A 3x3 floating point matrix.  
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#include <eina_matrix.h>
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double  | xx | 
|   | xx in x' = (x * xx) + (y * xy) + xz 
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double  | xy | 
|   | xy in x' = (x * xx) + (y * xy) + xz 
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double  | xz | 
|   | xz in x' = (x * xx) + (y * xy) + xz 
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double  | yx | 
|   | yx in y' = (x * yx) + (y * yy) + yz 
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double  | yy | 
|   | yy in y' = (x * yx) + (y * yy) + yz 
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double  | yz | 
|   | yz in y' = (x * yx) + (y * yy) + yz 
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double  | zx | 
|   | zx in z' = (x * zx) + (y * zy) + zz 
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double  | zy | 
|   | zy in z' = (x * zx) + (y * zy) + zz 
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double  | zz | 
|   | zz in z' = (x * zx) + (y * zy) + zz 
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A 3x3 floating point matrix.