3Ds Max - Skew
Skew
The skew modifier let you produce a uniform offset in an object’s geometry. You can control the amount and direction of the skew on any of three axes. You can also limit the skew to a section of the geometry.
Step1: create a box.
Fig.104
Step2: Click on modify tab and select skew tool.
Fig. 105
Step3: Set z-axis and specify skew amount.
Fig.106