/// <summary>
/// We override the create world object function for a tree. This is done as we need to load in multiple
/// parts of the tree
/// </summary>
/// <param name="transform"></param>
/// <returns></returns>
public override WorldObject CreateWorldObject(Transform transform = null)
{
//Create random with seed unique to tree position - this ensures tree should be same every time.
GenerationRandom genRan = new GenerationRandom(WorldPosition.x * World.WorldSize * World.ChunkSize + WorldPosition.z);
int canopy = genRan.RandomInt(3, 7);
float angleOffset = genRan.Random(0, Mathf.PI);
float range = Mathf.Sqrt(canopy * 0.5f) * 0.8f;
WorldObject treeBase = WorldObject.CreateWorldObject(this, transform);
Vec2i zero = new Vec2i(0, 0);
Vector3[] canopyPositions = new Vector3[canopy];
for (int i = 0; i < canopy; i++)
{
//Define the positions of each canopy as roughly circular about the middle of the tree.
float angle = (Mathf.PI * 2 / (canopy)) * i + angleOffset;
Vector2 delta = new Vector2(Mathf.Cos(angle), Mathf.Sin(angle)) * range + genRan.RandomVector2(-0.1f, 0.1f);
float height = 1.8f + genRan.Random(0, 1f);
//Store the total position for use later, then generate the canopy itself.
canopyPositions[i] = new Vector3(delta.x, height, delta.y);
TreeCanopy tr = new TreeCanopy(zero, canopyPositions[i]);
tr.SetRandom(genRan);
tr.CreateWorldObject(treeBase.transform);
}
//Generate the trunk
float trunkHeight = 1.2f;
float trunkScale = 1.2f;
TreeBranch trunk = new TreeBranch(zero);
trunk.SetCharacteristic(Vector3.zero, new Vector3(0, 0, 0), new Vector3(1, trunkScale, 1));
WorldObject trunkObj = trunk.CreateWorldObject(treeBase.transform);
//MeshCollider mc =trunkObj.gameObject.AddComponent<MeshCollider>();
//mc.sharedMesh = trunkObj.gameObject.GetComponent<MeshFilter>().mesh;
Vector3 trunkTop = Vector3.up * trunkHeight * trunkScale; //Scale to correct height
foreach (Vector3 v in canopyPositions)
{
TreeBranch canopyBranch = new TreeBranch(zero);
//Calculate the Euler angles from the branch base to the canopy
Vector3 delta_pos = v - trunkTop;
Quaternion.FromToRotation(Vector3.up, delta_pos);
//Vector3 rot = Quaternion.FromToRotation(trunkTop, v*5f).eulerAngles;
Vector3 rot = Quaternion.FromToRotation(Vector3.up, delta_pos).eulerAngles;
float scale = Vector3.Distance(v, trunkTop) / trunkHeight;
canopyBranch.SetCharacteristic(trunkTop, rot, new Vector3(1 / scale, scale, 1 / scale));
canopyBranch.CreateWorldObject(treeBase.transform);
}
return(treeBase);
}
