Rendering Issues with Mental Ray

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  04 April 2013
Rendering Issues with Mental Ray

Recently while I've been trying to render a scene with Mental Ray, I've noticed that whenever I stop the render, then continue from that point a little later on, the lighting seems to be different. While I haven't changed anything in the file, it still changes from the last rendered frame to the most recent. At first I thought it may be a result of a cache in 3DS max or something, but I later disabled that under the final gather render options. In addition to the lights changing, it seems like one light that is linked to a moving part isn't actually moving with the rest of the object, and so the glow from it stays behind. Below are two rendered frames, the first was done on one pass, then I paused the render, and continued later on (without changing the file), and there are significant differences in the shadows/lighting. Any ideas as to what this could be? I'm at a loss.

  04 April 2013
To me, it looks like your light distribution is "Sphere" instead of "Diffuse".
A spherical light distribution distributes the light in a sphere, as the name implies.
A diffuse light distribution will distribute the light out in the local direction of the light source, and only forward, unlike a spherical distribution.
  04 April 2013

After sifting through more of the settings for final gather, I uncovered several more areas where there are options for various caches. The very last tab under the Indirect Illumination Tab is called Reuse (FG and GI Disk Caching). In this area there was an option to chose a mode that is suited for Walkthroughs/Stills and a mode for Animated Objects. My lights now seem to all render properly and don't change if a stop a render and pick it up again later.
  04 April 2013
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