I sold the rights to Sphere Racer and Terrain Shader
You have the choice:
Either take the risk and go for royalties, if it doesn't sell well you make bugger all money.
Or
Take the lump sum, if it doesn't sell well you've still got your fee. If it sells well then the risk the publisher took giving you a lump sum outright pays off for them.
Or
You take a halfway house option of taking a smaller lump sum for a smaller cut of the profits.
You have the choice:
Either take the risk and go for royalties, if it doesn't sell well you make bugger all money.
Or
Take the lump sum, if it doesn't sell well you've still got your fee. If it sells well then the risk the publisher took giving you a lump sum outright pays off for them.
Or
You take a halfway house option of taking a smaller lump sum for a smaller cut of the profits.