and now it works :-)
Pom73
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well well well! currentPassdescriptor is created for the scnrenderer after my renderPipelinedesc. It seems therefore that the renderpipelinestate was therefore set with improper information ( texture type, sample count etc... ). I am a bit in the fog as to why the pass descriptor is actually valide after the first call to renderNode but I guess that s for another thread :-)