单位
| QUANTITY | RADIOMETRIC | PHOTOMETRIC |
|---|---|---|
| Power | W | Lumen (lm) = cd·sr |
| Power Per Unit Area | W/m² | Lux (lx) = cd·sr/m² = lm/m² |
| Power Per Unit Solid Angle | W/sr | Candela (cd) |
| Power Per Unit Area Per Unit Solid Angle | W/m²·sr | cd/m² = lm/m²·sr = nit |
I don’t know of any game engines where they attribute real-world units to lighting and material values, since those kinds of things tend to be driven more by the appearance than the physical correctness. The relative intensities of, say, a candle and a 100W light bulb are probably more important than the absolute values.Lighting: The Rendering Equation
- Radiometry, part 1: I got it backwards
- What units should I use for lighting in a 3D rendering engine?
- Moving Frostbite to Physically Based Rendering 2.0
- Physical Units for Lights
- Physical Lighting Units
- Filament lighting/units
- Understand physical light units
- Lighting: The Rendering Equation
- Using Physically Correct Brightness in Cycles, emission