Light At Top Of Wall

[garystan]

          Hi everybody :

                         Question :   What causes this light to  seem to come over the top of a wall ?   In this scene,  the other side of this wall  is an enclosed porch.   I tried raising the wall height to 8'4" (four inches above the rest of the walls).  I tried adjusting the time of day and angle of the sun.    I also figured it was the windows in the living room.  There was two....but for testing,  I removed one of them.   To see if there was a difference.   I'm not sure what else to try.
                                                                                                                         garystan

[Doug.S]

The light above the window is probably from the sun outside.  The light along the other wall does look like light leak from a missing portion of the top of the wall.

My approach would be to use a camera and look close up and through the area along that wall top top see any missing parts expected to be there...example may be no wall up thru the roof rafters. Look from inside out, outside in, and along the wall top.

I'd also try renders with turning off every light source individually, or change to light color to red/green/or blue, to see where light comes from...most likely the sun?  Knowing the light source indicates where to look for holes.

Suggest you post the .bld file for others to look/see/test.

Run a repair to .bld file to see if it fixes it. Any clue from close inspection of floorplan views or section views?

Become a super sleuth Sherlock Holmes.
Maybe some of the wall texture is transparent; such as small top of a wainscot???
Possible some part of wall is "emissive"?

[garystan]

      Doug S.  :

                          Okay !    I did an experiment.   I tried adding the roof.....no good.   I then DELETED the roof and the ceiling.  I initially INSERTED the celeing as a  "blanket"  for the entire structure..   So, after Deleting the celeing,   I re-inserted it........but........opting for   "use points".   I picked the points for the living room only.  And, if my  "hypothesis"  is correct,  maybe I should do that for each room of the house ?  Rather than blanket the entire structure with one click .
                                                                                                           garystan

[Doug.S]

As I recall, I do my ceilings "by room".  But by perimeter or by points works OK too under certain situations.

But "by points" does leave room for error if you do not overlap the interior side of the walls. 

But then you can do a special ceiling, such as a different color for a center rectangle, by 'insert by points' and make it smaller and elevate that portion slightly below the ceiling 'by room'.

Ceiling by perimeter makes it easy to have every room the same at one time.

[garystan]

      Doug S.  :

                         What you say is true.  I guess it would be easer to insert a celeing using the BY ROOM option. When I inserted the celeing using PICKING POINTS,  I made sure the edges of the celeing were at the half-width point of the walls.       Thanks for your help.

                                                                                                                      garystan

[Doug.S]

When 'ceiling by points':
you probably do not need to extend ceiling perimeter beyond the inside wall,
because if you inspect a 'ceiling by room' insert, it aligns exactly to the inside wall edge. . .

but extending it between the walls would seem to do no harm and the edge is easier to see/select in 2D.
But extend to the outside wall of the room and it makes selecting a wall in 2D view a bit harder.

Extending beyond outside wall makes the ceiling visible outside the room; usually not good/intended.

And you could make a ceiling with a hole in it; but there are better ways to cut out a hole; such as for a custom skylight in a non-cathedral ceiling.