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After using other 3D Apps I have become used to Y being up, and Z being depth (Depth pass, Z pass etc).

Is there a way to make Blender a Y-up world, and if not, does anyone know why they chose to be different ?

Leon Cheung
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humbleroller
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Duplicate Question. See: Is it possible to make Blender a Y-up world?

"The standard orientation, where the xy-plane is horizontal and the z-axis points up" is part of the Right Handed Orientation coordinate system. It is not "being different" as much a choice between Left or Right Handed systems. Each design team makes there own choices when they first start coding.

Community
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Map Monkey
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    This is incorrect, the handedness of a coordinate system refers to which direction the z-axis points relative to the x and y axes and is separate from which axis is up. For example the conventional coordinate system for CAD applications is right-handed with z up while the one for VFX and animation software is right-handed with y up. – jedfrechette Feb 14 '14 at 00:26