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Wrong type of rotation, this fixed it.



void rotatesp(JSGEfloat angle, JSGEfloat* X, JSGEfloat* Y)
{
float ra;
ra = (angle/360) * (2*M_PI);

float normalx=*X;

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I have a 3D game with a simple opengl game engine. Each object in the game has an X,Y,Z position.

I want to make a rotating map of an overview of the objects positions. I can...

This is just my mental block, I've made this same mistake before. data is char* so I always expect (wrongly) data+offset to behave at pointer + offset bytes. I will try and learn ! Thanks again.

Great job, thanks :)

I originally started with this:

struct dev_state *ds = (struct dev_state *)data+sizeof(struct jcp_header);

Compiled ok, but did not work? The extra brackets are...

void jcp_parse_and_reply(char *data, int len, char *ipaddr)
{
struct jcp_header *jcpheader = (struct jcp_header*)data;
struct dev_state *ds = (char*)data+sizeof(struct...

That works a treat, thanks :-)

I am getting careless in my old age...

Returns 17 not my expected 15 as GCC quite reasonably aligns data[] to a 32 bit boundary.

I am trying to work out the difference (in bytes) between two members of a packed structure.

The structure is defined like this:


struct __attribute__((packed)) jcamsys_msg_image
{
...