How to animate update a primitive height

CesiumJS
1

i use polygonGeomtry create a water polygon
how to animate update this polygon height
set modelMatrix can set it height
but can not animate

2

@pooii2006

Welcome to the community :confetti_ball:

What is your use case for this project? Also, could you please share a sandcastle demo of what you have so far? This information will help me give you the best possible support :smiley:

Best,
Sam

3

let _primitive = cesiumViewer.scene.primitives.add(

      new Cesium.Primitive({

        geometryInstances: new Cesium.GeometryInstance({

          geometry: new Cesium.PolygonGeometry({

            polygonHierarchy: new Cesium.PolygonHierarchy(_position4),

            vertexFormat: Cesium.EllipsoidSurfaceAppearance.VERTEX_FORMAT,

            height: 0.1,

          }),

          id: "water",

        }),

        appearance: new Cesium.EllipsoidSurfaceAppearance({

          aboveGround: false,

        }),

        releaseGeometryInstances: false,

      })

    );

let waterMaterail = new Cesium.Material({

      fabric: {

        type: "Water",

        uniforms: {

          normalMap: "./assets/model/shuizha/waterNormals.jpg", //法线纹理图片

          frequency: 10000.0,

          animationSpeed: 0.01,

          amplitude: 6.0,

          specularIntensity: 0.8,

          baseWaterColor: new Cesium.Color(0, 106 / 255, 180 / 255, 0.6),

          blendColor: new Cesium.Color(0, 106 / 255, 180 / 255, 0.6),

        },

      },

    });

_primitive.appearance.material = waterMaterail;
let _height = 0.1
let _interval = setInterval(()=>{
_height += 0.1;
if(_height>3){
clearInterval(_interval);
return;
}
_primitive.geometryInstances.geometry._height = _height;
_primitive.update()
},300)
now I want to use setInterval update _primitive height
so I can get a animate result
but set _primitive height and use _primitive.update() will get a develop error
because update function can not directly call

4

@pooii2006

Thank you very much for sending over this code! Unfortunately, I am having trouble running it on my end. Are you sure that there isn’t any code missing? Sharing a sandcastle demo might be our best option for moving forward. You can create on here:

What exact error are you receiving? Looking forward to hearing back from you!

-Sam