getGeometryInstanceAttributes is not a function - Error

CesiumJS
1

1. A concise explanation of the problem you’re experiencing.

Hi everyone,

I have an issue with using “getGeometryInstanceAttributes”.
When I try to use getGeometryInstanceAttributes, I get an error that "getGeometryInstanceAttributes is not a function "
This a part of the code:

var load = function(viewer, callback) {
…
var cubes;
req.onload = function(evt) {
…
that.primitive = new Cesium.PrimitiveCollection({show:true, destroyPrimitives:true});
…
that.primitive.add(…);
viewer.scene.primitives.add(that.primitive);
callback(viewer, that.primitive , this.number_cube);

}

function callBackFunc (viewer, myPrimitive, cubes) {
…
var i = 0;
var color = myPrimitive.getGeometryInstanceAttributes(i).color; // ERROR: myPrimitive.getGeometryInstanceAttributes is not a function
color[3] = (Math.cos(counter) * 0.5 + 0.5) * 255;
myPrimitive.getGeometryInstanceAttributes(i).color = color;
});

}
I really appreciate your help.

2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

4. The Cesium version you’re using, your operating system and browser.

2

Hey Maryam,

Notice that a PrimitiveCollection (https://cesiumjs.org/Cesium/Build/Documentation/PrimitiveCollection.html) is not the same as a Primitive (https://cesiumjs.org/Cesium/Build/Documentation/Primitive.html). A Primitive has a method getGeometryInstanceAttributes while PrimitiveCollection does not.

When you add a primitive, it returns the primitive that was added (see https://cesiumjs.org/Cesium/Build/Documentation/PrimitiveCollection.html#add). So you should call getGeometryInstanceAttributes on that instead.

Does that make sense?