A few days ago I had the idea to write a program which can render the result of n-slit experiments (I learned about the experiment at school). I was able to find a formula for the intensity:$I_G(N,\gamma,x)=\frac{1}{N^2}*(\frac{sin(\gamma*\pi*x)}{\gamma*pi*x})^2*(\frac{sin(N*\pi*x)}{sin(\pi*x)})^2$ with $x=\frac{d*sin(\alpha)}{\lambda}$ and $\gamma=\frac{a}{d}$ ($N$ being the slit count, $d$ the grating spacing, $a$ the slit width, $\lambda$ the wavelength and $\alpha$ the angle; found in the german paper "Beugung am Spalt" by Institut für Angewandte Physik, Technische Universität Hamburg).
Unfortunately I could not find any photos of the interference pattern of n-slit experiments with visible light using its full spectrum besides this one:
(source: "The Original Double Slit Experiment" by Veritasium on YouTube)
My question is the following: How do the interference patterns of n-slits (primarily 1-3 slits) with visible light actually look? My renderings look like the following but I have no idea whether they are correct in any way: The interference patterns for 1 and 2 slits looks like a lot of the photos of interference pattern with monochromatic light sources and the one with 2 slits looks similar to the one by Veritasium but I have no idea whether the renderings with 1, 3 and 4 slits even closely resemble the reality (I know that the color addition in the rendering is not perfect at the moment):
(Own rendering of 1 to 4-slit interference patterns, from top to bottom)