【转】Unity3d个性化地形创建

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电梯直达

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发表于 2011-8-9 08:07:45 |只看该作者 |倒序浏览

一，在unity3d 的Project面板中新建一个文件夹，并为其命名为Editor。并在其文件夹下新建一个Javascript文件，命名为MountainsCreate.
二，把下面的代码拷贝到MountainsCreate.js上。
/*

*Use the tool.

*You can put 3D Max or maya model built into Unity3d in the mountains.

*/
@MenuItem ("Terrain/3DObject to Terrain")static function Object2Terrain ()

{

// See if a valid object is selected

var obj = Selection.activeObject as GameObject;

if (obj.GetComponent(MeshFilter) == null) {

EditorUtility.DisplayDialog("No mesh selected", "

lease select an object with a mesh.","Cancel");

  return;



}else if ((obj.GetComponent(MeshFilter) as MeshFilter).sharedMesh == null) {

  EditorUtility.DisplayDialog("No mesh selected", "

lease select an object with a valid mesh.", "Cancel");

return;

}

if (Terrain.activeTerrain == null) {

EditorUtility.DisplayDialog("No terrain found", "

lease make sure a terrain exists.","Cancel");

  return;

}

var terrain = Terrain.activeTerrain.terrainData;       // If there's no mesh collider, add one(and then remove it later when done)
var addedCollider = false;
var addedMesh = false;

var objCollider = obj.collider as MeshCollider;

if (objCollider == null) {

  objCollider = obj.AddComponent(MeshCollider);

  addedCollider = true;

}else if (objCollider.sharedMesh == null) {

  objCollider.sharedMesh = (obj.GetComponent(MeshFilter) as MeshFilter).sharedMesh;

  addedMesh = true;

}

Undo.RegisterUndo (terrain, "Object to Terrain");

var resolutionX = terrain.heightmapWidth;

var resolutionZ = terrain.heightmapHeight;

var heights = terrain.GetHeights(0, 0, resolutionX, resolutionZ);

// Use bounds a bit smaller than the actual object; otherwise raycasting tends to miss at the edges

var objectBounds = objCollider.bounds;

var leftEdge = objectBounds.center.x - objectBounds.extents.x + .01;

var bottomEdge = objectBounds.center.z - objectBounds.extents.z + .01;

var stepX = (objectBounds.size.x - .019) / resolutionX;

var stepZ = (objectBounds.size.z - .019) / resolutionZ;

// Set up raycast vars

var y = objectBounds.center.y + objectBounds.extents.y + .01;

var hit : RaycastHit; var ray = new Ray(Vector3.zero, -Vector3.up);

var rayDistance = objectBounds.size.y + .02;

var heightFactor = 1.0 / rayDistance;

// Do raycasting samples over the object to see what terrain heights should be

var z = bottomEdge;

for (zCount = 0; zCount < resolutionZ; zCount++) {

  var x = leftEdge;

  for (xCount = 0; xCount < resolutionX; xCount++) {

ray.origin = Vector3(x, y, z);

if (objCollider.Raycast(ray, hit, rayDistance)) {

heights[zCount, xCount] = 1.0 - (y - hit.point.y)*heightFactor;          }

else {

heights[zCount, xCount] = 0.0;

}

x += stepX;

  }

  z += stepZ;

}

terrain.SetHeights(0, 0, heights);

if (addedMesh) {

  objCollider.sharedMesh = null;

}

if (addedCollider) {

  DestroyImmediate(objCollider);

}

}
三，把从3D Max或Maya中制作的地形对象导入到Unity3d资源文件夹中。模型名为Mountains.
四，点击工具栏菜单中的Terrain--->Create Terrain,创建一个地形。
五，把导入的地形从Unity3D Project面板中拖放到Hierarchy面板中。在Hierarchy面板中选中Mountains对象，然后选中工具栏菜单中的
Terrain--->3DObject to Terrain.此时就能看到您自己导入的修改化地形了。