Quote - What you want to do is impossible. You're trying to use a Blinn (or any other Specular node) to represent that light is available from that direction, and modulate the reflection map based on shadows falling from that direction. But the Blinn node can only turn on within a hemisphere. That's why you get the sharp edge - it simply cannot "see" the light beyond the "horizon".

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when i use the Blinn node i dont get the sharp shadows around the edge. with the Bllin node i found some other problems. will post  renders.