{"id":517,"date":"2010-03-27T12:39:33","date_gmt":"2010-03-27T12:39:33","guid":{"rendered":""},"modified":"2013-02-27T12:22:23","modified_gmt":"2013-02-27T04:22:23","slug":"517","status":"publish","type":"post","link":"https:\/\/1vr.cn\/?p=517","title":{"rendered":"\u5c063D\u5efa\u6a21\u8f6f\u4ef6\u5efa\u7acb\u7684\u5730\u5f62\u5bfc\u5165Unity3D\u4e2d\u4f5c\u4e3a\u5730\u5f62."},"content":{"rendered":"

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\u5f53Terrain<\/strong>\u83dc\u5355\u4e0b\u51fa\u73b0Object to Terrain<\/strong>\u65f6,\u5728\u573a\u666f\u89c6\u56fe\u6216\u8005\u5c42\u6b21\u9762\u677f\u9009\u62e9\u4e00\u4e2a\u5bf9\u8c61,\u8fd9\u4e2a\u5bf9\u8c61\u5c06\u8f6c\u53d8\u5916\u9ad8\u5ea6\u56fe\u7528\u4e8e\u5730\u5f62.\u8fd9\u4e2a\u5bf9\u8c61\u5fc5\u987b\u5305\u542b\u7f51\u683c.\u5982\u56fe:

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\u4e0b\u9762\u4e3aObject2Terrain.js\u811a\u672c\u5185\u5bb9<\/p>\n

@MenuItem (\"Terrain\/Object to Terrain\")<\/p>\n

static function Object2Terrain () {
    \/\/ See if a valid object is selected
    var obj = Selection.activeObject as GameObject;
    if (obj == null) {
        EditorUtility.DisplayDialog(\"No object selected\", \"Please select an object.\", \"Cancel\");
        return;
    }
    if (obj.GetComponent(MeshFilter) == null) {
        EditorUtility.DisplayDialog(\"No mesh selected\", \"Please select an object with a mesh.\", \"Cancel\");
        return;
    }
    else if ((obj.GetComponent(MeshFilter) as MeshFilter).sharedMesh == null) {
        EditorUtility.DisplayDialog(\"No mesh selected\", \"Please select an object with a valid mesh.\", \"Cancel\");
        return;  
    }
    if (Terrain.activeTerrain == null) {
        EditorUtility.DisplayDialog(\"No terrain found\", \"Please 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\");<\/p>\n

    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);
    }
}
<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"

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