Forum: Poser - OFFICIAL


Subject: How Light Probes are Laid Out

nerd opened this issue on Apr 04, 2005 ยท 58 posts


nerd posted Wed, 06 April 2005 at 1:24 PM Forum Moderator

I don't know about the Light probe for dummies, but it really isn't that hard. My ligbt probe rig is made from a 10" diameter glass gazing ball found at WalMart. I don't remember but I bet I paid less than $10 for it. (10 incehes is about 30 CM for the metric folks) The camera is nothing fancy either. A little 3MPX job from Olympus. I made the rig so the ball fills the frame at maximum zoom. I made a steel bar then turned a socket from aluminum to hold the base of the ball. It holds the ball kind of like a glass light cover, with 3 set screws. This is bolted to one end of the bar. The camera has a mount on the other end. There is a 1/4-20 thread to mount it at the balance point. But! a duct tape an bailing wire rig will produce the same image quality. I made mine robust because I'm planning a "photo saffari" and I don't want to be struggling with the home made light probe rig. The camera and ball both fasten to my 25 year old "Focal" brand (That's a K-mart blue light special) tripod. The image I'm shooting are not HDRI. A camera that can do HDRI will set you back a few grand. It doesn't matter because I don't think any format that Poser can read will actually still be HDRI. I think that's why the lower contrast values work better for IBL light setups. The really high contrast values (5+) would bring out the extra range in an HDR image. A standard range image seems to works better with the contrast lower, 1 to 3 range. The images don't really need to be that high of resolution, unless you are doing some fancy gather-fake mirror-of-the-sky type render. In my test I could see no diffrence between a 1000px probe and a 100px probe in the final render. Would a panoramic render in Vue get an image similar to what is discussed above? Does the panorama render encompass the 360 degree view of the "world"? Then I guess it would work. Nerd3D