Occlusion culling just not working.

So, I am sure it does work. I am sure I am doing something wrong or skipping one step. I just cannot make it work. The only elements that get "hidden" are those outside the camera point of view. However, elements do not disappear when they are behind other elements. I created a new scene to test it and I am getting the same result.


These are the steps I followed:

1. Create a new scene.
2. Added the two elements.
3. Create a material, made it opaque and added to the elements.
4. Select the elements and tagged then as Occluder Static and occludee static.
5. On the window Occlusion selected Occluder and Occludee in the Object tab for both elements.
6. Select the elements.
7. Bake them.

It is supposed the start working for such a simple scene, but it is not. Any ideas on what I am doing wrong?

 

Do you find the solution for that?

 

No mate. I had to put this project aside. But I did look hard and could not find what was the problem. Are you facing exactly the same issue?

 

I'm facing the same, and the moderators deleted my comment when I posted it. They also ignore all the numerous threads showing this issue with concrete example.

 

check out my signature

 

BUMP
I have Same Problem. Any comments from devs?

 

same Problem here. It just doesn't work

 

Here is one thing: if you have dynamic/static batching and/or GPU instancing enabled this can happen because the meshes get batched (so they effectively become one mesh) and therefore are not culled.

 

...and here's another thing: frustum culling uses OBB (oriented bounding box) to check if the object is inside the frustum but occlusion culling uses BB (not oriented volumes!), so depending on how your camera and objects are rotated it may think that one thing is in front of the other!

You can understand/see this happening by enabling Camera Volumes and Visibility Lines and rotate all your objects together, notice that as they move the camera volumes do not rotate together and things get weird (things that are further away from the camera gets inside of a camera volume that is nearer the camera).

Not sure if this - or a similar problem - is what's happening in the OP example, though.

 

any solution for this? i have that same issue... loaded a new scene... add a bunch of cubes, then put a bigger cube in front of the camera, flag all cubes as occlusion static and bake occlusion... on visualization, all cubes are being rendered... even the ones behind the big cube in front of the camera...

 

same problem

 

The solution is, your camera needs to be within the 'bounding box' of the occlusion culling bake, it is a voxel based system, and it won't create many voxels far away from the geometry if there is no geometry there (for example where the camera is.

The 'smallest occluder size' value in the bake settings for Occlusion is also, this is the size of the smallest thing that will occlude, try setting the value to '1' or lower and work your way back up to a value that suits you.

Try bringing your camera within the baked occlusion region while in play mode (you will see a yellow square) this is also visualised as blue squares when you are in edit Occlusion mode

 

This gif may help to show better, OP's visualize scene view mode does not show the yellow boundary for occlusion because their camera is not within the occlusion zone. Try bringing your camera near to the occlusion area or put some static geometry to be baked with occlusion near to it to make the zone larger!

The 'smallest occluder size' value in the bake settings for Occlusion is also, this is the size of the smallest thing that will occlude, try setting the value to '1' or lower and work your way back up to a value that suits you.

 

To add on that, you basically need to be in the area that unity makes when you bake, if you want the area to be bigger you can add more objects or do that the right way with 'occlusion area'

for more you can check this video for more information

 

I know this is an old topic but how do you increase the range of that yellow box?

 

You edit the occlusion region itself to do that, should be on the component

 

Can you do a screengrab? Are you talking about on the camera? Component where?

 

https://docs.unity3d.com/Manual/class-OcclusionArea.html

 

You can also put other object on the sides, the size of the yellow box is the min size for all of your object to fit into

 

Not referring to the Occlusion Area. I know how that works. Im talking about the yellow box you mentioned in pervious post. The distance of that hit box is too far away.

 

When the yellow box his the mesh, the objects on the other side disappear but I'm trying to find a way to extend that because the meshes are rendering too far away.

 

I had this issue and the solution for me was to apply a default material to the occluder mesh before baking. You can apply whatever material afterwards.

 

Just based on OP's GIF I think the problem OP had was simply that the camera was outside any camera volumes.
When baking, Unity tries to infer locations where the camera could reasonably be located, but in this example scene with no floor, and no walls and just infinite limbo, Unity seems to only compute camera volumes that are 1 occlusion size away from occluders or occludees. If the camera is then just outside of any camera volume, occlusion culling just doesn't happen.

If you want to test occlusion culling, I recommend giving it at least a plane representing a floor, and making it a static occluder.

That said, even making sure the camera is within a camera volume, occlusion culling still behaves very weirdly for me.
Changing the material did not help.

It looks like it actually finds holes in the mesh of a simple cube (note that I took this screenshot before I added a floor, but you can see the camera is inside a camera volume):


Changing the baking parameters (smallest occluder, smallest hole) does have an effect on it, but it seems kinda random. At one point 5 and 0.1 worked perfectly. Then I try moving an occluder just a little bit before baking and suddenly those same parameters result in holes and I need to set it to 2 and 0.5 to work...

And sometimes it looks like clicking "Bake" just doesn't do anything at all and occlusion data is not actually updated.