How to achieve this kind of white room environment scene in The Matrix? That can also cast shadows on the floor. 

iClone 7 can do this (with the new shadow catching material that's invisible otherwise).

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Alienware Aurora R12, Win 10, i9-119000KF, 3.5GHz CPU, 128GB RAM, RTX 3090 (24GB), Samsung 960 Pro 4TB M-2 SSD, TB+ Disk space
Mike "ex-genius" Kelley

So it's impossible for iClone 6?

Why not just use a white floor prop and a white bg color?  Should look pretty seamless.

You can use the default prop to make a cyclorama like we do in the real life !! 

I manage to do it! But I need to adjust the 'Self Illumination' to 30 of those 2 objects (blue & red) so that it'll match the exact color, it seems the color is not right with the default Self Illumination values.
Or maybe my lighting values aren't right.

I used the Universal Sky and change the diffuse texture to a plain white image as well as the Floor





Btw, thanks for the replies guys! =)