I have developed an Object to terrain script (obviously) and I wanted to share it with you guys. The purpose of the Object to terrain script is to make a selected model with a mesh into the terrain. It is in Javascript.
Code:
@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", "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");
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);
}
}