Quote:
Originally Posted by robkar97
or have I misunderstood something?
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I believe it's a misunderstanding.
This is what the help file states on the subject:
"For slightly blurry but also very weak reflections, you can “cheat” by applying a lower Reflection Glossiness value for broader highlights while setting Reflection Glossy Samples to 0. This shoots only one mirror ray for reflections, but if they are very weak, the viewer can often not really tell."
-and-
"Note: If you set Glossy Samples to 0, the reflections take the form of a “perfect mirror” and only one ray is shot, regardless of the actual value of Glossiness . You can use this to boost performance for surfaces with very weak reflections. The highlight still respects the Glossiness value."
Therefore, if your lights are generating specular highlights (they do by default) those highlights will respect the glossiness values and spread out as you decrease the glossiness value. However, the 'actual' reflections will not blur.
For stronger glossy reflections, you'll have to use samples regardless of whether you're using the interpolation method of calculation or not.