Try loading your model with flat textures: Color: 127, 127, 127, 255 Normal: 127, 127, 255 Mask1: 0,0,0,0 Mask2: 127,0,0,127 Check if there are some bugs. if no replace flat normalmap with your file and see if there are no bugs. There is a possibility that you have something wrong with your vertex normals. If you use…