Slab and stairs lighting incorrect

Just an FYI: placing a light source above these blocks will remove the glitch. However I am aware that it is still a bug.

This also happened to me in 1.3.2.

this also happen to corner stairs

This Is A Long Standing Bug, If You Want To Remove That Horrible Effect, Place A Torch Above The Slab/Have No Blocks Above The Unlit Slabs

@Arthur

Just an FYI:

Your wierd habit of capitalising the first letter of every word is really difficult to read. I'm not trying to be annoying, it's genuinely hard to read your comments

Yeah, I know, sorry, this 'habit' annoys me too.

This error make this effect in my underground temple (that has no other blocks above his roof). When it's day, the roof is lightened, when it's night, the roof turns black.

Related is MC-2399 where I have analysed the source of the problem. In short: Transparent blocks take their brightness from the block above or the 4 blocks beside them, but not from the block below them. They should take their brightness either from the block itself or at least from all 6 adjacent blocks.

Still having this issue in 1.4.5. Upper-half-slab adjacent only to full blocks is dark. Not sure if any of the screenshots capture this, I can post one if you want. (No client mods)
[[edit]] Blocks were only lit from below.

Lightning bug on half Steps and Stairs already there on v.1.4.5

They were talking about fixing it in 1.4.* but they pushed trying to fix it in the next update. I also heard that if they fix it the way they know how to it would slow minecraft considerably.

I can confirm this. I have many buildings with upside-down half slabs as the ceiling/floor and they still look buggy. However, they look normal if the block exactly above them is not occupated.

Here are some screenshots.
<EDIT: Uploaded the screenshots properly>

In the first screenshot, there are only two sofas (like the ones in the 1st floor) right above the ceiling.
In the second screenshot, there are blocks right above every slab.

Gustavo, it is recommended that you attach screenshots directly here.

I can confirm this in 1.4.4, 1.4.5 and 1.4.7.

can someone post this screenshot please? It wont work on my browser for some reason

Thanx Tails

In case you tried to use "Attach Screenshots" pro tip: use "Attach Files" instead.

It's being fixed \o/

should be resolved now (in 13w05a)

Can we get a confirmation of whether this happens in 13w10a and an update to the affected versions? If it doesn't affect the current version it should be marked as resolved.

I was unable to reproduce the slab shadow issue in the latest snapshot (13w10a). Not sure about the stairs.

This still happens in pre1.5 for me , at least for slabs

I see the issue in the 1.5 pre-release, too.

Should be complete dark. Still totally b0rked lighting on stairs and slaps in 13w11a …

I noticed that this only happens when "Smooth Lighting" is set to "Off". I went back to 13w10a and checked with Smooth Lighting Off and it was, in fact, still in that version. If people can't see it, they may have a different lighting setting.

Also, it's still in 1.5.

On 1.5.1. So annoying because my floor is made of half slabs so anywhere I have crafting tables, my basement gets black spots.

The same issue applies for my MC 1.5.1
My Smooth Lighting is set to "maximum" and this problem still occurs

This same issue as to why half slabs display black.
Its because of blocks are treated the same.
Additional blocks are treated different.

Stairs and Slabs are treated different than blocks.

Bottom line: Minecraft is code is poorly done. But remember this was one of the first things ever coded by the guy!
If only all of us could do such a great job on our first try! It just needs some refinement and TLC...

It also happens when stairs are placed upside down and a slab in the middle.
This is a sewer that I made and it depends on what is placed above ground what the lighting will be like in the sewer. I tried different things but nothing solves it.

But puting Smooth lighting on maximum reduces the blackness of the 'shadow'

yes, because non-solid opaque blocks like slabs and stairs get the lighting from the block up it or on the sides, not on the botton. to make the thing wor, we will need a new stair/halfblock lighting system this happens because the engine was crated before the "you can put slabs and stairs upsidedown" update, so, it will not get light from the under part of it, because it is blocked. Now, to fix that, mojang can make dynamic block lighting for slabs and stairs, supporting every direction they can turn. Sory for my bad english, i'm from brazil.

Here it is:

1. Before
2. The Glitch
3. Stair block replaced with regular block

This bug should be updated to show it still affects version 1.6.2.

Confirmed for 13w36a !

Still happening (with less severity than 1.4 and 1.5) in 1.6.4.

Is also with ladders and blocks around and one above it

Windows 7 64-Bit
Java 7
Creative
MC 1.6.4

Confirmed for 1.7.2

Still exists in 1.7.4. If you have a hollow area underground and place slabs against the ceiling, any slabs exposed to direct sunlight will show black from below when the room is lit with a torch and no other light can get in. Same with stairs.

Appears to have been partially fixed as of 1.7.4. A ceiling of slabs, as in the second and third pictures, now behaves as expected in most cases from what I have observed.

