Pilchard123 wrote:So is a wider or narrower curve better in this case? I've seen a few of these graphs around and don't really get what they are showing. How does the x-coordinate of a pixel affect the light intensity there? At least, how does it it affect it in such a way to produce a graph that looks kind of like a normal distribution?
The wider blue curve is perfect. This graph just shows the single line of pixels from the center of the image below:
The point is that for the setup there is an analytic solution and one can compare it to the output of the luxrender.