View Full Version : Rendering artifacts with mia portal light

02 February 2009, 08:23 AM
My main light is a mia portal light, when i enable visible in render, i get a lot of artifacts when i render as seen in the attached image, bottom left corner of the window, below the bath, left middle of the counter top. Turning off the option fixes this. Anyone know why this is happening?

02 February 2009, 10:07 AM
looks like either glossy reflections/arealights with not enough samples or it's the architectural shader with its lame default setting, if you go into the optimization tab under the reflection section there is a parameter called "cutoff" currently set to 0.01, which means it will ignore samples that are contributing less than 1% to the final image, it can cause a lot of artifacts if you have very weak reflections in some areas.

02 February 2009, 02:02 AM
Thanks for the info. Adjusting the cutoff parameter alone got me 90% of the way there. I wasn't aware of that issue but it's good to know now.

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02 February 2009, 02:03 AM
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