Hi Greg, Thanks.
The scene except for the reflective surface is black and I’m only interested direct and direct reflected calculation for the mirror surfaces. That’s why ab is set to 0. I changed the value for lw but it didn’t change the results.
To clarify, I get the expected results for the other points and the sun is reflected during the hours that it should. The issue is that the first point always sees all the modifiers. It is also covered with the roof and the walls. As I said if I copy the same x, y, z point twice the second one generates the results as expected.