Help! This scene is an alley in my next graphic novel. The wall actually sits below the sidewalk, so there's no seepage. Yet the area in red is still there even when there's only one light- see bottom pic. Does anyone have any idea what's causing this and how to stop it?

Okay, this is weird. I place a primitive behind the wall to stop any light even though there shouldn't have been any seepage- and it stopped. This is a work-around for this time. But I'd still like to know the how and why so I can avoid this next time.

One sided single polygons (probably what your wall is made of) don't normally do well to keep light out, no matter how many of then you fit together (and thru) each other. I used to stack cubes around the outside of my sets like this to keep light from coming in - basically building a room around the outside of the walls....light won't go thru objects that have thickness, like cubes. Of course you can't do it with everything (because of windows and doors, but you CAN do it just along all the corners and it still works :).

FWIW, in this day and age of realistic render engines especially, walls with thickness (and window panes too) are essential.

Laurie

LaurieA posted at 1:53PM Tue, 29 November 2016 - #4291339

One sided single polygons (probably what your wall is made of) don't normally do well to keep light out, no matter how many of then you fit together (and thru) each other. I used to stack cubes around the outside of my sets like this to keep light from coming in - basically building a room around the outside of the walls....light won't go thru objects that have thickness, like cubes. Of course you can't do it with everything (because of windows and doors, but you CAN do it just along all the corners and it still works :).

FWIW, in this day and age of realistic render engines especially, walls with thickness (and window panes too) are essential.

Laurie

I guess that explains that then. Thanks Laurie.