12 Jul
2010
12 Jul
'10
8:54 p.m.
On 12 July 2010 22:43, Misha Koshelev misha680@gmail.com wrote:
Thank you Henri for the explanation. In fact it seems that this flag is default on D3DXComputeTangentFrameEx:
D3DXTANGENT_WEIGHT_BY_AREA Weight the direction of the computed per-vertex normal or partial derivative vector according to the areas of triangles attached to that vertex. Mutually exclusive with D3DXTANGENT_WEIGHT_EQUAL.
Actually, looking at the docs for D3DXComputeTangentFrameEx() a bit more closely, it says in the description for dwOptions that if neither D3DXTANGENT_WEIGHT_BY_AREA nor D3DXTANGENT_WEIGHT_EQUAL is specified it does indeed weight the normals by the the angle of the outgoing edges for that face.