CPU / GPU difference when material applied to selection

[peterDTE7K]

Hello, in this stripped down scene I applied leather material to part of the mesh using selection. When rendered with CPU the result is correct. Same scene rendered with GPU is incorrect (middle image). When I apply the leather to whole sofa instead the result is correct on GPU (right image). Do you know what is wrong? I use C4D R26.107 and C4dtoa 4.4.0

thank you

[peter_horvath · Accepted solution]

Looks like a bug with displacement set on a polygon selection and autobump enabled. Autobump renders fine on the GPU when the whole mesh is displaced, but not when only a selection is displaced.