FOSS gamedev and creative worlds

Hi
I'm a noob and trying to do some basic stuff.

My code looks like this:

I'm trying to do this:
, but instead of doing in the command line, want it to happen in the display.

Where did I go wrong? It doesn't display a result.
Is there a better way to do this?

There are a number of issues with what you have written.

In both of the chat commands you have written local a/b. This makes a/b local to the function, not the file, so they can't be accessed outside their respective function. You need to declare a local a/b outside of any function for it to be file-local.

You have then written the result calculation and chat_send_all call outside of any function. This means that it will be called while the mod is initialising, before either of the two values has been set. IDK why this isn't causing an error, but you need to call it later instead, such as in a third chat command.

Also param is a string, you need to convert it to a number if you want to do arithmetic on it later. This can be done with tonumber().

Thanks
I see you do a lot of work in Minetest. I was trying to work on basic coding examples that use Lua and work within Minestest, to teach some basic programming to kids.

Got any good ideas for simple simple programmes for kids, who'll generally have no idea of coding?

Are you looking for demo ideas (so that complex stuff can be used behind the scenes to make the code look better) or are you looking for code that the kids can write?

It is quite hard to think of examples which don't go too deep into the minetest API and are interactive, but on_palce/on_rightclick maybe a good starting point.

Code that kids can write or adapt would be the ideal.

So I've taken a LUA loop - write Hello World 10 times to lay 10 blocks side by side.
That's the kind of progression I had in mind. And I think all they can probably handle!
The API has always been a sticking point (not just in Minetest) for me. It's what separates the "men from the boys".

And I'm barely a lad!!!
Thanks for the example - if you've got others, it'd be great!

qwertymine3
I tried this, in anew mod folder called "teaching"


Am I correct in assuming that if I place a dirt node, it will then change the node to water.
It doesn't seem to change anything.

basil60 wrote:qwertymine3
I tried this, in anew mod folder called "teaching"

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

minetest.register_craftitem("teaching:conditionals",{
    description = "Change dirt to water!",
    stack_max = 1,
    inventory_image = "default_water.png",
    on_place = function(_,_,pointed_thing)
        local looking_at = minetest.get_node(pointed_thing.under)
        if looking_at.name == "default:dirt" then
            minetest.set_node(pointed_thing.under,{name = "default:water"})
        end
    end,
})

Am I correct in assuming that if I place a dirt node, it will then change the node to water.
It doesn't seem to change anything.

It creates a "teaching:conditionals" item that you can use to turn dirt into water by right-clicking the dirt with it.

Thanks
so how can I access that item. Does it put it into one's inventory? Do I need to manually add it to inventory.

You would have to use /giveme teaching:condtionals or the creative inventory menu

Also this may be a good example of these types of loops.

Cheers

I'll look at it...

So the /giveme worked OK.
I slightly changed the code you gave me:


It now returns an error when I right click on a dirt block:

Hope I'm not just being thick.

basil60 wrote:So the /giveme worked OK.
I slightly changed the code you gave me:

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

            minetest.set_node(pointed_thing.under,{name = "default:water"})


Hope I'm not just being thick.

The name needs to be default:water_source

Thanks
That's perfect

Here is an example for the basic for loop

Thank you

Qwertymine3 - another really noob question - how do you get rid of the geyser?

Place nodes through the center of the geyser to remove the source nodes