Select the blue/inverted line polygons and go to Functions/Reverse Normals or Functions/Mesh/Reverse Normals. This helps to see when you have a material on your object. You can also turn on the Normals from the Viewer Options and the lines will show which way the normals are facing. Polygons that are a tinge yellow are facing the correct way. If you have colored materials on your object it may be tough to tell, but if you select your object, then switch to polygon select mode, polygons that are more blue are reversed. It is best to fix in c4d for best results. You can use the Draw Backfaces option to force Element to render those reversed polygons, and use the Auto Normals options and that can help a bit. However even with those fixes, the lighting on the model still may not react quite as desired. shadows are subjectively nicer and there are fewer issues with aliasing and noise. If normals are flipped the incorrect way, geometry in Element will appear to be invisible. The main advantage of the CINEMA 4D renderer is that it is CPU-based. There are two important reasons why you want all normals on an object to be pointing the correct way. Normals determine which way geometry faces react to light.
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