Iron Brigade and was previously called the "Black Hat" Brigade. The 3rd Brigade Combat Team, 1st Infantry Division was known as the Iron Brigade from its formation in 1917 through World War I, World War II and Vietnam, until some time in the early 2000s when, for reasons that are still unclear, the name was changed to Duke Brigade. The unit crest was an Iron Cross in a triangle, it appears that that was also changed. The 3rd Brigade of the 4th Infantry Division is also known as the Iron Brigade. Its unit crest is similar to the medals issued to veterans
Bézier triangle A quadratic (formula_3) Bézier triangle features 6 control points which are all located on the edges. The cubic (formula_4) Bézier triangle is defined by 10 control points and is the lowest order Bézier triangle that has an internal control point, not located on the edges. In all cases, the edges of the triangle will be Bézier curves of the same degree. A cubic Bézier triangle is a surface with the equation where α, β, γ, αβ, αβ, βγ, βγ, αγ, αγ and αβγ are the control points of the triangle and s, t, u (with 0 ≤ s, t, u