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! =)

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

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

So it's impossible for iClone 6?

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

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Alienware Aurora R16, Win 11, i9-149000KF, 3.20GHz CPU, 64GB RAM, RTX 4090 (24GB), Samsung 870 Pro 8TB, Gen3 MVNe M-2 SSD, 4TBx2, 39" Alienware Widescreen Monitor
Mike "ex-genius" Kelley

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