     v_positionEC = (czm_modelView * vec4(position3DWC, 1.0)).xyz;
     v_positionMC = position3DWC;                                 // position in model coordinates
     v_textureCoordinates = textureCoordinates;
-    v_waterMask = waterMask;
 }

varying vec3 v_positionEC;

varying vec2 v_textureCoordinates;
varying float v_waterMask;

// These functions are generated at runtime.
vec4 getPosition(vec3 position3DWC);

attribute vec3 position3D;
attribute vec2 textureCoordinates;

uniform float u_morphTime;

