How to sum r+g+b values and convert it to int in the shader?
I think I start to have problems from 255.
Fixed this by changing the type of color to Rgba64.
The default is Color
Which is 32 bit and 8 bits per channel
If you use Rgba64, it'll be 64 bit and 16 bits per channel
So instead of 256 colors, it'll be 65535 colors.