About Transform rotation, how to rotate based on I J K ?

You can also check your transformations while you are doing them by measuring features with the transform window open. I'll measure a point on a plane and check its vector to make sure I've done all the rotations needed.
​

{"alt":"Click image for larger version Name:\timage.png Views:\t9 Size:\t132.9 KB ID:\t538718","data-align":"none","data-attachmentid":"538718","data-size":"full","title":"image.png"}​

Something I find even easier is to have the Probe Readouts window open with the CAD coordinates displayed. The CAD coordinates and vector at the mouse pointer position will be displayed in real time. So, as you do transforms you can swipe the mouse over a surface to see its position and to check the vector to see if it is level.

This can also be a way to check if a surface is planar. If the vector values do not change as you sweep the cursor over a surface then you know it is flat, even if the surface is at a funky angle.

Note: The Probe Readouts window precision is based on the DISPLAYPRECISON setting at the current cursor position in the Edit window. So, when I use this to check CAD transforms, I like to set this value high so I can be really sure that I have rotated a surface to be square to an axis. Below you can see that a surface is squared up to within 6 decimal places.

​ ​

You can also check your transformations while you are doing them by measuring features with the transform window open. I'll measure a point on a plane and check its vector to make sure I've done all the rotations needed.
​

{"alt":"Click image for larger version Name:\timage.png Views:\t9 Size:\t132.9 KB ID:\t538718","data-align":"none","data-attachmentid":"538718","data-size":"full","title":"image.png"}​

Something I find even easier is to have the Probe Readouts window open with the CAD coordinates displayed. The CAD coordinates and vector at the mouse pointer position will be displayed in real time. So, as you do transforms you can swipe the mouse over a surface to see its position and to check the vector to see if it is level.

This can also be a way to check if a surface is planar. If the vector values do not change as you sweep the cursor over a surface then you know it is flat, even if the surface is at a funky angle.

Note: The Probe Readouts window precision is based on the DISPLAYPRECISON setting at the current cursor position in the Edit window. So, when I use this to check CAD transforms, I like to set this value high so I can be really sure that I have rotated a surface to be square to an axis. Below you can see that a surface is squared up to within 6 decimal places.

​ ​