I see D3DXATTRIBUTEWEIGHTS AttributeWeights; AttributeWeights.Boundary = 1.0; and I know Boundary means Blend weight, but I don't konw what blend weight means,I wondered what "Blend weight" used for ? is it used when two color is blended ? or when Animation Control,it used to blend two adjacent point to produce the next Animation frame? [Edited by - onunix on February 23, 2010 11:39:43 PM]