We are still testing and playing with the light and shadow effects in OpenSim using Kirstens s17 viewer.
What do we think so far? We love it! No if’s no but’s!
Problems yeah we always have problems a day without them means we haven’t tried hard enough
We had some corrupted prims maybe?, We think that was the problem happened to a few roofs light was streaming in, in places it should not let light in. Deleting the prim and adding a new one fixed that.
Prims that have been cut or hollowed we have had problems with them so we have replaced them with whole prims.
Of cause transparent texture is just that transparent and do mot cast a shadow so our blinds are now made of prims.
We have some nice looking trees and plants that we haven’t worked out how to use. We have at times used an old linden tree or fern together with them to cast a shadow, companion planting
Light as you can see in the photos adds depth to the picture. All of a sudden we have a lot of control, that makes the environment more complex but that is exactly what we wanted.
What once was an exciting world is now even more exciting. OpenSim really is very good.

No Light source top photo

Light intensity 0.5 radius 3m falloff 0.75

Light intensity 0.75 radius 3m falloff 0.75

The vase only has a Blank added as texture so all the shading is dynamic how good is that ?? All photos taken as snapshots .jpg high res only cropped no other editing