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I'm creating an ifc importer.

I'm creating some simple beam with rotation about X , about Y and about Z.

These are the matrixes that i get:

1)Rotation about Z

0.8|0.5|0.0

0.0|0.0|1.0

-0.5|0.8|0.0

i know that the real rotation about Z is :

0.8|0.5|0.0

-0.5|0.8|0.0

0.0|0.0|1.0

then i must swap the axis y with z

1)Rotation about X

0.0|0.8|0.5

1.0|0.0|0.0

0.0|-0.5|0.8

i know that the real rotation about X is :

1.0|0.0|0.0

0.0|0.8|0.5

0.0|0.5|0.8

then i must swap the axis y with x

1)Rotation about Y

0.8|0.0|0.5

0.0|1.0|0.0

0.8|0.0|0.8

that is a correct Y rotation matrix.

Exist a matrix that multiplied for the Z matrix rotation swap the y axis with the z axis and

that multiplied for the X matrix rotation swap the y axis and the x axis?

thanks.

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# I'm creating some simple beam with rotation about X

Can you offer guidance or do you also need help?

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