Irrlicht Engine

hi,
I have 8 vectors that build a bounding box...
and I have the transformation matrix of a node...

but how do I use the matrix to translate and rotate the vectors ???

sorry for my ignorance...

just an update...

I had to adapt the function to my code, and vice versa...
and now it works like a charm !!!

thanks for the inspiration !!!

yeah, I hear you...

then I'll have to check the source of the collision manager...
I guess I can extract just that function instead of creating a complete collision manager...

thanks anyway !!!

yes, I know, of course...
but I don't use it anywhere else...
and I don't want to create one only for this function...

Hi, I hope you're all doing well !!! :)

I wrote my own function to get a line from screen coordinates straight forward...
to create a ray for ray casting (node picking)...

it works so far...
but the screen coordinates are not calculated, it seems...
the node always stays at the center of the ...

I had to reverse my rotation order in the render loop from ZYX to XYZ...
but when I change the order in the matrix instead the calculation gives wrong values...

no big deal I can live with the render order XYZ...
but I have to change a few other things also now...

for example...
now I get wrong ...

ok, I made some test cases on Irrlicht, and then the same with my Java code...
and it turned out, the calculations were correct (same results)... :shock:

and now I get THIS:
https://www.youtube.com/watch?v=VrErHDAswP0

I hope you don't mind having one last look at this video...
I won't bother you ...

what test cases?

I don't get the same results when I change the order...
but it's always wrong...

I can't get it to work...

I tried each possible multiplication order (TXYZ, TZYX, XYZT, ZYXT)...
I also tried with/without scale...
I ported all needed functions from the Irrlicht matrix to Java...
no success !!!

I have no clue what's wrong...

of course I also had a look at your Quaternion approach...

but honestly, I don't get how to use it to rotate the axes !!!

can you give me an example on how to use your Quaternion method to rotate the 3 axes, please !?

yeah, right...

the matrix array goes from 0 to 15 for both (DX and OGL)...
how they are interpreted internally is irrelevant, 0-3 is either a row or a column, but it's always the same (0-3) in the array !!! :D

LH or RH doesn't matter at the moment...
if the result rotates the wrong direction I ...

ok, I had a look at Irrlicht's matrix4 for this methods...
and I guess I'm getting closer !!!
this methods use trigonometry, and it seems exactly what I want !!!

this are the three methods I need:
inline CMatrix4<T>& CMatrix4<T>::setRotationAxisRadians( const T& angle, const vector3d<T>& axis ...

yeah, I had a look at it...
but I can't use it, because OpenGL Matrix doesn't have the methods you're using there... :shock:
like rotateVect() and setRotationAxisRadians()...

I guessed they may are called differently...
so I tried (guessed) what methods it could be for the OGL matrix and came up ...

I made another video to explain the problem I have with this...
https://www.youtube.com/watch?v=RrD-korYraE

and I apologize for the terms error and wrong, it's just one way how it's done, but not how I want it to do... :D

everything I do, I do with a matrix (4x4)...
maybe I don't get how to use it ...

yeah, I fully aggree...
but we're talking past each other...

let me phrase my whole question differently... :lol:

I have a vector: vector3df(1, 1, 1)

now I rotate that vector 45° around Z, so I ignore X for now (0, 1, 1)...
so X and Y will change to represent the new Y axis...
I calculate X and ...