Light appearing at edge of floor

[gjengi]

Post the flippin' file then, giz a look

I've tried, but it's taking so long to upload that I just gave up.

Has no-one else had this problem then? Or an answer at all?

[galinette]

Perpendicular surfaces create no problems at all during the calculation.

Not sure of this. In the special case where floor and wall are just connected by one edge, without floor extending under the wall, I guess there will be problems.

Etienne

[Lemo]

it's taking so long to upload

How about exporting a single wall or a single room and its floor?
Upload is faster and it goes straight to the problem.

[gjengi]

it's taking so long to upload

How about exporting a single wall or a single room and its floor?
Upload is faster and it goes straight to the problem.

I've reduced the file size by making the model smaller and removing the large concrete textures. The problem still occurs, albeit in a more subtle way. Here's the file. Thanks

[Bosseye]

Well, whatever the issue is, its now infected my sketchup Downloaded the file and had a play, I'm getting the same results as you with light leaking in at the joints. Tried starting a new model with a box in it, and my copy of skecthup is exhibiting the same symptoms now...

W!
T!
F!

Quite frankly.

Edit - just reinstalled Sketchup, Indigo and Skindigo, still leaking light. No idea what the problem is here!

[CTZn]

Rule of thumb with Indigo: model realistically !

Walls in real life are not infinitely thin. The reason why light would leak through a simple box edges is known and technically justified. Give that box a thickness, and you will be done !

That's why setting a big plane below enhanced results partially. Oh, and this has nothing to do with textures resolution, does it ?

Indeed displacement would... displace surfaces borders and potentially induce leaks. You can get edges stitched together while using displacement by making the edges soft, though this doesn't always look right in the SK viewport. But the render matters

[Bosseye]

Rule of thumb with Indigo: model realistically !

Walls in real life are not infinitely thin. The reason why light would leak through a simple box edges is known and technically justified. Give that box a thickness, and you will be done !

That's why setting a big plane below enhanced results partially. Oh, and this has nothing to do with textures resolution, does it ?

Indeed displacement would... displace surfaces borders and potentially induce leaks. You can get edges stitched together while using displacement by making the edges soft, though this doesn't always look right in the SK viewport. But the render matters

Hes right you know. I didn't know this was the result when you just use single planes for walls as I normally give them a thickness.

As I didn't know this leaking light was a consequence of single plane walls and floors, when I tested gjenji's model using a box with no volumes I assumed it was a bug that I'd either never noticed before as I never look that closely at the wall/floor junctions or that I'd somehow brought in a rogue setting from gjenji's model....

Awesome, thanks for the info anyway

[CTZn]

You are welcome !

Your Sketchup is safe

[Pibuz]

I'd like to tell my experience now.
When doing interiors, I RARELY (read never) give walls a thickness, and I never get any light coming through the floor joints. I always thought this was just meant to be, but here some pros say it isn't! So, why do my scenes render just right even if my walls are wafer-thin?

I experienced that problem (light leaks) when testing the 2.4.13 releases, I made the issue clear and never saw that in the later releases. I don't remember if the problem still showed up when testing GPU rendering or something..

[gjengi]

Rule of thumb with Indigo: model realistically !

Walls in real life are not infinitely thin. The reason why light would leak through a simple box edges is known and technically justified. Give that box a thickness, and you will be done !

That's why setting a big plane below enhanced results partially. Oh, and this has nothing to do with textures resolution, does it ?

Indeed displacement would... displace surfaces borders and potentially induce leaks. You can get edges stitched together while using displacement by making the edges soft, though this doesn't always look right in the SK viewport. But the render matters

I get your point and I do try and model realistically, the walls have thickness (400mm in fact), just not a bottom plane I suppose.

Surely two planes meeting should not let any light through though? As Pibuz says?

P.s. I've not used any displacement at all here, so that shouldn't come into the equation

[gjengi]

I'd like to tell my experience now.
When doing interiors, I RARELY (read never) give walls a thickness, and I never get any light coming through the floor joints. I always thought this was just meant to be, but here some pros say it isn't! So, why do my scenes render just right even if my walls are wafer-thin?

I experienced that problem (light leaks) when testing the 2.4.13 releases, I made the issue clear and never saw that in the later releases. I don't remember if the problem still showed up when testing GPU rendering or something..

Thanks Pibuz, I'm glad I'm not just going mad!

[CTZn]

Well, all in all I'm just sharing my own experience, only remember there are ways to limit the issue whenever you are bumping into it. Walls thickness, baseboards, whatever. It could happen also because of a precision issue, ie non-merged edges meant to be at contact aren't once geometries are exported. In such a case it might be better to actually intersect floor and walls by a small distance, but again, it's all empirical and scene/workflow dependent.