if I use a model as a sky, I must scalieren it and move. that goes without SKY flag.
What exactly does the SKY falg at ball models?

If you want to use a sky- cube, scene, dome or cylinder -> add the SKY flag to it.

Anyway, you want to move/scale a sky object? Perhaps as a SCENE?
Iirc you can change sky objects in functions lateron:

function blablabla()
{
...
skySphere.scale_x = 5;
}

But dont quote me on this, never tried it except for hiding and showing sky objects.

OK
but i dont want use sky cube, dome or cylinder.

What is it you are trying to do exactly?

Sky objects are mainly there if you dont want to let your sky objects cover other objects. But in some cases you could use a entity that is far away so it doesn't block other objects and e.g. set the NOFOG flag for it.

I would like that a mdl object do not other objects obscuring.
now i will try the NOFOG flag
edit: i have no problems with fogs
edit2:
in the manual the example works only for sprites

This seems to work for me for models too:



However, normal entities do not seem to always cover the sky object , which they should. I think this a bug (?) and remember a thread of myself of it with a solution: http://www.opserver.de/ubb7/ubbthreads.php?ubb=showflat&Main=54891&Number=457187#Post457187

i have realy enought about thinking about bugs.
I remember it was a fbx import in med and in wed, i have maked a video and oneday the future was not more.
but i have the same versions like everybody.

would You give me a demo Projekt? You can use my sky.mdl.
sky1.mdl

I am having a bit of trouble following you, and besides from the bug I mentioned in my previous post there seems to be nothing wrong with your sky1.mdl for this example. Except that its mesh is open, but that is not important now.

I think the easiest fix for you is to make it very big and far away so it doesn't cover anything else.

Or if you want to use the model as a sky sphere, than model a hollow sphere and let it move every frame with your camera xyz.

i dont want move the Modell by the script by a while function.
But 1st i have to read waht you wrote in the link

use a simple shader with custom vertex shader and adjusted blend and z-pass modes. the vertex shader just doesn't apply any camera transformation (only matModel * matProjection) and renders only in the background (ZFunc = Greater)