Unity虚拟天文馆

12万颗星，用了gpu instancing以后帧率还行
效果图：（猎户座和昴星团）

3d模式可以在星海*视角转悠

星星类

struct Star
    {
        public Vector3 position;
        public float mag;
        public float abMag;
        public float colorIndex;
    }

ui部分

private void OnGUI()
    {
        if (showUI)
        {
            GUILayout.Label("H: Hide ui");
            UpdatePerFrame = GUILayout.Toggle(UpdatePerFrame, "Update Per Frame");
            
            if (!tDMode)//天文馆
            {
                GUILayout.Label("Size Multiplier:");
                sizeMultiplier = GUILayout.HorizontalSlider(sizeMultiplier, 0, 1);

                GUILayout.Label("Pow Damp:");
                powDamp = GUILayout.HorizontalSlider(powDamp, 0, 1000000);

            
                GUILayout.Label("Pow Multiplier:");
                powMultiplier = GUILayout.HorizontalSlider(powMultiplier, 0, 10f);

                GUILayout.Label("Distance Multiplier:");
                distanceMultiplier = GUILayout.HorizontalSlider(distanceMultiplier, 0, 100000);
            }

            else//3d
            {
                GUILayout.Label("Size Multiplier:");
                sizeMultiplier = GUILayout.HorizontalSlider(sizeMultiplier, 0, 50);

                GUILayout.Label("Distance Multiplier:");
                distanceMultiplier = GUILayout.HorizontalSlider(distanceMultiplier, 0, 1);

                GUILayout.Label("Speed:");
                moveSpeed = GUILayout.HorizontalSlider(moveSpeed, 0, 20000);
            }

            sun = GUILayout.Toggle(sun,"Sun");



            string mode = "3D Mode";
            if (tDMode == true)
                mode = "Flat Mode";
            if(GUILayout.Button(mode))
            {
                tDMode = !tDMode;
                

                if (tDMode)
                {
                    sizeMultiplier = 20f;
                    powMultiplier = 1f;
                    powDamp = 0.5f;
                    distanceMultiplier = 0.1f;

                    GetComponent<Camera>().clearFlags = CameraClearFlags.Color;
                        }
                else
                {
                    sizeMultiplier = 0.05f;
                    powMultiplier = 4.41f;
                    powDamp = 960f;
                    distanceMultiplier = 10000f;

                    GetComponent<Camera>().clearFlags = CameraClearFlags.Skybox;
                }

                transform.position = Vector3.zero;

                SetStars();
            }
        }
    }