A style definition can be a character string like "shiny", already a parameter list, or a command like 'from_mesh' that tells us to get the style from the renderable. This function creates the final parameters from the definition and the renderable.
get.rglstyle.parameters(renderable, style)A renderable (or any list) which includes a 'style' key. If it does not include such a key, the 'default' style will be used.
A style definition. Can be a character string like 'shiny' or 'from_mesh', or already a named list of material properties (which will be returned as-is).
a style, resolved to a parameter list compatible with material3d.