Is it possible? Yes.
Will you have good performance? Most likely not. @AqeeAqee, the creator of the wonderful ray casting extension, already said that rendering a floor and ceiling is a big performance hit already.
Is it possible? Yes.
Will you have good performance? Most likely not. @AqeeAqee, the creator of the wonderful ray casting extension, already said that rendering a floor and ceiling is a big performance hit already.