Signlike drawtype not being lit smoothly across large areas

[VanessaE]

When using the signlike drawtype to place objects on the ceiling or walls (in this case, two separate, smoothly-tilable images), any light from sources in the room or from a window is being distributed across those tiles very coarsely. See this screenshot for an example:

(Notice the ceiling "paint")

Code used to produce the ceiling covering:

minetest.register_node('homedecor:ceiling_paint', {
    description = "Textured Ceiling Paint",
    drawtype = 'signlike',
    tile_images = { 'homedecor_ceiling_paint.png' },
    inventory_image = 'homedecor_ceiling_paint_roller.png',
    wield_image = 'homedecor_ceiling_paint_roller.png',
    sunlight_propagates = true,
    paramtype = 'light',
    walkable = false,
    groups = { snappy = 3 },
    sounds = default.node_sound_leaves_defaults(),
        selection_box = {
            type = "wallmounted",
                         --wall_top = <default>
                         --wall_bottom = <default>
                         --wall_side = <default>
                        },
})

[nerzhul]

is this bug already present ?

[VanessaE]

Still present in current git, also affects some other drawtypes actually (really, anything that isn't a normal cube). Signlike was just the first one I noticed at the time this was filed.

[Fixer-007]

I can confirm it, still present in git. Screenshot: http://i.imgur.com/iy4myvR.png

[paramat]

Is this not just the fact certain nodes cannot have smooth lighting?

[stormchaser3000]

paramat: voxelands has smooth lighting on nodeboxes

[ghost]

Apparently it's not just nodeboxes but also nodes that are transparent? I'm trying to get CaveRealm's thin ice texture to be smoothly lit, but it seems that because it is transparent that I can not.

[Fixer-007]

RBA said in another topic:

This is not a bug but our lighting system. slabs, stairs, all nodeboxes, plants, rails, meshnodes, etc are using internal light of the node. solids blocks calculate that for all 6 faces. So, the effect is different for them.

To make stairs for example have same lighting as solid nodes there should be added special drawtype that would use the same method. Code itself doesnt know whats "similar" to full sized node...
IMHO not easily fixeable, but i will think about possible solutions.

[paramat]

@VanessaE seems not a bug, only cubic nodes have smooth lighting, all else uses a single light value for the whole node.
Can this be closed?

[PilzAdam]

@paramat don't close this, it can be seen as a feature request to improve the lighting system.

[Fixer-007]

Objection! Smooth lightning support in minetest is incomplete and needs finishing.

[paramat]

This is the original issue for lack of smooth lighting on non-cubic nodes, so should be kept open.

[paramat]

Snow nodeboxes.

[numberZero]

https://github.com/numberZero/minetest/tree/dev-light-smooth
(stairs use meshes and my system support only nodeboxes yet)
Of course there are bugs, this is WIP. It even crashes sometimes... (it seems it can’t handle nodes adjacent to an unloaded area).

[numberZero]

Now works for mesh nodes too:

Note: may impact performance!
Note: crash is not fixed yet

[Fixer-007]

Please YES. Can you make a PR? We need this badly! I will also try it out.

[numberZero]

I can’t make a PR yet, it crashes( The reason is that in order to render a node it needs to access its surrounding, but it may not be available on the mapblock boundary. Now thinking how to work around that.

[MarkuBu]

Great job

[paramat]

\0/