Strictly speaking, it is wrong for light to pass through yellow glass + blue glass = green light.
Because the three primary colors of light are red, green and blue, yellow glass absorbs blue through red and green, and blue glass absorbs red and green through blue, so no light will pass through in the end.
Do an experiment below. It's hard to find all kinds of glass, so I replaced it with C4D (funny). Using Physical Renderer, Spotlight Settings Projection: Shadow Maps (Soft Shadows), Visible Lights: Forward Volumetric. The glass has a slightly frosted glass effect for easy viewing of the color.
Pure blue glass + pure green glass cannot transmit any light.
In reality, however, glass does not necessarily completely absorb all primary colors of light.
Let's try it with yellow glass + glass that looks blue.
It really does have green light!
The blue glass here looks like this, the yellow glass covers B and RG, and the "blue" glass covers R and only G is left. No problem.
Some will ask: Isn't that what the blue glass in the movie is like?
In fact, as long as it can pass through a little G, there is no problem. The picture below called blue glass should have no objection.
Just a few more pictures
In fact, the continuous transmission of light through two pieces of glass is to see that the light will not be blocked. In the above picture, the two light sources of the two pieces of glass are the addition of light.
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