Which is better area light or mesh light?
Mesh lights are more flexible and probably more accurate, but require some understanding of importance sampling and playing around. All these tests were done with the Path Tracing integrator.
How does an emissive polygon work in Blender?
For an emissive polygon (mesh light), a hit “counts” if it intersects the mesh. For an area lamp, a hit “counts” if it passes through the rectangular area around the lamp’s center. This area is configurable, in Blender. Incidentally, point lamps work the same way, except that the area around the lamp’s center is spherical.
What’s the difference between an emissive polygon and an area light?
Both an area light and an emissive polygon can be used to create lights. What is the difference between the two? Matt’s answer covers the theory of it, but to provide a visual comparison: Area lamp, 100 samples, 11.08 seconds. MIS (Multiple Importance Sample) on Plane, 100 samples, 12.10 seconds. MIS on
How does a light emitting diode ( LED ) work?
A light-emitting diode ( LED) is a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons.
What kind of units does the cycles emission strength use?
Different light sources have different efficacy levels and a 15W LED can output the same luminous flux as a 95W tungsten incandescent bulb. The unit is Irradiance – radiant flux emitted by a surface per unit area ( watt per square meter ).
Which is faster area lamp or global illumination?
You can accomplish a similar effect (as in Cycles) with an emissive material on a mesh and using global illumination, but BI makes that extremely expensive to render. Area lamps (in BI) are orders of magnitude faster than global illumination, and probably just as accurate (if ray-traced).