How to reduce the time on Shader compiling at UDK startup on iphone?

[bluekylin]

My Game takes about 1:17 min to compiling shader:

[0006.63] Log: Starting shader compiling
[0083.90] Log: Shader compiling: 1:17 min

[dprat0821]

clear out unnecessary packages(.upk) and scripts(.u) will make it a little shorter, based on my practice.

[bluekylin]

Why we cannot completely do shader compiling on PC?

[Archerx]

Also why do you need so many different shaders? If you reuse shaders with a different textures it will save you on compiling time.

[bluekylin]

How to reuse shaders with a different textures? It seems like that we cannot use Material Instance on ios.

[XilenceX]

All materials that have the same setup only count as one shader to calculate. The time keeps increasing the more different combinations you have. So for example only diffuse... diffuse+alpha.... diffuse+normalmap+alpha... diffuse+normalmap are all different shader calculations. If all of these would have only diffuse there would be only one calculation on startup!!

[bluekylin]

Cool, I will try it!

[NickBullard]

Material Instance Constant (MIC) is supported on iOS, however they are limited just as materials are. If you are just wanting to swap out a diffuse, you can do this, but in every MIC you'll need to make sure you set your Mobile Parameter Groups as well as your created Parameters.

[bluekylin]

How to create MIC for mobile? just like as the PC?

[TechElv]

You can use MIC but you cannot change value of vector or scalar param on MIC.