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Another Very Unsophisticated but simple method that worked for me, after finish your scene:

1. Duplicate the desired object

2. go to Object tab > Cycles setting > ray disability, check 'shadow' for one object and uncheck 'camera ray', do the opposite for the other.

3.flat one of the duplications to be plane, face the light source.

I did it to save render time.

Another Very Unsophisticated but simple method that worked for me, after finish your scene:

1. Duplicate the desired object

2. go to Object tab > Cycles setting > ray visability, check 'shadow' for one object and uncheck 'camera ray', do the opposite for the other.

3.flat one of the duplications (the 'shadow') to be plane, face the light source.

I did it in order to save render time.

Another Very Unsophisticated but simple method that worked for me, after finish your scene:

1. Duplicate the desired object
2. Go to Object Tab > Cycles setting > Ray Visibility, check Shadow for one object, uncheck for the other.
3. Flat one of the duplications to be a plane.

Another Very Unsophisticated but simple method that worked for me, after finish your scene:

1. Duplicate the desired object

2. go to Object tab > Cycles setting > ray disability, check 'shadow' for one object and uncheck 'camera ray', do the opposite for the other.

3.flat one of the duplications to be plane, face the light source.

I did it to save render time.

Another Very Unsophisticated but simple method worked for me, after finish your scene:

1. Duplicate the desired object
2. go to Object tab > Cycles setting > ray disability, check 'shadow' for one object, uncheck for the other. 3.flat one of the duplications to be plane.

Another Very Unsophisticated but simple method that worked for me, after finish your scene:

1. Duplicate the desired object
2. Go to Object Tab > Cycles setting > Ray Visibility, check Shadow for one object, uncheck for the other.
3. Flat one of the duplications to be a plane.