/// <summary>
/// Constructor.
/// </summary>
/// <param name="v">4D vector to set up plane.</param>
public FPlane(FVector4 v)
{
X = v.X;
Y = v.Y;
Z = v.Z;
W = v.W;
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="vector">float vector converted to int</param>
public FIntVector4(FVector4 vector)
{
X = FMath.TruncToInt(vector.X);
Y = FMath.TruncToInt(vector.Y);
Z = FMath.TruncToInt(vector.Z);
W = FMath.TruncToInt(vector.W);
}
/// <summary>
/// Performs a linear interpolation between two values, Alpha ranges from 0-1
/// </summary>
public static FVector4 LerpStable(FVector4 a, FVector4 b, float alpha)
{
return(new FVector4(
FMath.LerpStable(a.X, b.X, alpha),
FMath.LerpStable(a.Y, b.Y, alpha),
FMath.LerpStable(a.Z, b.Z, alpha),
FMath.LerpStable(a.W, b.W, alpha)));
}
/// <summary>
/// Transforms and projects a world bounding box to screen space
/// </summary>
/// <param name="projM">The projection matrix.</param>
/// <returns>The transformed box.</returns>
/// <see cref="TransformBy(FMatrix)"/>
public FBox TransformProjectBy(FMatrix projM)
{
FVector[] vertices = new FVector[8]
{
Min,
new FVector(Min.X, Min.Y, Max.Z),
new FVector(Min.X, Max.Y, Min.Z),
new FVector(Max.X, Min.Y, Min.Z),
new FVector(Max.X, Max.Y, Min.Z),
new FVector(Max.X, Min.Y, Max.Z),
new FVector(Min.X, Max.Y, Max.Z),
Max
};
FBox newBox = default(FBox);
for (int vertexIndex = 0; vertexIndex < vertices.Length; vertexIndex++)
{
FVector4 projectedVertex = projM.TransformPosition(vertices[vertexIndex]);
newBox += ((FVector)projectedVertex) / projectedVertex.W;
}
return(newBox);
}
/// <summary>
/// Gets a bounding volume transformed by an inverted FTransform object.
/// </summary>
/// <param name="m">The transformation object to perform the inversely transform this box with.</param>
/// <returns>The transformed box.</returns>
public FBox InverseTransformBy(FTransform m)
{
FVector[] vertices = new FVector[8]
{
Min,
new FVector(Min.X, Min.Y, Max.Z),
new FVector(Min.X, Max.Y, Min.Z),
new FVector(Max.X, Min.Y, Min.Z),
new FVector(Max.X, Max.Y, Min.Z),
new FVector(Max.X, Min.Y, Max.Z),
new FVector(Min.X, Max.Y, Max.Z),
Max
};
FBox newBox = default(FBox);
for (int vertexIndex = 0; vertexIndex < vertices.Length; vertexIndex++)
{
FVector4 projectedVertex = m.InverseTransformPosition(vertices[vertexIndex]);
newBox += (FVector)projectedVertex;
}
return(newBox);
}
