Torch light shining through cave walls

Robert Feyerharm · June 2020

I'm making a silly mistake somewhere that's allowing torch light to shine through my cave passage walls, I just can't figure out what it is.

Monsen · June 2020

Can't see anything obviously wrong from that screenshot. Could you post the map file?

Robert Feyerharm · June 2020

Sure, here it is. Thanks Monsen!

Monsen · June 2020

It's your Floor sheet which is the problem. You have set up point light on this sheet as well, and that causes the light to be "carried along" on the floor.

The reason for this behavior is that light is set up to cast light on the light blocking object itself, but not behind it (which is also why light goes "into" the wall, but doesn't continue on to the room at the other side of the wall). With floors being part of the light calculation, light would continue on to the edge of the floor (or the edge of the light source, if smaller).

Just turn off the point light effect on the FLOORS sheet, and the wall problem should be fixed.

Robert Feyerharm · June 2020

That worked, thank you!

Although when I turn off the point light effect on the FLOORS sheet, I now see shadow effects from furniture projected onto the cave walls:

mike robel · June 2020

Interesting. One could maybe use this stuff to wargame a tunnel fight...

Monsen · June 2020

Posted By: RobertFAlthough when I turn off the point light effect on the FLOORS sheet, I now see shadow effects from furniture projected onto the cave walls:

Yes, anything blocking the light will prevent it from reaching the wall, causing that effect. But what you probably want to do for low-height items like furniture is to NOT use an infinite shadow length, that should only be used for sheets containing floor to ceiling entities like walls and doors.

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Torch light shining through cave walls

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