I want to plot the Gaussian filter of pbrt-v4 with a radius $(100,100)$ and a standard deviation ($\sigma$) of $0.5$.
I would expect something like this:
When I plot the pbrt-v4 Gaussian filter with radius $(100,100)$ and $\sigma=0.5$ I get:
Is the 2nd plot correct? I varied the radius form $1$ to $1000$ but the the filter size changes only 2 pixels in total (I get a similar results). Any ideas? How does the correct plot look like?