UKismetMathLibrary::TransformVector4
#include "Kismet/KismetMathLibrary.h"
Access: public
Specifiers: staticBlueprintPure
Description
Multiplies a FVector4 by an FMatrix (Matrix * Vec4) and returns the resulting FVector4. Performs a full 4x4 homogeneous transform including the W component, making it suitable for projective transformations.
Caveats & Gotchas
- • Unlike FTransform-based helpers, this operates on raw FMatrix and includes the W row/column — perspective divide is NOT done automatically, so if you need NDC coordinates from a projection matrix, you must divide XYZ by W yourself.
- • Argument order is Matrix then Vec4 (column-vector convention); reversing them will give a transposed transform. Note that FMatrix::TransformFVector4 and this function are equivalent but with argument order swapped.
Signature
static UE_INL_API FVector4 TransformVector4(const FMatrix& Matrix, const FVector4& Vec4);Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| Matrix | const FMatrix& | The 4x4 matrix to transform by. | — |
| Vec4 | const FVector4& | The four-component vector to transform. | — |
Return Type
FVector4 Example
Project a world-space point to clip space C++
FMatrix VP = ViewMatrix * ProjectionMatrix;
FVector4 ClipPos = UKismetMathLibrary::TransformVector4(VP, FVector4(WorldPos, 1.0f));
// Perspective divide for NDC:
FVector NDC = FVector(ClipPos) / ClipPos.W;See Also
Version History
Introduced in: 4.0
| Version | Status | Notes |
|---|---|---|
| 5.6 | stable | — |
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