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Last active March 10, 2025 07:20
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unreal notes.md

ViewSpace

Z+ = Forward, Y+ = Up, X+ = Right

//SceneView.cpp

void FViewMatrices::Init(const FMinimalInitializer& Initializer);

// first 3 rows of ViewRotationMatrix
// {0, 0, 1, 0}
// {1, 0, 0, 0}
// {0, 1, 0, 0}

Clip space Z=1 is the near plane

See the comment in code

//SceneView.h

struct FSceneViewProjectionData
{
	/** UE projection matrix projects such that clip space Z=1 is the near plane, and Z=0 is the infinite far plane. */
	FMatrix ProjectionMatrix;
 }

ProjectionMatrix

void FMinimalViewInfo::CalculateProjectionMatrixGivenViewRectangle(const FMinimalViewInfo& ViewInfo, TEnumAsByte<enum EAspectRatioAxisConstraint> AspectRatioAxisConstraint, const FIntRect& ConstrainedViewRectangle, FSceneViewProjectionData& InOutProjectionData)


FReversedZPerspectiveMatrix
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