Pass size multiples/absolutes as part of procedural generation config

[honeybunches-of-oates]

No description provided.

[chengxuz]

The thing we decide to do now is providing three options to change the size of one object:

1. There would be a dictionary describing every object's option and size.

Option 1. Relative to a fixed unit length, universal across all scenes.

Option 2. Relative to the size of the room (specified as a fraction of the room)

Option 3. Relative to the object itself (just multiple of the native size).

In all the cases, we would change the longest axis of the object.

[chengxuz]

We might issue a warning or change the input scale if the object seems to be too large to fit in the room.

[chengxuz]

Just finished the Option 3 and committed the changes.
TODO:
README.md also needs to be changed to tell how to use this feature.
Other two options.
Warning about too large scale size.

[yamins81]

So let's implement option 1 and update the readme update now, and leave the other option 2 and the warning for later.

[chengxuz]

OK, option 1 and updating the readme has been finished.

[yamins81]

Closing, @chengxuz let me know if this issue should be reopened.

[chengxuz]

I am re-opening this issue, as there is one small bug here:

When the permitted list is empty, the current function can not scale the objects. (Thanks for @pbashivan for pointing it out!)

[chengxuz]

Bug fixed. Issue closed. Feel free to reopen it if needed.

[chengxuz]

Several other things to do:

1. Global option about whether adjusting size of every objects to 1 unit
2. Store size-related information at Mongodb and then make it possible for Unity to use it
   2.1 Size-related information should specify the source of this information (whether canonical size or arbitrary suggestions)
3. Have the possibility of varying size of instances for same prefabs, sampling from some distribution given by config (or Mongodb)
   3.1 And have the global option to enable it or not whether globally or per-prefab
4. Be able to adjust size-related information for a group of prefabs, rather than per-prefab