# SetRenderTarget problem
**URL:** https://discussions.unity.com/t/setrendertarget-problem/657059
**Category:** Shaders & Materials
**Tags:** Shaders
**Created:** [March 2, 2017, 5:05pm UTC](https://discussions.unity.com/t/setrendertarget-problem/657059 "2017-03-02T17:05:37Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@SubPixelPerfect](https://discussions.unity.com/u/SubPixelPerfect)
#### Post date: [March 2, 2017, 5:05pm UTC](https://discussions.unity.com/t/setrendertarget-problem/657059/1 "2017-03-02T17:05:37Z")
Hi, I’m working on a post effect
and for that i need to render set of meshes to texture with ZTest LEqual to create a mask
here is a sphere rendered to separate texture
so i’m creating new RenderTexture and setting it as active color buffer while leaving depth buffer unchanged
rendering what i need and resetting render target
and everything works perfect
but when i’m enabling Direct3D in player settings and enabling anti-aliasing in quality settings
i’m getting an error:
> [@](#):
>
> ArgumentException: Graphics.SetRenderTarget called with depth RenderBuffer from screen and color RenderBuffer from RenderTexture
> UnityEngine.Graphics.SetRenderTargetImpl (RenderBuffer colorBuffer, RenderBuffer depthBuffer, Int32 mipLevel, CubemapFace face, Int32 depthSlice) (at C:/buildslave/unity/build/Runtime/Export/Graphics.cs:189)
> UnityEngine.Graphics.SetRenderTarget (RenderBuffer colorBuffer, RenderBuffer depthBuffer) (at C:/buildslave/unity/build/Runtime/Export/Graphics.cs:225)
here is my code:
```csharp
void OnRenderImageTest0(RenderTexture source, RenderTexture destination){
// create new render target
RenderTexture rt = RenderTexture.GetTemporary(_camera.pixelWidth, _camera.pixelHeight);
rt.Create();
RenderBuffer tmp = Graphics.activeColorBuffer;
// change render target
Graphics.SetRenderTarget(rt.colorBuffer, Graphics.activeDepthBuffer);
...
// render meshes
...
// reset render target
Graphics.SetRenderTarget(tmp, Graphics.activeDepthBuffer);
rt.Release();
}
```
is it a bug or i’m doing something wrong?
is there any way to do that on Direct3D with enabled anti-aliasing?
---
### Author:  [@SubPixelPerfect](https://discussions.unity.com/u/SubPixelPerfect)
#### Post date: [March 2, 2017, 9:31pm UTC](https://discussions.unity.com/t/setrendertarget-problem/657059/2 "2017-03-02T21:31:31Z")
[here](http://stackoverflow.com/questions/19023273/why-do-i-need-depthbuffer-to-use-rendertexture) i’ve found that
> [@](#):
>
> in D3D10 you cannot share a depth surface between render targets of different sizes.
But in my case size is equal.
unity documentation says:
> **[Unity - Manual: Cameras and depth textures](https://docs.unity3d.com/Manual/SL-CameraDepthTexture.html)**
> [@](#):
>
> When implementing complex Shaders or Image Effects, keep [Rendering Differences Between Platforms](https://docs.unity3d.com/Manual/SL-PlatformDifferences.html) in mind. In particular, using depth texture in an Image Effect often needs special handling on Direct3D + Anti-Aliasing.
>
> In some cases, the depth texture might come directly from the native Z buffer. If you see artifacts in your depth texture, make sure that the shaders that use it do not write into the Z buffer (use [ZWrite Off](https://docs.unity3d.com/Manual/SL-CullAndDepth.html)).
ok, I have ZWrite Off
more from docs:
> **[Unity - Manual: Writing shaders for different graphics APIs](https://docs.unity3d.com/Manual/SL-PlatformDifferences.html)**
> [@](#):
>
> Vertical Texture coordinate conventions differ between two types of platforms: Direct3D-like and OpenGL-like.
> …
> When you use [Image Effects](https://docs.unity3d.com/Manual/WritingImageEffects.html) and anti-aliasing, the resulting source Texture for an Image Effect is not flipped to match the OpenGL-like platform convention. In this case, Unity renders to the screen to get anti-aliasing and then resolves rendering into a Render Texture for further processing with an Image Effect.
> …
> …
> …
> Depth (Z) direction differs on different Shader platforms.
> …
> If you are fetching the depth (Z) buffer value manually, you might want to check the buffer direction.
this is clear, but what i can do in my case?