How can I exclude certain objects from being black and white?

Development Rendering
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1

I am using a Post Process to make my level almost black and white, and I need certain things like my widgets or some meshes to be not affected by that but be in full color.

IMPORTANT NOTE: Links to tutorials about how to make objects visible through walls using custom depth are useless for this particular problem, I managed to make objects ignore Post Process using this method but turns out they can not be stopped from being visible through walls.

So can this thing actually happen?

UPDATE: Turns out the custom depth enabled objects STILL can be seen through walls, just very slightly unless a light hits them, then they go full on. Still looking for a solution.

FINAL UPDATE: If we activate custom depth to all the objects involved, the see-through effect stops. So now they all are depth-enabled, the colored objects have a value of 2, and the ones I want black and white 0.

2

  1. Set Custom Depth Stencil Pass to
    Enabled with Stencil in project settings.

  2. Set custom stencil value to 2 (just
    as an example) for objects that
    shouldn’t be affected by the post
    process.

325107-pp.png
325107-pp.png823×499 72.2 KB

3

Also, I’m pretty sure those tutorials are valid. The only difference is that you shouldn’t disable depth test in the material.

4

I found that my Material is different than yours. I am fixing it now. Can you please tell me what should I put where it says post-process effect? And “If” hooks where?

5

You plug the code that achieves the black and white look in Post process effect. If node is connected to Emissive input in the post process material.

6

325108-sten.jpg
325108-sten.jpg1920×1080 127 KB

Ok, I have this now, everything is black and white but the building I set as “2” is also black and white. I am close, but what am I doing wrong?

7

Can you see the building with custom stencil preview enabled?

325120-custom.png
325120-custom.png1911×556 34.1 KB

8

This should work

325128-depthtest.png
325128-depthtest.png1110×632 126 KB

9

No, everything is black :frowning:

10

Success! I had just “Enabled” in project settings, not “Enabled with stencil”. Testing now.

11

I can confirm Objects do not show through walls now, and the effect of colored objects in black and white world works perfectly! Thank you very much!

12

325109-sten2.jpg
325109-sten2.jpg1920×1080 140 KB

Any idea why I can’t control the amount of desaturation this way?

13

You need to use a component mask RGB for postprocessinput0

14

That stops the effect of colored building in desaturated world. So confusing!

15

Got it! The mask should be RGB, not just R!