After extensive research, I’ve come to the conclusion that it’s impossible to maintain bump mapping when using lightmapping on iOS.
Take a look at these two race tracks…
This is how it looks on PC/Mac in the editor…
This is roughly how it looks on an iPad 4…
I’ve tried using dual lightmaps, etc so the lightmapping retains the normal mapping, and I even got somebody to bake the normals into the textures for me in 3DS Max, but then they had to use the legacy lightmap shaders (which don’t look that great, and don’t support any realtime shadows which I will need for my trucks)
Can anyone suggest how else I can get the look I want on the iPad?
I’ve only had success with normal mapping using Directional (RNM) lightmaps on iOS.
You may get better results with specular + bump, diffuse bumps don’t seem to come out as well on iOS devices as they do on desktop. If you do use Directional mapping you’ll probably find you have to either use the regular spec+bump or create your own (the mobile shaders don’t work with RNM), and they can be a little unpredictable, so keep an eye out of kinks and glitches in the reflections.
