![]() ![]() What we’re going to do is take two shots. As a warning, halogen lamps get pretty hot, so my polarizer has melted and warped a bit. I attached the polarizer with electrical tape because I’m a classy guy. The light is just a halogen lamp from Ikea, but with a linear polarizer in front of it. If you have to touch the camera to take multiple shots, I guarantee you will have misalignment. That way I can take multiple shots without touching the camera. Make sure the color profile is sRGB instead of Adobe 98Īlso, you see that I have a remote shutter release.I have a camera with everything set to full manual mode. Since diffuse light is retransmitted in random directions with random polarization, we can say that it is unpolarized. Additionally, specular light retains its incoming polarization but diffuse light does not. You can learn more about it from your good friend wikipedia. The cool thing is that light can be polarized. If we have a white light and a blue surface, this outgoing light will be blue. Some other light will be absorbed by the surface, some electrons will get excited, and a new photon will be emitted in a random direction. ![]() If we have a white light and a blue surface, the light will remain white. Some of the light that hits the surface will skip off the edge. By the way, this model is a huge over-simplification. Here is some light hitting a surface with a nearby camera. Make sure you get a linear polarizer, not a circular polarizer.Īt the most basic level, in computer graphics we assume that objects have both diffuse and specular reflectance. You want the “Fully Laminated Linear Polarizer Sheets”. A remote shutter control so you can take multiple shots without touching the camera.A camera that lets you shoot in manual mode.If you want to do this yourself, you are going to need: Btw, I’m not the expert here, but this is how I understand it. In the title image, the left is the diffuse light only, the middle is diffuse and specular light, and the right is specular light only. Artists spend lots of time looking at photo reference, but splitting the specular and diffuse really helps you understand a material. One thing I’ve got set up at home is the ability to use polarized light to split out the diffuse and specular components from real images. File this under things that people think is harder than it actually is. ![]()
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