The green and the blue surfaces are of the same type: created with 3 straight lines and one spline line, using the “Surface from planar curves” command. There has been the same material assigned to it (plastic, transparency 0%, reflectivity 100%, clarity 85%). On the blue surface, I have black shadows, and not on the green surface. Why? Even if I select the blue surface and I do a “Match” command, selecting the green surface, the black shadows remain. Can somebody explain to me, what I did wrong?
I found out! Just stupidly, the blue surface is at the lowest level, so it is on the same level as the rendering bottom. The black part and blue part mix is because the 2 plans (my blue surface and the rendering bottom) overlap. Just had to add a dummy object on a lower level, making the rendering bottom go down, to have it solved