New option under "Create" to "Generate Asteroid Belt"

首先定位现有的 BuildEntities 方法，以及 issue 中描述的 UI 入口 Create 和 Generate Asteroid Field。阅读当前小行星带如何收集参数并构建实体，然后定义带状区域对话框和坐标生成逻辑，使保存的世界在指定半径内包含所请求数量的小行星；验证所述的高数量警告。

I have been looking for a while on how to generate an asteroid belt in space engineers. After some research there was no good way to do this other then really generate all those asteroids. Whereas with your program it can already generate asteroid fields. It ook me some time as a junior software engineer to find the specific code in your source code which was generating the astroids.

As I understood The method "BuildEntities" will build all the entities created in the pop-up windows. which triggers on create button event.

I kindly ask if you would like to implement this feature where the only thing still needed to be done is a new pop-up window. Which differs from "generate asteroid field" it would require the following parameters: Center (x, y, z coordinates), Radius (the distant from the center where the belt will be created), amount of asteroid (I would recommend using your already written random generate astroid in a loop function to generate the amount of asteroid. this in turn will result in how dense the astroid belt will be.

public void BuildEntitiesBelt(out string[] sourceVoxelFiles, out MyObjectBuilder_EntityBase[] sourceEntities)
        {
            var entities = new List<MyObjectBuilder_EntityBase>();
            var sourceFiles = new List<string>();
			var AsteroidCount = VoxelCollection.Count;

            MainViewModel.ResetProgress(0, AsteroidCount);

            foreach (var voxelDesign in VoxelCollection)
            {
                MainViewModel.Progress++;
                if (string.IsNullOrEmpty(voxelDesign.VoxelFile.SourceFilename) || !MyVoxelMap.IsVoxelMapFile(voxelDesign.VoxelFile.SourceFilename))
                    continue;


                var asteroid = new MyVoxelMap();
                string tempSourcefilename = null;

                switch (AsteroidFillType)
                {
                    case Support.AsteroidFillType.None:
                        asteroid.Load(voxelDesign.VoxelFile.SourceFilename, voxelDesign.MainMaterial.Value, false);
                        tempSourcefilename = voxelDesign.VoxelFile.SourceFilename;
                        break;

                    case AsteroidFillType.ByteFiller:
                        asteroid.Load(voxelDesign.VoxelFile.SourceFilename, voxelDesign.MainMaterial.Value, false);
                        var filler = new AsteroidByteFiller();
                        filler.FillAsteroid(asteroid, voxelDesign);
                        tempSourcefilename = TempfileUtil.NewFilename(MyVoxelMap.V2FileExtension);
                        asteroid.Save(tempSourcefilename);
                        break;
                }


                // automatically number all files, and check for duplicate filenames.
                var filename = MainViewModel.CreateUniqueVoxelStorageName(voxelDesign.VoxelFile.Name + MyVoxelMap.V2FileExtension, entities.ToArray());

				Random random = new Random()
				
                var x = CenterPositionX + radius * Math.cos(2 * Math.PI * i / AsteroidCount);
                var y = CenterPositionY + radius * Math.sin(2 * Math.PI * i / AsteroidCount);
                var z = CenterPositionZ + random.Next(-4000, 4000);

				x+= random.Next(-2000, 2000);
				y+= random.Next(-2000, 2000);
				
                var center = new Vector3D(CenterPositionX, CenterPositionY, CenterPositionZ);
                var position = center + new Vector3D(x, y, z) - asteroid.BoundingContent.Center;
                var entity = new MyObjectBuilder_VoxelMap(position, filename)
                {
                    EntityId = SpaceEngineersApi.GenerateEntityId(IDType.ASTEROID),
                    PersistentFlags = MyPersistentEntityFlags2.CastShadows | MyPersistentEntityFlags2.InScene,
                    StorageName = Path.GetFileNameWithoutExtension(filename),
                    PositionAndOrientation = new MyPositionAndOrientation
                    {
                        Position = position,
                        Forward = Vector3.Forward, // Asteroids currently don't have any orientation.
                        Up = Vector3.Up
                    }
                };

                entities.Add(entity);
                sourceFiles.Add(tempSourcefilename);
            }

            sourceVoxelFiles = sourceFiles.ToArray();
            sourceEntities = entities.ToArray();
        }

This code is almost an exact copy of yours but with some slight changes in how the coordinates are calculated. It's up to you if you want two sperate methods or just a simple if statement checking if you are generating asteroid field or belt.

I haven't created a pop-up yet. If you don't have time I will try to make it myself. but as I said I'm still learning to code.

Hope this will help the community as some people are looking to generate an asteroid belt which this will be able to do.

If I missed anything thing or you would like some more information, I'm keen to hear from you!

Also let me know what you think of this feature!

Sidenote: put a warning that if you go a higher number then 10000 asteroid it will decrease load time of said save world.