While that's the correct rounding method, it can also be implemented by adding 0.5 and truncating. 2.4 + 0.5 = 2.9 truncates to 2 2.6 + 0.5 = 3.1 truncates to 3 Though I think there have been changes within Poser that altered what happens to an exact .5 value in some of the shader math functions.