I am still seeing this on 1.7.4 with Smooth Lighting off. I believe I've resolved the problem with a mod I'm working on. In the ChunkCache class in the getSkyBlockTypeBrightness method, I've replaced the line "return var5;" with these lines:

int varGLC = this.getSpecialBlockBrightness(par1EnumSkyBlock, par2, par3 - 1, par4);

                    if (varGLC > var5)
                    {
                    	var5 = varGLC;
                    }
                    
                    return var5 <= 0 ? var5 : var5 - 1;

Could any modders out there check my changes for any side effects I haven't noticed?

I am NOT seeing this issue in 14w06b.

Look at Block and Sky Light... Huge bug since ever.. 🙂

Still happens with 1.7.4...I tried mixing slabs and stairs in a ceiling, and in certain sides of the stairs black squares appears if you put a slab nearby. Very annoying.

Confirmed for 1.7.5 and 14w11b

I am also experiencing this issue, but only in 14w11b, not 1.7.5. Half slabs are darker than full slabs and other blocks. Sometimes only one side of the half slab appears darker. This only occurs when smooth lighting is activated. Additionally, the space above the slab is NOT occupied. The bug occurs independently.

14w11b has this bug but it may be a new form. I don't remember this lighting quite this strangely in earlier 1.8 snapshots.

...indeed, the bug has gotten much worse in the newest snapshots.

It happens in the 1.7.9 version.

I am seeing shading errors in 14w20b that are not present in 1.7.9. I have uploaded two images that show the error and also how the same exact scene appears in 1.7.9. Environment for both images is clear weather, clouds off, time = 6000, and the viewing direction is south-southwest.

The snapshot version:
http://www.richardspens.com/images/shared/2014-05-21_17.35.jpg

The 1.7.9 version:
http://www.richardspens.com/images/shared/2014-05-21_17.34.jpg

@Richard You should probably just attach the images here. Both of your links 404.

Color me a little dumb, but I have just now figured out how to attach them here. The first one is from 1.7.9, the second is from 14W20b.

Is this still a concern in Snapshot 14w25b or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

It appears to me that this seems to be fixed in 14w26b. Any others confirm this?

can confirm fix

@qmagnet, @FVbico: Can you confirm that it no longer happens when "Smooth Lighting" is set to "Off"?

makes no diffrence for me, still fixed on my pc

Seems to be fixed with smooth lighting off as well.

This issue still exists for me in 14w26b with slabs and stairs. Smooth lighting is set to maximum.

This issue was fixed for me in 14w25b. It remains fixed, with smooth lighting set to MAXIMUM or to OFF.

This is what I'm experiencing in 14w26c. I'm using Windows 7 64 bit with Java 7 64 bit. Smooth lighting is set to Maximum.

The light from a pumpkin partially bleeds around stairs to create unusual bright spots and shadows.

Removing the pumpkin, you can see that light bleeds through a ceiling of half slabs to leave the top layer bright and the rest of the room in darkness.

14w26c and smooth lighting seems to fix this completely. If I turn off smooth lighting it's still not perfect but definitely acceptable.

@@unknown What you observe is not the issue of this ticket.
See for example this

,

or

The effect with your staircase is working by design since slabs and stairs are transparent.

Good to see one of the oldest issues finally fixed. Awesome job, Mojang!

Reopened, occurs again in a different way in latest version
See also MC-105271 and MC-107124

To be more precies: the stairs/slabs let light through them (javaw_2016-09-27_18-52-33.png and javaw_2016-09-27_18-52-12.png).

i have the same issue after updating TU46 I'm on xbox 360

Confirmed for 1.12-pre2

Affecting 18w16a

Hello,

I have this bug too. (18w22c)
(I attached a picture above in the big picture list (2018-05-31_22.57.33 <- the Name from the picture))

Confirmed for 1.13-pre1

Confirmed for 1.13-pre3

Confirmed for 1.13-pre5

Confirmed for 1.13-pre4 & 6.

Confirmed in 1.13-pre7.

Confirmed for 1.13-pre8.

Confirmed for 1.13-pre9.

Confirmed for 1.13-pre10.

Confirmed for 1.13.

Confirmed for 18w30a.

Confirmed for 18w31a.

Confirmed for 18w32a.

Confirmed for 18w33a.

Confirmed for 1.13.1.

Confirmed for 1.13.2-pre1.

Confirmed for 1.13.2-pre2.

This looks much better in 18w46a, but I maybe wouldn't mark it as "fixed":
1.13.2:

18w46a:

*Edit: Also, the corner block in the middle of the image is an outward facing stair.

That is smooth ligthing and a different issue: MC-12558

Not completely fixed (18w46a):

How it still can be reproduced in 18w46a:

• Place blocks in the following shape

• Surround it with (full) blocks so that the lower slab is in full darkness

• The top of that lower slab should now be dark but it is still bright

So I think this bug should be reopened

Please create a new ticket about any potential issues with the new lighting. This ticket is ancient and won't be reopened.

Appears in 1.14.4

Then please create a new ticket.