February 14, 2012, 12:25:02 pm
The flickering shadows in your latest (small) video is caused by the way the ambient/diffuse shadows work in Lumion (and many other real-time 3D applications).
Ambient shadows (also known as SSAO: Screen Space Ambient Occlusion) is an effect which applies soft shading to each pixel on the screen depending on how close 3D surfaces are to each other. Since the effect is only able to use the pixels on the screen as seen from the current camera angle, the effect "doesn't know" what's behind other objects, and can only take surfaces that face the camera into account.
All you can do is to reduce the Ambient Shadows/Ambient Scale and the Diffuse Shadow sliders, and try to avoid camera angles/movement that show the limitations of this effect.
It's probably more visible at night when using the 360 degree Ambient Lights that don't cast shadows, since you then have to compensate for the lack of shadows by increasing the Ambient Shadows/Ambient Scale and the Diffuse Shadow sliders.
(Just to avoid confusion, the subtle flickering I was referring to only seems to occur when I play the MP4s in Windows Media Player, not in VLC/QuickTime, but anyway, this is not related to the issue you're talking about)