First of all, thank you very much TAK2HATA for your precious work. I am liking Mitsuba-san more and more.
I am going to propose you some things, I don't know if they are of simple implementation or not .
1)I said it in my previous post already, sorry for repeating: rendering of objects animation made in sketchup using proper-animation plugin or similars.
2)Implementing a non-raytracing rendering algorithm similar to Houdini software or similar to compare the results with different techniques.
3)Rendering texture transparencies properly (maybe it's already possible but I couldn't do it) as explained in the following pictures. The first one is just exported directly from sketchup and you can see that the fence texture is shown with transparent parts but the shadows are like if it was a non-transparent texture; the second is rendered with Twilight and you see it has transparent parts in the texture and the shadow is properly calculated as if made by just the black parts of the texture; the third one is made with Mitsuba-san and it has no transparent parts both in the texture and in the shadow.
Thanks in advance for your time and patience.
宜しくお願いします。