled into the editor target and never shipped.
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*/
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UCLASS()
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class GIGLINE_API UGigLineVehicleBuilder : public UBlueprintFunctionLibrary
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{
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GENERATED_BODY()
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public:
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/**
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* Build (or rebuild) a physics asset for `Mesh` at `PackagePath`/`AssetName`.
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*
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* @return the created asset, or nullptr with the reason written to the log.
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*/
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UFUNCTION(BlueprintCallable, Category = "GigLine|Vehicle")
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static UPhysicsAsset* BuildPhysicsAsset(USkeletalMesh* Mesh, const FString& PackagePath,
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const FString& AssetName);
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};
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