Rotation - how is your rocket science?

Rotation is a total furffy for me.

I have a line:

PRIM_TEXTURE, 2, "Volume 5", <0.075,0.390,0>, <0.315,0.290,0>, -90

Obviously -90 is not going to give me -90 degrees - How do I get it?

I have read the wiki page but even more confused after doing so.

Thanks

to change degrees to quarternions (rotation) u have to first change it to radians and then to rot. The code would look like:
rotation rot = llEuler2Rot(<0, 0, -90> * DEG_TO_RAD);

errr - if you say so - thanks I'll muck around with it

And the context please!
This is merely a string of parameters and I am not going to guess for what
A piece of advice:
1.All angles in LSL are in radians, except in those functions that convert from degrees to radians.
2.A rotation is not an angle(not degrees and not radians) but "quaternion" composed of 4 numbers each in the range: [-1.0;1.0].

The context is :

llSetPrimitiveParams([PRIM_TYPE, PRIM_TYPE_BOX, 0, <0.0, 1.0, 0.0>, 0.0, <0.0, 0.0, 0.0>, <1.0, 1.0, 0.0>, <0.0, 0.0, 0.0>, PRIM_SIZE, <1.009, 0.702, 0.160>, PRIM_TEXTURE, 2, "Volume 5", <0.075,0.390,0>, <0.315,0.290,0>, ??????]);

I am setting prim paramters and one of the textures needs to be rotated -90degrees.

In that context, you just need to convert degrees to radians... no quaternions or vectors needed. Here's what you'd need:

-90 * DEG_TO_RAD


So your complete call would be:

lSetPrimitiveParams([PRIM_TYPE, PRIM_TYPE_BOX, 0, <0.0, 1.0, 0.0>, 0.0, <0.0, 0.0, 0.0>, <1.0, 1.0, 0.0>, <0.0, 0.0, 0.0>, PRIM_SIZE, <1.009, 0.702, 0.160>, PRIM_TEXTURE, 2, "Volume 5", <0.075,0.390,0>, <0.315,0.290,0>, -90 * DEG_TO_RAD]);

You are a God's send - thankyou

OK, Professor Ponzu will pontificate...

As already pointed out, the -90 is an angle in degrees. The Editor uses degrees. But scripts use "radians" which is sort of like converting from dollars to Euros.

Radians = degrees * DEG_TO_RAD.

It turned out you didn't really need rotations, but I will explain anyway, for future generations to appreciate and admire

In the editor, we use three numbers, in degrees, to describe a rotation. These three numbers are called an "Euler" (famous dead mathematician). For example, <10, 20, 30> (like you could put in the rotation windows in the Build Editor).

This means 1) rotate 30 degrees around the Z-axis, then 20 degrees around the Y axis, then 10 degrees around the X axis. This of a jet airplane. This would be 30 degrees to the left, 20 degrees down, and then 10 degrees of bank.

However, in LSL, we don't use Euler's directly. We use a data type called a "rotation". So, to set the rotation of our plane, we might need to convert the Euler to a rotation, like this.

rotation r = llEuler2Rot( <10,20,30>*DEG_TO_RAD );

llSetRot( r );

chuckle

and since you now know that it's in radians, you can actually use the built in constants....

PI = 180deg
PI_BY_TWO = 90deg
TWO_PI = 360deg (useless for this, but helpful elsewhere)