On the delphigl forum is pointed to the fact that when a uniform is not used in an shader it is not availeable. Next to that somewhere during the day something on my pc became corrupted as source that did not work yesterday now works :-)

Here is the bugfixed version: http://www.noeska.net/downloads/ogl3bones3.zip and for those who are interested the original: http://www.codesampler.com/oglsrc/og...m#ogl_skinning