I'm looking at ways of using Luxology to create reasonably accurate film or cinema type image projections to study cinema wall and floor finishes. I'm using spot lights and transparent image slides, but it does not seem possible to create in-focus projections at realistic distances. I need to be able to calibrate light output in lumens or similar to check that my estimates are reasonable.
Alternatively, can anyone give suggestions on using glow materials or area lights to simulate rear-projection screens? Again, I would need some way of calibrating the simulated brightness.
If anyone has tried this before, or has any advice, please let me know.
If you have the latest Visualization update beta you can attach an image to a light i.e. your spotlight and this will project that image in the direction of the light. The colour picker for the light colour now has a drop down combo box associated with it. Thats where you will see the option to choose an image map.
Check out the suggestion from Roger Knights in the Spotlights to project rectangular, e.g. 4:3 proportioned beams? thread (not sure how I started a separate thread, I meant to reply to this one!).
Thanks for the responses guys.
Yes, you can mask the spotlight to project a beam, but this doesn't fix the focus issue.
I'll try attaching images to the light source - that's a neat idea. I'm using V8i Ver. 08.11.07.171,which doesn't seem to allow me to attach images to the light source.
As far as using a glow map, I don't think you can calibrate the output in terms of photometric units (lumens, etc).
Like the man say, if you get the latest update you can apply image maps to spotlights. This is brilliant news.
So for your rectanglar spotlight, you just need to create a mask with a white rectangle inside a circular area that fits within the square image file. If that makes sense.
Basically, the spotlight stretches the square image file to fill the cirular spotlight so you need to fit your rectangular gobo within that circle.
Ooh, volumetric effects also respect the spotlight image map. Exciting stuff.