I can't able to figure out this algorithm. I have a semi-working one.
There is a 6 side dice.
In the starting position i can see the side A.
If its rotated from right to left i can see the side B, C, D.
If its rotated from top to bottom i can see the side E.
If its rotated from bottom to top i can see the side F.
You can't use the skin to help the algorithm.
What algorithm is able to recognize which side i can see after any rotation?

i tried to enter an image, i don't understand why didn't appear that...
example image

add 6 vertex (1 to each side)
get they´r position vith vec_for_vertex.. ask the Z-value and you got the side that is shown up.

I wrote, and i write again:
DON'T USE any skin or vertex or vortex or cortex or bartex or any other ex-ended help.

If the position of any face has the coordinates x0, y0, z0 in the start position, and the dice is rotated by the angles pan, tilt, roll the coordinates are as follows:

x = (x0*cos(pan) + y0*sin(pan))*cos(tilt) + z0*sin(tilt)
y = (x0*sin(pan) + y0*cos(pan))*cos(roll) + ((x0*cos(pan) + y0*sin(pan))*sin(tilt) + z0*cos(tilt))*sin(roll)
z = (x0*sin(pan) + y0*cos(pan))*sin(roll) + ((x0*cos(pan) + y0*sin(pan))*sin(tilt) + z0*cos(tilt))*cos(roll)

You can then check the coordinates of each face and look which is at the top.

BUT, the engine can do these calculations for you, if you use vec_for_vertex like Espér said. Why are you so against it? Look at the complexity of these formulas and how easy if would be with vec_for_vertex!

Year Aku,
its so simple with engine related functions, dont make your life harder o.O

I am really sad, i don't understand your solution with coordinates x0, y0, z0...

OK, i accept your advice, if you give me the solution how to put 6 vertex (1 to each side) to an entity after it is loaded into.
Moreover i don't know that vec_for_vertex and i don't know how should use it and its result.

uhm..

open MED => select vertex Mode => click on "Create vertex" icon => Place vertex to the model (leftklick = creating)

Then just place the vertex right, and note his ID

The ID is shown in the lower right of the MED Window, after selecting one vertex.
Shown like this (ABCD == the ID number you need to write down):



now just use vec_for_vertex with the Vertex IDs...

Thanks for your patience Espér.

I am really sorry, but i can't open the MED inside processing a lite-c script by the engine, and execute your advice and save the model and reaload. And moreover continue the running of the script.

I tried it explain in my starting post, it is a pity, nobody can't understand... (it was a really simple sentence)

The happier end of this thread is that, i have the fully working solution, naturally in lite-c.
No MED, no WED, only the engine and script.

Aku....

You know that you load the model... edit the vertex.. and save it.. BEFORE you start the script? not while running....

I can't do it with all of the more than two thousend models, and with those they will be made in the future by any others...
I need a generic solution for that case, me and the script don't know the model, and the model can't modify for the sake of any unknown outer circumstances...
Luckily, i outhammered the generic solution without modifying the models.