This is bugging me.

another issue is that i'm using the following code (checked whenever he walks):

//find player position
	px = PlayerGet(P_ X) ;
	py = PlayerGet(P_Y);

	//set box corner coords
	boxx = px+8;
	boxy = py-14;
	boxw = px+10;
	boxh = py+6;

	boxa = MaterialRead(boxx,boxy,boxw,boxh);
println("box a");
println(boxx,boxy,boxw,boxh);
println(boxa);

This should in theory print the material type of whatever is to the right of him. Instead it prints '1' everywhere, no matter what he's stood next to. {yolkfolk}:scratch:

Well, the idea is to be able to find what materials are inside a given rectangle. And since there can be more than one, and since it's faster to return a single integer value than a table) I chose to return this info on bits.

I could've set it to test for a single density and tell if it is or not found inside the rectangle, but then you'd have to call it for every density you need to test. And that wouldn't be so fast.

So, each bit in the returned integer number correspond to a density value. Bit 0 is for void (0) and so on. If a bit is set than the corresponding density was found. If it's not, then no material with the corresponding density is inside the rectangle.

In the given example, if void (0) and block (2) densities were found, their bits were set so this mean ..0000101 which has the decimal value of 5. In fact correctly is "hard" not "block". "Hard" is the density (defined by MATD_HARD with value 2) and "block" is the material which the script template define it by MAT_BLOCK with value 7) and it has nothing to do with the ReadDensities function.

0000 = 0
0001 = 1
0010 = 2
0011 = 3
0100 = 4
0101 = 5

You can use bit operators to test it:

ret = MaterialDensityRead( x, y, w, h )
if( ( ret & (1 < < MATD_HARD) ) != 0 ) ... there's some hard blocker there ...
// 1 < < MATD_HARD has the binary value 100 and the decimal value 4
// no space between < < of course

Hope it was clear.

The box should be given as x, y, w, h, not x1,y1,x2,y2. Perhaps that is the thing.

oh! oops. Having said that, I've fixed it, and it's still only returning '1'.

mask_air = (1 < < MAT_AIR);
if( ( ret & (~mask_air) ) != 0 )

where would I put that, and how would I test in a specific rectangle? This is my current code:

//find player position
	px = PlayerGet(P_ X) ;
	py = PlayerGet(P_Y);

	//set box corner coords
	boxx = px+8;
	boxy = py-14;

	boxa = MaterialRead(boxx,boxy,2,16);
println("box a");
println(boxx,boxy);
println(boxa);

	//set box corner coords
	boxx = px-10;
	boxy = py-14;

	boxb = MaterialRead(boxx,boxy,2,16);
println("box b");
println(boxx,boxy);
println(boxb);

	if(boxa==1&&boxb==1) return 1;
	else return 0;

'boxa' and 'boxb' print as '1' the whole time. even when the rectangle is in front of block material or my 'climb' material. very odd.

//find player position
	px = PlayerGet(P_ X) ;
	py = PlayerGet(P_Y);

	//set box corner coords
	boxx = px+8;
	boxy = py-14;

	boxa = MaterialRead(boxx,boxy,2,16);
        mask_air = (1 < < MAT_AIR);
        if( ( boxa & (~mask_air) ) != 0 )
            return found_other_materials_than_air

Oh, here's the mistery:

1. Player's position returned by PlayerGet(P_ X) is in world coordinates and coresponds to the center of the player (at mouth)
2. The read material functions need the coordinates in room space

Do like this

px = PlayerGet(P_ X) - GameGet(G_ROOM X) *GameGet(G_ROOMW);
py = PlayerGet(P_Y) - GameGet(G_ROOMY)*GameGet(G_ROOMH);
boxx = px+8;
boxy = py-14;
boxa = MaterialRead(boxx,boxy,2,16);
println (boxa);

and move the player with the mouth inside other material

I tested this in the update handler and it showed a different value there

1. Player’s position returned by PlayerGet(P_ X) is in world coordinates and coresponds to the center of the player (at mouth)
2. The read material functions need the coordinates in room space

oh bloody bloody hell {dizzy}:mad: