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Fix multiplication symbols typos and remove useless parentheses

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Meseira
2017-08-24 09:54:27 +02:00
parent 1032ab3a5d
commit d2b796bb51
1 changed files with 2 additions and 3 deletions
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learning/features/math/matrices_and_transforms.rst
+2 -3
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@@ -373,7 +373,7 @@ However, this is not the same:
# yields a different results
pos = (transform1 * transform2).xform(pos)
Because in matrix math, A + B is not the same as B + A.
Because in matrix math, A * B is not the same as B * A.
Multiplication by inverse
-------------------------
@@ -409,8 +409,7 @@ For 3 levels:
::
# due to reverse order, parenthesis are needed
var global_xform = gradparent_matrix + (parent_matrix + child_matrix)
var global_xform = gradparent_matrix * parent_matrix * child_matrix
To make a matrix relative to the parent, use the affine inverse (or
regular inverse for orthonormal matrices).