void UBlendSpace1D::GetRawSamplesFromBlendInput(const FVector &BlendInput, TArray<FGridBlendSample> & OutBlendSamples) const
{
FVector NormalizedBlendInput = GetNormalizedBlendInput(BlendInput);
float GridIndex = FMath::Trunc(NormalizedBlendInput.X);
float Remainder = NormalizedBlendInput.X - GridIndex;
const FEditorElement* BeforeElement = GetGridSampleInternal(GridIndex);
if (BeforeElement)
{
FGridBlendSample NewSample;
NewSample.GridElement = *BeforeElement;
// now calculate weight - GridElement has weights to nearest samples, here we weight the grid element
NewSample.BlendWeight = (1.f-Remainder);
OutBlendSamples.Add(NewSample);
}
else
{
FGridBlendSample NewSample;
NewSample.GridElement = FEditorElement();
NewSample.BlendWeight = 0.f;
OutBlendSamples.Add(NewSample);
}
const FEditorElement* AfterElement = GetGridSampleInternal(GridIndex+1);
if (AfterElement)
{
FGridBlendSample NewSample;
NewSample.GridElement = *AfterElement;
// now calculate weight - GridElement has weights to nearest samples, here we weight the grid element
NewSample.BlendWeight = (Remainder);
OutBlendSamples.Add(NewSample);
}
else
{
FGridBlendSample NewSample;
NewSample.GridElement = FEditorElement();
NewSample.BlendWeight = 0.f;
OutBlendSamples.Add(NewSample);
}
}
void UBlendSpace::GetGridSamplesFromBlendInput(const FVector &BlendInput, FGridBlendSample & LeftBottom, FGridBlendSample & RightBottom, FGridBlendSample & LeftTop, FGridBlendSample& RightTop) const
{
FVector NormalizedBlendInput = GetNormalizedBlendInput(BlendInput);
FVector GridIndex;
GridIndex.X = FMath::TruncToFloat(NormalizedBlendInput.X);
GridIndex.Y = FMath::TruncToFloat(NormalizedBlendInput.Y);
GridIndex.Z = 0.f;
FVector Remainder = NormalizedBlendInput - GridIndex;
// bi-linear very simple interpolation
const FEditorElement* EleLT = GetEditorElement(GridIndex.X, GridIndex.Y+1);
if (EleLT)
{
LeftTop.GridElement = *EleLT;
// now calculate weight - distance to each corner since input is already normalized within grid, we can just calculate distance
LeftTop.BlendWeight = (1.f-Remainder.X)*Remainder.Y;
}
else
{
LeftTop.GridElement = FEditorElement();
LeftTop.BlendWeight = 0.f;
}
const FEditorElement* EleRT = GetEditorElement(GridIndex.X+1, GridIndex.Y+1);
if (EleRT)
{
RightTop.GridElement = *EleRT;
RightTop.BlendWeight = Remainder.X*Remainder.Y;
}
else
{
RightTop.GridElement = FEditorElement();
RightTop.BlendWeight = 0.f;
}
const FEditorElement* EleLB = GetEditorElement(GridIndex.X, GridIndex.Y);
if (EleLB)
{
LeftBottom.GridElement = *EleLB;
LeftBottom.BlendWeight = (1.f-Remainder.X)*(1.f-Remainder.Y);
}
else
{
LeftBottom.GridElement = FEditorElement();
LeftBottom.BlendWeight = 0.f;
}
const FEditorElement* EleRB = GetEditorElement(GridIndex.X+1, GridIndex.Y);
if (EleRB)
{
RightBottom.GridElement = *EleRB;
RightBottom.BlendWeight = Remainder.X*(1.f-Remainder.Y);
}
else
{
RightBottom.GridElement = FEditorElement();
RightBottom.BlendWeight = 0.f;
}
}
