unity3d中将模型转变为地型的代码

[复制链接]

晃晃

1023 主题	3 听众	359 积分

设计实习生

Rank: 2

纳金币: 335582
精华: 0

电梯直达

楼主

发表于 2011-8-12 10:48:29 |只看该作者 |倒序浏览

将模型转为地型的代码：

Object to Terrain.js

@MenuItem ("Terrain/Object to Terrain")

static function Object2Terrain () {

// See if a valid object is selected

var obj = Selection.activeObject as GameObject;

if (obj == null) {

EditorUtility.DisplayDialog("No object selected", "

lease select an object.", "Cancel");

return;

}

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);

}

}