Hi samsue, personally, in this case, I would use the render layer ID. In this way the changes of materials and colors will be consistent with the scene and the render time shorter. Regards Paride
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2 x Evga Titan X Hybrid / 3 x Evga RTX 2070 super Hybrid
do you know how I can solve the semi-transparent border? I mean when you render the image in parts using ID you have this border that becomes transparent between layers.