Shaders created in Vuforia Studio are not working on Hololens, but on mobile (both IOS and Android).

From my testing shaders don't work at all on the HoloLens.  I've put shaders in mobile experiences that work fine, but when I try them on the HoloLens, nothing happens.

There are things that are available for mobile that aren't on HoloLens e.g. the new option for casting shadows.  A while ago, HoloLens experiences couldn't display textures, but that did get fixed. 

There are 2 specific  things where we have to pay attention on the HoloLens. 

1.) is to call all functions calls  when the models are alreday loaded. This means it is recommended to call all shaders from a modelload event - example:

$rootScope.$on('modelLoaded', function() { 
$scope.view.wdg['modelItem-1']['shader'] = "xray;";
$scope.view.wdg['modelItem-1']['shader'] = "";

 $scope.render_status=0;
setInterval(function() {

 $scope.$apply(function () {
 if($scope.render_status==0)
 {$scope.render_status=1
 $scope.setWidgetProp('modelItem-1', 'shader', 'xray;');
 $scope.setWidgetProp('modelItem-2', 'shader', 'Default;');
 
 // $scope.view.wdg['modelItem-1']['shader'] = "xray;";
 // $scope.view.wdg['modelItem-2']['shader'] = "";

 }
 else
 {$scope.render_status=0
 $scope.setWidgetProp('modelItem-1', 'shader', 'Default;');
 $scope.setWidgetProp('modelItem-2', 'shader', 'xray;'); 
 } 
 }
 );
}
 , 1500);

2.) the other point to use setWidgetProp method - instead of the statement:

$scope.view.wdg['modelItem-1']['shader'] = "xray;";
 //use this 
$scope.setWidgetProp('modelItem-1', 'shader', 'xray;');

 For static shaders this seem to work fine on the HoloLens

Here is  an example for the xray shader where I tested it successfully . The example code will change ever 1.5 seconds in an interval function the shader display of modelitems (from shader xray to default and vice versa)  To use it we have to create a TML text widget and paste the shader devinition on it.

Here the shader definition I used for the test (example from dev team)

<script name="xray" type="x-shader/x-fragment">
 precision mediump float;

 varying vec3 I;
 varying vec3 N;

 const float edgeFalloff = 1.0;
 const float intensity = 1.0;
 const float ambient = 0.2;

 void main() {
 vec4 color = vec4(1.0);
 float opacity = abs(dot(normalize(-N), normalize(-I)));
 opacity = ambient + intensity*(1.0-pow(opacity,edgeFalloff));
 gl_FragColor = opacity * color;
 gl_FragColor.a = opacity;
 }
</script>

<script name="xray" type="x-shader/x-vertex">
 attribute vec3 vertexPosition;
 attribute vec3 vertexNormal;

 varying vec3 I;
 varying vec3 N;

 uniform mat4 modelViewProjectionMatrix;
 uniform mat4 modelViewMatrix;
 uniform mat4 normalMatrix;

 void main() {
 vec4 vp4 = vec4(vertexPosition,1.0);
 vec4 P = modelViewMatrix * vp4;
 I = P.xyz - vec3(0);
 N = vec3(normalMatrix * vec4(vertexNormal,0.0));
 gl_Position = modelViewProjectionMatrix * vp4;
 }
</script>

So it seems that shaders will work on the HoloLens in generally and in your case we have some specific problem which needs first to be indetified.

So reported issue to PTC Development Team. 

Answer:

OpenGL   is not supported on the HoloLens.

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Could you please upload a brief video clip (screen recording) showing this in action? I'm not sure I understand what it looks like, but it sounds clever. I too am trying to show oil flow through tubes and cavities within a pump.