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In a sense all (non-stylized) rendering is physics-based in the sense that all that physics is a model, and indeed the field of physics has different models of
by zokier 3y ago
In a sense all (non-stylized) rendering is physics-based in the sense that all that physics is a model, and indeed the field of physics has different models of differing accuracy/precision/applicability. So even pre-PBR could be called physical in the sense that it represents some sort model of light, the rest is more of question on degree of accuracy and applicability. What I'm aiming at is that the line drawn for PBR is drawn in sand and feels somewhat arbitrary.
- magicalhippo 3y agoIt's not that arbitrary to me. The earlier work was sometimes physically-motivated, and sometimes even based on physics. For example using Lambertian reflection[1] for diffuse surfaces. But the key, in my view, to PBR is that the whole pipeline is based on physical principles and math, while the old renderers were not. So previous renderers would not bother properly normalizing the Lambertian coeffients for example, leading to violation of energy conservation. [1]: https://en.wikipedia.org/wiki/Lambertian_reflectance https://en.wikipedia.org/wiki/Lambertian_reflectance