Create multiple PolylineVolumeGeometry failed!

[zhhwdev]

 var data = [
                {
                    _x1:120.37642905547698,
                    _y1:36.061823371641786,
                    _x2:120.37655731228237,
                    _y2:36.06155499305445
                },
                {
                    _x1:120.37655731228237,
                    _y1:36.06155499305445,
                    _x2:120.37679825061254,
                    _y2:36.06124201467066
                },
                {
                    _x1:120.37679825061254,
                    _y1:36.06124201467066,
                    _x2:120.37683543475069,
                    _y2:36.061192772612785
                },
                {
                    _x1:120.37683543475069,
                    _y1:36.061192772612785,
                    _x2:120.37697942800656,
                    _y2:36.06101208937304
                },
                {
                    _x1:120.37697942800656,
                    _y1:36.06101208937304,
                    _x2:120.37707935869126,
                    _y2:36.06090563235622
                },
                {
                    _x1:120.37707935869126,
                    _y1:36.06090563235622,
                    _x2:120.37709460455717,
                    _y2:36.06080494389364
                }
            ];
            var lines = [];
            for (var i=0; i<data.length; i++){
                var x1 = (data[i]._x1) * 1;
                var y1 = (data[i]._y1) * 1;
                var x2 = (data[i]._x2) * 1;
                var y2 = (data[i]._y2) * 1;

                var tube = new Cesium.GeometryInstance({
                    geometry: new Cesium.PolylineVolumeGeometry({
                        polylinePositions: Cesium.Cartesian3.fromDegreesArray([
                            x1, y1,
                            x2, y2
                        ]),
                        vertexFormat: Cesium.PerInstanceColorAppearance.VERTEX_FORMAT,
                        shapePositions: computeCircle(3.0)
                    }),
                    attributes: {
                        color: Cesium.ColorGeometryInstanceAttribute.fromColor(Cesium.Color.RED)
                    }
                });

                lines.push(tube);
            }

           that.scene.primitives.add(new Cesium.Primitive({
                    geometryInstances: lines,
                    appearance: new Cesium.PerInstanceColorAppearance({
                        translucent: false,
                        closed: false
                    })
                }));

if the array( data ) has more than three element, He had a mistake when i run the app:

An error occurred while rendering. Rendering has stopped.
TypeError: e is undefined i.subtract@http://localhost:8080/Cesium/Workers/createGeometry.js:58:6239 z.computePositions@http://localhost:8080/Cesium/Workers/createPolylineVolumeGeometry.js:230:3462 x.createGeometry@http://localhost:8080/Cesium/Workers/createPolylineVolumeGeometry.js:230:8212 r@http://localhost:8080/Cesium/Workers/createPolylineVolumeGeometry.js:230:8464 i@http://localhost:8080/Cesium/Workers/createGeometry.js:61:27886 n/<@http://localhost:8080/Cesium/Workers/createGeometry.js:61:27187

I do not know whether it is a bug!

thank you!

[mramato]

Please us the forum for help before filing a bug. In your code above, Cesium.Cartesian3.fromDegreesArray expects multiples of 3 (i.e. your array needs [x, y, z, x1, y1, z1], you only specify 4 values.

[GatorScott]

Error in example in documentation for Cartesian3.fromDegreesArray shows 4 values in array: [-115.0, 37.0, -107.0, 33.0].

[mramato]

Actually, I was mistaken and my initial comment is wrong. fromDegreesArray does take pairs because height is ignored; it's fromDegreesArrayHeights that takes triplets. My apologies.

Actually running the code shows this is a duplicate of #2375, which @bagnell is currently working on.

[zhhwdev]

I hava find the problem. Because some points is too close. I should increase the tolerance in the code. thanks.