devkitPro

Good spot! Sometimes code just needs another pair of eyes to see the problem. I fixed that and managed to get much further, I almost have all of the maths I need to start work on my game!

I've attached my current status, in the demo, rotate with the D-Pad and press A to translate at the direction ...

I was able to find an atan2Lerp function here:

http://www.coranac.com/2009/02/on-arctangent/

All I need now is a function which moves the model at the angle that it is rotated at (by the quaternion).

So first of all I need a quaternion to euler function, I found one here:

http://www ...

I've given it a go but sadly it's not as simple as:

#define atanLerp(a) ((int32)(atan((double)a / (double)4096.0) * (double)4096.0))

I tried to convert the radians to degrees and then convert the degrees to a DS angle with:

#define atanLerp(a) degreesToAngle(atan((double)a / (double)4096.0 ...

I came across a problem. I need to implement a quaternion to euler function, however all of the formulas I have found online rely on atan or atan2. Unfortunately libnds does not have any inverse tan functions. Is there a work around for this?

Many thanks once again!

I think your main issue is dealing with fixed point numbers. There is no automatic conversion to and from floats - and you have a lot of mixing of the two in your code. I have not fixed all of the code - just the bare minimum needed to get the teapot to spin around the y axis. you should be able to ...

Here's what I've got at the moment:

http://www.321webs.com/download/80285.htm

As you can see from the code, I'm really not sure of what I should be doing.

Thanks for the help.

I have a model loaded, but I'm having trouble rotating it correctly in 3D space.

When using Euler angles the axis change after each rotation:

glRotatef(angleX, 1.0f, 0.0f, 0.0f);
glRotatef(angleY, 0.0f, 1.0f, 0.0f);
glRotatef(angleZ, 0.0f, 0.0f, 1.0f);

If I reorder them, the resultant ...

I am aware that it is possible to write to the microSD using stdio calls with libfat, for example:

FILE *f = fopen("gameSave.bin", "wb");
fwrite(data, dataLen, 1, f);
fclose(f);

However I was wondering if it is possible to write data the same way as a commercial game, so that the flashcard ...

I tried recording a buffer and getting the volume, but I couldn't get it to work.

I am using this example:

devkitPro\examples\nds\audio\micrecord\

In the micHandler function I add this to the end:

static u8 oldsmp = 0;
register s8 smp_s = (*(char *)data) ^ 0x80;
register u8 smp = ((smp_s < 0 ...

I want to have 4 layers of `BgType_Text8bpp` backgrounds on both screens, with extended palettes, each with their own map and tile space in VRAM.

Somehow PAlib managed to do this, but since I've been using libnds, I have not been able to achieve the same thing.

Here is the VRAM configuration I am ...