I select 'Plane 1' as the floor, offset = 0, but the shadow is not on display on the 'Plane 1', there was an offset. It is so strange.
Please help me to solve this problem.
Thank you so much!
I get this every now & then on certain parts or assemblies, not sure what causes it. If you press the "Offset to Geometry" button at the bottom of your screen shot, SolidWorks will automatically bring the floor up until it touches the nearest piece of geometry. You can also insert plus or minus dimensions in the box above the button to move it up or down (or drag the wheel) or you can drag the arrows in the graphics window at the bottom of your sphere.
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