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feat: add decoded members for IPlacedComponent #191

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feat: add decoded members for IPlacedComponent #191

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feat: add decoded members for IPlacedComponent
poirierlouis Nov 21, 2025
949a4a2
style: fix clang-format issue
poirierlouis Nov 21, 2025
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21 changes: 19 additions & 2 deletions include/RED4ext/Scripting/Natives/entIPlacedComponent.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -20,13 +20,30 @@ struct __declspec(align(0x10)) IPlacedComponent : ent::IComponent
static constexpr const char* NAME = "entIPlacedComponent";
static constexpr const char* ALIAS = "IPlacedComponent";

struct ChildBinding
{
Handle<ent::IComponent> component; // 00
Handle<ent::IAttachment> attachment; // 10
};

Handle<ent::ITransformBinding> parentTransform; // 90
uint8_t unkA0[0xC0 - 0xA0]; // A0
DynArray<ChildBinding> childrenTransforms; // A0
uint8_t unkB0[0xC0 - 0xB0]; // B0
WorldTransform localTransform; // C0
WorldTransform worldTransform; // E0
uint8_t unkE0[0x120 - 0x100]; // 100
Vector4 lastPosition; // 100

@wopss wopss Nov 21, 2025

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What would lastPosition mean in this context? Can the component move itself?

@poirierlouis poirierlouis Nov 22, 2025

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position should be equal to worldTransform, but with different precision due to float / FixedPoint conversion.
lastPosition seems to be a tick/frame in the past regarding position.

@seberoth seberoth Nov 22, 2025

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Just my though: currentPosition / previousPosition seems more understandable then position / lastPosition

@poirierlouis poirierlouis Nov 22, 2025

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Thanks, I wasn't sure about the naming. I'll change it when I'll have another go with RedMemoryDump to record "frames" at a faster tick rate and confirm handle type.

@psiberx psiberx Nov 22, 2025

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It seems odd that position is stored twice. For non moving, non animated entity the transform and both positions are always the same?

@poirierlouis poirierlouis Nov 22, 2025

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Hum, I'll check those.
But Vector4 values clearly shows valid coordinates and seems a tick behind.

@psiberx psiberx Nov 22, 2025

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IIRC working on RHT, I've seen a lot of zeroes there for visual components. Which component type are you testing right now?

@poirierlouis poirierlouis Nov 23, 2025

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TransformComponent from a gamePuppet.

@poirierlouis poirierlouis Nov 29, 2025 •
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I checked the constructor of IPlacedComponent (hash 3069184773).
It contains:

[this + 0x100] = 7F7FFFFF7F7FFFFF7F7FFFFF7F7FFFFF
[this + 0x110] = FF7FFFFFFF7FFFFFFF7FFFFFFF7FFFFF

So it gives us:

Vector4 previousPosition = Vector4(NaN, NaN, NaN, NaN);
Vector4 currentPosition = Vector4(NaN, NaN, NaN, NaN);

@psiberx psiberx Nov 29, 2025

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I think it's a Box.

Vector4 position; // 110
};
RED4EXT_ASSERT_SIZE(IPlacedComponent::ChildBinding, 0x20);
RED4EXT_ASSERT_OFFSET(IPlacedComponent::ChildBinding, component, 0x00);
RED4EXT_ASSERT_OFFSET(IPlacedComponent::ChildBinding, attachment, 0x10);

RED4EXT_ASSERT_SIZE(IPlacedComponent, 0x120);
RED4EXT_ASSERT_OFFSET(IPlacedComponent, parentTransform, 0x90);
RED4EXT_ASSERT_OFFSET(IPlacedComponent, localTransform, 0xC0);
RED4EXT_ASSERT_OFFSET(IPlacedComponent, worldTransform, 0xE0);
RED4EXT_ASSERT_OFFSET(IPlacedComponent, lastPosition, 0x100);
RED4EXT_ASSERT_OFFSET(IPlacedComponent, position, 0x110);
} // namespace ent
using entIPlacedComponent = ent::IPlacedComponent;
using IPlacedComponent = ent::IPlacedComponent;
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