Examples or docs

[eriksvedang]

Hi, thanks for the library! I have searched for some example code using the library (or docs). Does anyone know of anything?

Thanks,
Erik

[datenwolf]

Well, linmath.h was a header I added to whenever I needed, I copied it around a lot and unfortunately I have a number of variants on my system, which I really have to merge into a single version eventually. When it comes to documentation, well, this was the least priority for the thing. When releasing this I hoped the function prototypes themself would be self explanatory. The essential idea is that for non-scalar types the first parameter points to where the result goes and the other parameters are the operands. Scalar results are delivered through the function return value.

[eriksvedang]

OK, that makes sense, thanks for the answer! Perhaps you can tell me if this is a good way of using the functions or if there is a better method?

    mat4x4 M;
    mat4x4_identity(M);

    mat4x4 M2;
    mat4x4_identity(M2);

    mat4x4_rotate(M2, M, 0.0f, 0.0f, 1.0f, angle);

[papa-agoo]

@eriksvedang: this is perfectly valid, since you are passing arrays to the functions. an array is in fact just a pointer to the first element of that array.

int a[3] = { 1, 3, 9 }; // a[2] == *(a+2)

as you can see, a is just a pointer to the first element of an array of 3 ints.

[eriksvedang]

Mhm, I was just worried that I'm creating an unnecessary amount of matrices (M and M2), perhaps it could be done with just a single one?

[papa-agoo]

Just think of M as a non identity Matrix. Your own example is just a bit misleading. :)

mat4x4_rotate() expects an input matrix (M) which may contain other transform operations. On the other hand you keep your matrices separated which can be used individually later on.

// good
mat4x4 model, view, projection;
... 

// bad
mat4x4 mvp;
...