No radiosity, 3 spots, rendertime less then 7 seconds:
With radiosity, 3 spots, 1 light emitting sources in interior of the vehicle, 300 iterations, rendertime 19 secons:
How does the light source look like for radiosity?
It is only a cube with the setting Emitting on 1 in shaders.
And whats this? Why is this video rotated 180 degree?
Sometimes YouTube doesn't recognise raw-Avi???