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We've had a longstanding irritation with DR where buckets during the IR phase show as a gray but when rendering everything is perfect. Tended to happen on some scenes but not others and never really tried to figure out what it was & eliminate it.
I think I figured it out. I hope so at least. We almost always enable "show calc phase" with IR maps and I'm finding the gray bucket problem occurs when the VFB exposure slider is *under exposing* the image. For instance, a scene that renders too bright we'll back the VFB exposure off during simple tests but then the IR map gives gray buckets. The more you under expose, the grayer some of the buckets become. *NOTE* this doesn't affect the data in the IR map, it's only related to the display of the IR calculation. My guess is that VRay is passing non-float IR preview buckets between the nodes when in fact it should be sending the full-float data.
Anybody else seeing this? VRay 1.5 sp6, 3ds Max 2010.
Here's an example image:
I think I figured it out. I hope so at least. We almost always enable "show calc phase" with IR maps and I'm finding the gray bucket problem occurs when the VFB exposure slider is *under exposing* the image. For instance, a scene that renders too bright we'll back the VFB exposure off during simple tests but then the IR map gives gray buckets. The more you under expose, the grayer some of the buckets become. *NOTE* this doesn't affect the data in the IR map, it's only related to the display of the IR calculation. My guess is that VRay is passing non-float IR preview buckets between the nodes when in fact it should be sending the full-float data.
Anybody else seeing this? VRay 1.5 sp6, 3ds Max 2010.
Here's an example image:
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