Make Render Texture reflect Terrain only ?

Unity Engine
1

Hi.
In my scene there are many objects. I make a mirror from Render Texture. It’s possible to make it reflect the terrain only ?

2

Use a layer.

Give the terrain its own layer, then set the reflection camera to only see the terrain layer by setting its culling mask.

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3

Good. One more question.
Does this method of reflection cost more frame rate ? Will this effect the game speed ?

4

Does using layers and a culling mask make a camera render slower? No. It’ll be faster to render only the terrain vs rendering everything in the reflection.

How much faster? Depends on a lot of factors (like how much other stuff is in your scene, and where your bottlenecks are for performance). Potentially a lot, also potentially you’ll see almost no difference in frame rate.

1 Like
5

Thank you so much Bgolus.

6

Ben, or someone else, what can i do to change on the fly what to render (via a camera into a render target).

  1. can i reasonably assume setting layer masks n times every frame (from their normal masks, to some special mask i need for this 1 camera, then back to their previous masks again) is fast?

  2. any other way how to tell (via a command buffer, perhaps?) which objects to render on a camera?

  3. AFAIU the amount of layer masks is limited ?

  4. and there are special rules for how many can be disabled on deffered rendering?

thanks for any help or pointers to documentation / articles / examples