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Won't there be differences (although they MAY not be visible) on how samples are laid out with LC, IRR and Photons, since these are all based on a random engine (as with procedurals: shaders, particles, wind, etc) which again is based directly on the (different) processing architecture ?
Of course, but this shouldn't really matter that much, as these things are not guaranteed to be constant even now - e.g. with multithreading, the irradiance map is likely to be slightly different even between successive renderings on the same machine, depending on the order in which the different processors/cores process the buckets.
Is that a problem with DWG import or file linking?
Both DWG import and file linking. Because some objects have been drawn in a different UCS (I'm not an MDT person, so don't quiz me on this one!) the RealDWG module of Max that was introduced in version 8 fails to account for this and the objects in the drawing are all placed based on a 0 UCS. Something to that extent, anyhow.
They've acknowledged that there is an issue, but that gets us no closer to a fix!
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