void Awake()
{
mesh = GetComponent <MeshFilter>().mesh;
atlas = FindObjectOfType(typeof(SpriteAtlas)) as SpriteAtlas;
mesh.uv = atlas.GetUVs(spriteID, 0);
}
void UpdateSprite()
{
var cam = Camera.main.transform;
var masterTransform = transform;
if (parentSprite != null)
{
masterTransform = parentSprite;
}
var dudeVec = Flatten(masterTransform.parent.forward);
var camVec = Flatten(cam.forward);
float orient = Vector3.Dot(dudeVec, camVec);
// -1 dot is behind (frame 0)
// 1 dot is in front (frame 3)
int frameID = 0;
if (orient >= 0.5f)
{
frameID = 3;
}
else if (orient <= -0.5f)
{
frameID = 1;
}
else
{
var rightVec = Flatten(masterTransform.parent.right);
if (Vector3.Dot(rightVec, camVec) > 0.0f)
{
frameID = 2;
}
else
{
frameID = 0;
}
}
if (frameID != lastFrameID)
{
mesh.uv = atlas.GetUVs(spriteID, frameID);
lastFrameID = frameID;
}
if (parentSprite == null)
{
transform.rotation = cam.rotation;
}
}