BB, you're on record as saying that the final decimal places were important in shader calculations, and I've cited that thread elsewhere. However I was made aware of the accuracy of the IEEE754 floating point arithmetic used in the UI code a while back, and I should amend my article on scale to take that into account. Am I right in thinking that the 0.00000458 discrepancy is connected with the material room's use of inches rather than PNU elsewhere? It won't matter to most people, but I like to know these things. You never know when a seemingly insignificant fact may become important.

(Edit: I can't seem to cite the exact post in thread 2765126. 'Twas ever thus.)