4 ms·
When you shoot a ray from camera perspective, you've already chosen which pixel it's going to contribute to. "Platonic" pixels are infinitesimally small. In re
by m1el 7y ago
When you shoot a ray from camera perspective, you've already chosen which pixel it's going to contribute to. "Platonic" pixels are infinitesimally small.
In reality, pixels on the screen and camera sensor have an area. If you choose a random position on that area, you get anti-aliasing "for free" because there's going to be variation in the direction of rays that contribute to the same pixel.
- chongli 7y agoYou actually don’t get anti-aliasing for free on camera sensors. Many cameras put a low-pass filter in front of the sensor specifically to avoid the problem of aliasing. More recently, high-end cameras have been omitting the filter in order to improve resolution. This occasionally does result in aliasing (called moiré by photographers) when taking pictures of fine-structured repeating patterns, however.