Different Ways To Render

#1 You don't really need to modify the renderer to get things bright and cartoony. A game's look and feel It's 90% art and 10% code. I don't think Marble Blast modified the Torque renderer too much (aside from implementing stencil shadows and interior normal smoothing).

Just make things bright: use brighter colors and increase the lighting intensity.

If you wish to go beyond texture color and get overbright effects, there is the Lighting Pack. But I think that using it can actually move you away from cartoony visuals, since the overbright effects create a more realisitc feel.

Now, if you really want to push it into advanced non-photorealistc rendering, then you'll need to do some surgery on TGE to add whatever effects you intend using to get the results you want. It isn't that hard to modify how 3Space shapes are rendered (look at the material related functions in the TS source files), but I'm not sure about interiors and the terrain.

#2 Thanks for the help Manoel. I made everything more bright and intense and now it looks good.