HP Workstation zx2000 Implementation Manual page 42

programming hints
If rescaling is disabled, f is 1, otherwise f is computed as follows:
Let m denote the matrix element in row i and column j of M
ij
the matrix as row 1, and the left most column as column 1. Then
Alternatively, an implementation may choose to normalize the normal instead of rescaling the
normal. Then:
If normalization is disabled, then the square root in the previous fully transformed normal
equation is replaced with 1; otherwise, it is calculated as dictated by the OpenGL Spec. If both
normalize and rescale are enabled, HP's implementation skips the rescale and does only the
normalize.
5–8
- 1
, numbering the topmost row of
OpenGL implementation guide