UnityEditor.TreePainter.PlaceTrees C# (CSharp) Method

        public static void PlaceTrees(Terrain terrain, float xBase, float yBase)
        {
            int prototypeCount = TerrainInspectorUtil.GetPrototypeCount(terrain.terrainData);
            if (((selectedTree != -1) && (selectedTree < prototypeCount)) && TerrainInspectorUtil.PrototypeIsRenderable(terrain.terrainData, selectedTree))
            {
                int num2 = 0;
                TreeInstance instance = new TreeInstance {
                    position = new Vector3(xBase, 0f, yBase),
                    color = GetTreeColor(),
                    lightmapColor = Color.white,
                    prototypeIndex = selectedTree,
                    heightScale = GetTreeHeight()
                };
                instance.widthScale = !lockWidthToHeight ? GetTreeWidth() : instance.heightScale;
                instance.rotation = GetTreeRotation();
                if (((Event.current.type != EventType.MouseDrag) && (brushSize <= 1f)) || TerrainInspectorUtil.CheckTreeDistance(terrain.terrainData, instance.position, instance.prototypeIndex, spacing))
                {
                    terrain.AddTreeInstance(instance);
                    num2++;
                }
                Vector3 prototypeExtent = TerrainInspectorUtil.GetPrototypeExtent(terrain.terrainData, selectedTree);
                prototypeExtent.y = 0f;
                float num3 = brushSize / ((prototypeExtent.magnitude * spacing) * 0.5f);
                int num4 = (int) ((num3 * num3) * 0.5f);
                num4 = Mathf.Clamp(num4, 0, 100);
                for (int i = 1; (i < num4) && (num2 < num4); i++)
                {
                    Vector2 insideUnitCircle = Random.insideUnitCircle;
                    insideUnitCircle.x *= brushSize / terrain.terrainData.size.x;
                    insideUnitCircle.y *= brushSize / terrain.terrainData.size.z;
                    Vector3 position = new Vector3(xBase + insideUnitCircle.x, 0f, yBase + insideUnitCircle.y);
                    if ((((position.x >= 0f) && (position.x <= 1f)) && ((position.z >= 0f) && (position.z <= 1f))) && TerrainInspectorUtil.CheckTreeDistance(terrain.terrainData, position, selectedTree, spacing * 0.5f))
                    {
                        instance = new TreeInstance {
                            position = position,
                            color = GetTreeColor(),
                            lightmapColor = Color.white,
                            prototypeIndex = selectedTree,
                            heightScale = GetTreeHeight()
                        };
                        instance.widthScale = !lockWidthToHeight ? GetTreeWidth() : instance.heightScale;
                        instance.rotation = GetTreeRotation();
                        terrain.AddTreeInstance(instance);
                        num2++;
                    }
                }
            }
        }