Loading Large Models - Unity 5 Occlusion Culling?

July 21, 2015 - 3:11am #1

Hello my name is Michael,

Firstly, I must apologise if this has been answered elsewhere, I have looked around and not found an answer to this that works. Anyway, I am making a project in Unity 5 with Vuforia 4, the project requires very large models to be rendered on a tablet, that the person holding the tablet can then walk around. The models are very detailed and so, in turn, are very difficult for the tablet to load.

My first thoughts on how to fix this were to use Unity 5's Occlusion Culling technique, which works to a point. If the tablet is zoomed in on the model (in this case, a car) then everything outside of the camera is not loaded and so the tablet runs fine. However, if the tablet zooms out of the model, the tablet can't take it. Due to the size of the model, the tablet lags etc. Now, I have put into play Occlusion Culling with the hope that the outsides of the model will block the insides of the model and so prevent them from being loaded. For instance, the chassis of the car preventing the seats, steering wheel, engine etc from being loaded. Unfortunately, it seems that no matter what I do with the occlusion culling, it will not work like this. I believe it is supposed to (according to the Unity documentation and what else I have read, it is). I assumed that it is something to do with my smallest occluder in the Unity Occlusion window, alas I cannot make it smaller than 2 as the model refuses to bake if I do.

To give an example of the amount of data etc the tablet has to load with just the model car on scene its 1.7m Tris and 1.2m Verts. Nothing can be done to reduce model size, it has to be these models.

Thanks in advance for any help.

Have fun


Loading Large Models - Unity 5 Occlusion Culling?

January 31, 2017 - 10:21am #3

Hi Michael, right now I'm trying to load large models, and I have the same problem that you had. I would like to know if you have found how to do it.

I have seen that are many options, like multiple image targets for simple models, or "Extended Tracking".

I hope not to bother you with my question.

Best Regards



Loading Large Models - Unity 5 Occlusion Culling?

August 17, 2015 - 11:57pm #2

In case anyone was wondering, I never managed to get the Occlusion Culling working, still don't know why. Instead I have selected the interior objects of the car and given them a rule to have their renderer and collision box disabled, unless the camera is inside the car (via use of a trigger box). 


Would still have preferred the Occlusion Culling as the method I used above doesn't work well enough, I managed to get it to change from 1.7m tris to 1.2m and 1.2m verts to 1m. Alas, that is not enough.

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