If the shine is coming from a glass door or window... the first thing you need to do is black that window and shoot from whatever angle you need in order to not show a blackened window.
There's a material that flags and full stop butterflies are made of... called duvetyne... we black doors and windows from the outside of a house when practical, and from the inside when we must.
The other option, depending on the cam angle, is to just flag off the offending reflection.
Finally, light the shot from angles that don't cause the shine while blocking the actors to work with the new lighting setup.
Try a polarizing filter on the camera lens. Rotate it to find the best postion to reduce the shine. This might work well and help along with the other suggestions.
I think Capt Quirk is talking perhaps, about Dulling spray. There are others as well, but I don't think you should spray the floor where people may be walking. The effect may soften the reflection, but it won't totally get rid of it.
It can work wonders , but it also depends on the lights angle , camera angle and source.
A different camera angle perhaps... How 'bout a rug ? If you don't want to cover the window entirely, as mentioned above, you could knock it down a bit by gelling the window with ND 9 and finding some tree branches to filter the light through (Brancholoris)
Makes a nice pattern .. Good Luck.
The polarizing filter is a good idea if you're at an angle that works... but also don't forget that you'll lose probably at least 1 stop... and on a DVX you don't usually have that much light to lose indoors.
Choose your battles... go with one of the practical solutions.
I've never seen somebody use dulling spray to knock the shine off of a huge area like a floor... I like the area rug idea.
If this problem isn't from a window or door... like let's say it's from a chandelier and the problem is 360 around your shot... then I'd consider an alternate angle or alternate location. Challenges like that are best prevented, rather then cured, by good location scouting and blocking the action.
My latest craze is black... with sound the first thing you do is eliminate unwanted sound through practical means, all the way up to mic selection... with lighting a set it's the same thing... eliminate all unwanted light through practical means. No matter what we're shooting... unless it's night... we black almost everything as we're setting up lights, so that when the last light is on the room would have been dark without it.
If it's a daylight shot and we know it's going to be a quick take then we might use kino daylight and/or hmi... but this is usually rare... more often then not we black out the light we can't control... such as glare and daylight (that changes quicker then you think).
If you don't have a polarizing filter for your camera and you're not sure this is the solution, try to find some true polarized sunglasses and look thru them at the floor. Rotate them and see if the glare is reduced an amount you like. If this works then the polarizing filter will work too.
Most sunglasses are not polarized so make sure you are testing with some that truly are. Polarized sunglasses and filters make a dramatic difference on shiny flat surfaces, like floors, water, roadways.
Thanks to everyone who replied with a great number of options and suggestions. We undertook a test run today and it turns out that with the right lighting the reflection from the floor is not going to be a problem.