• Products
  • Solutions
  • Made with Unity
  • Learning
  • Support & Services
  • Community
  • Asset Store
  • Get Unity

UNITY ACCOUNT

You need a Unity Account to shop in the Online and Asset Stores, participate in the Unity Community and manage your license portfolio. Login Create account
  • Blog
  • Forums
  • Answers
  • Evangelists
  • User Groups
  • Beta Program
  • Advisory Panel

Navigation

  • Home
  • Products
  • Solutions
  • Made with Unity
  • Learning
  • Support & Services
  • Community
    • Blog
    • Forums
    • Answers
    • Evangelists
    • User Groups
    • Beta Program
    • Advisory Panel

Unity account

You need a Unity Account to shop in the Online and Asset Stores, participate in the Unity Community and manage your license portfolio. Login Create account

Language

  • Chinese
  • Spanish
  • Japanese
  • Korean
  • Portuguese
  • Ask a question
  • Spaces
    • Default
    • Help Room
    • META
    • Moderators
    • Topics
    • Questions
    • Users
    • Badges
  • Home /
avatar image
1
Question by Hoeloe · Jun 30, 2017 at 11:22 PM · camerarendertexturemaskdepthdepth-buffer

Culling Mask with Depth Occlusion

So, I've got a system set up. I want to apply a post process effect only to specific objects in the scene. The way I have achieved this is by setting up a second camera, using the Culling Mask setting to render only those objects I want to have this effect. I'm then applying this rendered texture as a post-process overlay on the main camera.

This works, but it has an issue - the Culling Masks don't account for the depth of other objects in the scene, which means that this post process effect is applied even when the objects are occluded by the scene. Obviously for what I'm trying to do, this is unwanted, but I can't seem to work out how to use the render texture from a different camera when rendering this scene, or at the very least how to apply the occlusion from the other camera.

I've tried many different methods, such as using stencil buffers, but I can't seem to get anything to work.

Is there a way I can do this so the effect will be applied only to the visible objects in the scene, rather than all of them?

Comment
Add comment
10 |3000 characters needed characters left characters exceeded
▼
  • Viewable by all users
  • Viewable by moderators
  • Viewable by moderators and the original poster
  • Advanced visibility
Viewable by all users

1 Reply

· Add your reply
  • Sort: 
avatar image
1

Answer by Hoeloe · Jul 01, 2017 at 01:26 PM

Okay, so I've done some working around this to make this work.

The first thing I did was use a third camera. This camera has the same settings as my second camera, but with the culling mask reversed - that is, it's set to render everything BUT the objects I want.

Secondly, I applied a replacement shader on my second camera, which would render everything blank white, with no shading or lighting.

Next, I set the third camera to render to the render texture, and render the scene to it (NOTE: this step I would LIKE to be able to avoid if possible, because it does mean rendering the scene twice.)

Then, I clear the render texture using GL.Clear, clearing the colour buffer to black, and leaving the depth buffer intact.

Finally, I render the second camera with its replacement shader. These objects are now writing white pixels onto a solid black colour buffer, but the depth buffer still contains the necessary information.

Now, I have a render texture that contains white pixels where I want the post-process effect to occur, and black pixels elsewhere, which I can use to mask the effect.

This works flawlessly, but it DOES require rendering the entire scene twice. I'm looking into ways I could potentially use the result from the main camera to copy to the second one.

Comment
Add comment · Show 1 · Share
10 |3000 characters needed characters left characters exceeded
▼
  • Viewable by all users
  • Viewable by moderators
  • Viewable by moderators and the original poster
  • Advanced visibility
Viewable by all users
avatar image FrenchToastFella · Sep 28, 2017 at 09:04 PM 0
Share

Did you make any progress on this? I'm trying to do the same thing (but honestly I just need the render texture).

Your answer

Hint: You can notify a user about this post by typing @username

Up to 2 attachments (including images) can be used with a maximum of 524.3 kB each and 1.0 MB total.

Welcome to Unity Answers

The best place to ask and answer questions about development with Unity.

To help users navigate the site we have posted a site navigation guide.

If you are a new user to Unity Answers, check out our FAQ for more information.

Make sure to check out our Knowledge Base for commonly asked Unity questions.

If you are a moderator, see our Moderator Guidelines page.

We are making improvements to UA, see the list of changes.



Follow this Question

Answers Answers and Comments

103 People are following this question.

avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image

Related Questions

How to get the depth values of the camera view? 1 Answer

Scene View Camera Depth Texture? 0 Answers

How can I take depth into account when rendering to texture? 2 Answers

RenderTexture behaviour inconsistent to Cameras, Rendering two times to a RenderTexture respecting depth, Rendering object visibility 0 Answers

Is there a way to write to Deferred Depth from a command buffer in CameraEvent.AfterImageEffects? 1 Answer

  • Anonymous
  • Sign in
  • Create
  • Ask a question
  • Spaces
  • Default
  • Help Room
  • META
  • Moderators
  • Explore
  • Topics
  • Questions
  • Users
  • Badges