Fragment shader translation failed.
VM257:1 An error occurred while rendering.  Rendering has stopped.
undefined
RuntimeError: Fragment shader failed to compile.  Compile log: ERROR: 0:650: 'realNormal' : undeclared identifier
WARNING: 0:650: 'normalize' : operation result is undefined for the values passed in
ERROR: 0:650: 'z' :  field selection requires structure or vector on left hand side
ERROR: 0:665: 'realNormal' : undeclared identifier
ERROR: 0:665: 'ComputeSlopeArrowColor' : no matching overloaded function found
ERROR: 0:665: '=' : dimension mismatch
ERROR: 0:665: '=' : cannot convert from 'const mediump float' to 'highp 4-component vector of float'
ERROR: 0:670: 'realNormal' : undeclared identifier
ERROR: 0:670: 'ComputeSlopeArrowColor' : no matching overloaded function found
ERROR: 0:670: '=' : dimension mismatch
ERROR: 0:670: '=' : cannot convert from 'const mediump float' to 'highp 4-component vector of float'