projection sketch up

Please click on the images for a closer look.
As you can see, this is a first attempt at using google sketch up. Nice and simple to use but unfortunately I don't have enough time to learn it before I have to submit this. here is an aerial shot of the IDEAL space i would use for a projection work. Long white wall, and easy access to walk straight through without noticing the work if that should happen, as well as enough space to interact with it. The projector is up high in the centre of the room, pointing down low so that people can walk in front of it and still see the projected image when the light source is OFF. When it is ON they will only be able to see red text, illustrated in the images below.
I found it VERY hard to get a light source coming from a spotlight so had to improvise and use the default sunlight setting, and cut a long hole in the bottom of the wall to let the light in. As you can see here, Sang is poking through the roof getting too excited and shillouette man rotates with the view and is annoying. The shadows from the people passing through are cast onto the wall where previously light was shining on some lovely red lettering cut out of vinyl and stuck to the wall.

In this image you can see the white text in the projection has been revealed by the shadows, making full sentences from the words in red that were previously the only thing visible on the wall. So in the ideal situation in this ideal room of wonder the room would not be dark at all like this image, the only shadows would be those cast by the people in the room.

The light source where the hole in the wall is would have to be very strong, and very precise. It could possibly be another projector showing just white light so that then it would match exactly the dimensions of the wall with no light bleeding out the sides.