Correct normal transformations for articulated models
Merry, Bruce, Patrick Marais and James Gain (2006) Correct normal transformations for articulated models. Technical Report CS06-01-00, Department of Computer Science, University of Cape Town.
It is well-established that when a matrix is used to transform a rigid object, the normals should be transformed by the inverse transpose of that matrix. However, this is only valid where the transformation matrix is locally constant. This is not the case for models animated with skeletal subspace deformation (SSD), where the transformation matrix is computed for each vertex. We derive a formula for correctly transforming normals on SSD models.
|EPrint Type:||Departmental Technical Report|
|Keywords:||skeletal subspace deformation, normal transformation|
|Subjects:||I Computing Methodologies: I.3 COMPUTER GRAPHICS|
|Deposited By:||Merry, Bruce|
|Deposited On:||28 March 2006|