I use "u_time" parameter in my shader modifier but lack of "u_time" on IOS11 make fragment shader crash.
Why "u_time" not provided on IOS11
According to apple SCNShadable documentation, this parameter should be provided by scenekit.
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2017-07-29 12:04:44.617051+0300 miniRoad[1121:235964] [SceneKit] Error: failed to link program: ERROR: 0:485: Use of undeclared identifier 'u_time'
2017-07-29 12:04:44.617228+0300 miniRoad[1121:235964] [SceneKit] Error: program failed to build:
2017-07-29 12:04:44.617422+0300 miniRoad[1121:235964] [SceneKit] Error: C3DResourceManagerMakeProgramResident failed to compile program - fallback on default program