# Artifact appears on polygon when viewed from a low angle

**URL:** <https://community.cesium.com/t/artifact-appears-on-polygon-when-viewed-from-a-low-angle/11797>\
**Category:** CesiumJS\
**Created:** [December 16, 2020, 8:25am UTC](https://community.cesium.com/t/artifact-appears-on-polygon-when-viewed-from-a-low-angle/11797 "2020-12-16T08:25:52Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![chaijinsong](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/chaijinsong/32/3693_2.png) [@chaijinsong](https://community.cesium.com/u/chaijinsong)\
**Post date:** [December 16, 2020, 8:25am UTC](https://community.cesium.com/t/artifact-appears-on-polygon-when-viewed-from-a-low-angle/11797/1 "2020-12-16T08:25:52Z")

</div>

![image](https://global.discourse-cdn.com/cesium/original/2X/0/0e18c2ba93b858c7472983adb0a9f7eee50455f0.jpeg)

 ![image](https://global.discourse-cdn.com/cesium/original/2X/6/626e45d65fcfbfd7ba2c12bd0067872228e4359d.jpeg)

angle of view is lower, the shadow will appear，i want the shadow disappear

this is code:

```auto
var viewer = new Cesium.Viewer("cesiumContainer");
viewer.scene.globe.enableLighting = false;
viewer.shadows = false;
var redPolygon = viewer.entities.add({
  name: "Red polygon on surface",
  polygon: {
    hierarchy: Cesium.Cartesian3.fromDegreesArrayHeights([
      116.31282326252641,
                            40.02362677720817,
                            -2.502101525,
      116.31980360345781,
                            40.02362677720817,
                            -2.502101525,
      116.31980360345781,
                            40.012985336043336,
                            -2.502101525,
      116.31282326252641,
                            40.012985336043336,
                            -2.502101525,
       116.31282326252641,
                            40.02362677720817,
                            -2.502101525
    ]),
    height: 1000,
    material: Cesium.Color.RED,
  },
});

viewer.zoomTo(viewer.entities); 

```