difficulty understanding reference planes
i have gone through books but could not under stand what is reference plane in sketcher menu..can someone give me a better understanding of what is a reference plane....thanks in advance...

i have gone through books but could not under stand what is reference plane in sketcher menu..can someone give me a better understanding of what is a reference plane....thanks in advance...

the reference plane decides the orientation of the sketching plane.
the reference plane can be datum plane or flat surface.
Creo(Pro/E) selects them automatically but you can select your own reference plane to orient the sketch the way you want..
Many time when the sketching plane is selected and when you enter the sketcher environment, the skecthing orientation is not the way you had desired, this happen because Creo (Pro/E) selects an automatic plane for orientation..but this you can change and re-orient so that sketching plane orients the way you like.
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