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Add GetDistanceToConvex2D in pre-converted space

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Steve Streeting 2023-11-24 14:57:09 +00:00
parent f47d80b62e
commit c3c7d29d05
1 changed files with 22 additions and 10 deletions
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32
Source/StevesUEHelpers/Public/StevesMathHelpers.h
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@ -101,19 +101,14 @@ public:
/** /**
* Return the distance to a convex polygon in 2D * Return the distance to a convex polygon in 2D where points are in the same space
* @param ConvexPoints Points on the convex polygon, anti-clockwise order, in local space * @param ConvexPoints Points on the convex polygon, anti-clockwise order, in a chosen space
* @param ConvexTransform World transform for convex polygon * @param LocalPoint Point to test, in same space as convex points
* @param WorldPoint Point in world space
* @return The distance to this convex polygon in 2D space. <= 0 if inside * @return The distance to this convex polygon in 2D space. <= 0 if inside
*/ */
static float GetDistanceToConvex2D(const TArray<FVector2f>& ConvexPoints, static float GetDistanceToConvex2D(const TArray<FVector2f>& ConvexPoints,
const FTransform& ConvexTransform, const FVector& LocalPoint)
const FVector& WorldPoint)
{ {
checkf(ConvexTransform.GetMaximumAxisScale() == ConvexTransform.GetMinimumAxisScale(), TEXT("Non-uniform scale not supported in GetDistanceToConvex2D"));
const FVector LocalPoint = ConvexTransform.InverseTransformPosition(WorldPoint);
// Assume inside until 1 or more tests show it's outside // Assume inside until 1 or more tests show it's outside
bool bInside = true; bool bInside = true;
float ClosestOutside = 0; float ClosestOutside = 0;
@ -146,8 +141,25 @@ public:
} }
} }
return bInside ? ClosestInside : ClosestOutside;
}
/**
* Return the distance to a convex polygon in 2D world space, converting between spaces
* @param ConvexPoints Points on the convex polygon, anti-clockwise order, in local space
* @param ConvexTransform World transform for convex polygon
* @param WorldPoint Point in world space
* @return The distance to this convex polygon in 2D space. <= 0 if inside
*/
static float GetDistanceToConvex2D(const TArray<FVector2f>& ConvexPoints,
const FTransform& ConvexTransform,
const FVector& WorldPoint)
{
checkf(ConvexTransform.GetMaximumAxisScale() == ConvexTransform.GetMinimumAxisScale(), TEXT("Non-uniform scale not supported in GetDistanceToConvex2D"));
const FVector LocalPoint = ConvexTransform.InverseTransformPosition(WorldPoint);
// Need to rescale distance back up to world scale, only uniform scale supported for simplicity // Need to rescale distance back up to world scale, only uniform scale supported for simplicity
return (bInside ? ClosestInside : ClosestOutside) * ConvexTransform.GetScale3D().X; return GetDistanceToConvex2D(ConvexPoints, LocalPoint) * ConvexTransform.GetScale3D().X;
} }
}; };