How do make it so that a block can only be placed on a solid block?

[uneven osprey]

I want it to be like a snow layer, where it can't be placed on any surface that doesn't have a 16 by 16 collision on the top side of it. Ex. Place a snow layer on a trapdoor and open it.
I am using minecraft:placement_filter.
Although i am considering using a command that deletes the block and a molang that will do the job as well.

[versed rain]

You could use script api. Placement filter is good as well, though you would need to list every block

[uneven osprey]

I am unaware of scripting api but my other idea is using an event with a condition that will delete the block below

someone said to use above_top_solid but i don't think that returns a float and is probably rounded up or down.

[versed rain]

That returns the y value

[uneven osprey]

yeah

[versed rain]

Which is useful for world generation

[uneven osprey]

but i think it would be useful for returning the height of a block

if it returns something like y=-60.9 or something

then i can do something if it returns a decimal

in other words if above_top_solid(0, 0) mod 1 returns something other than zero

[uneven osprey]

can you tell me if it returns an integer or float?

[versed rain]

https://bedrock.dev/docs/stable/Molang#query.above_top_solid

[uneven osprey]

I'm sorry but it doesn't tell me if it returns an integer or a float for the y value.

[versed rain]

Not sure why you would need to even use this query, it doesn't help

[uneven osprey]

true, do you have any other ideas?

[versed rain]

My ideas

[uneven osprey]

Sorry i don't know where to begin using scrpting api for this

[versed rain]

https://learn.microsoft.com/en-us/minecraft/creator/documents/scriptingintroduction?view=minecraft-bedrock-stable, You can also search or open new posts in #1067535382285135923 for further assistance

[uneven osprey]

I saw something that says that this is only supported with windows, so i'd rather not use this. Besides, i would perfer it if everything stays within my custom block's json file.

[versed rain]

Scritping works on all platforms

Then your other choice is to list every block in the placement filter

[uneven osprey]

Yeah.

[uneven osprey]

Update: that feeling when u can just add an exclamation point to negate everything :0

Damn

:(