Issue with RenderTexture, GetTemporary and MipMap

Hi there,

I am using Unity 5.3.4f1 and trying to generate a RenderTexture with mips. For performance reasons, I am using RenderTexture.GetTemporary to generate my RenderTexture.

I would like to generate mips for this RenderTexture that's why I am scaling it to have a power-of-two size. Unfortunately, I can't use renderTexture.useMipMap or renderTexture.generateMips without having those errors :

The funny thing is that the mips are available but the errors flood the console.
I don't want to use a predefined RenderTexture as GetTemporary gives better performances.

It seems that this has been already reported but not really fixed : https://issuetracker.unity3d.com/is...-on-rendertexture-dot-gettemporary-in-5-dot-2

Is there a way to generate mips for temporary RenderTexture without generating an error ?
Thank you !

 

Anybody ?

 

Still nobody...

 

You have to enable mipmaps before you call RenderTexture.Create() like this:

Code (CSharp):

1. rt = new RenderTexture(resolution.x, resolution.y, 0, format, RenderTextureReadWrite.Linear);
2. rt.name = name;
3. rt.useMipMap = true;
4. rt.Create();

Nathaniel

 

Still nothing on this? @eagle555 correct, but the error comes when using RenderTexture.GetTemporary. The texture is already created in an internal pool and re-setting the mipmaps is not allowed.

 

Then don't use the internal pool but create one yourself

 

if you want to use mipmaps, you need to make sure that the texture is not created in video memory, and if created, release, assign the use of mipmaps and create. When I do this, it doesn't seem to have a huge impact on performance in my experience.

I use code like this:

Code (CSharp):

1. var texture = RenderTexture.GetTemporary(width, height, 0, RenderTextureFormat.ARGB32);
2. if (useMipMaps)
3. {
4.     if (texture.IsCreated())
5.     {
6.         texture.Release();
7.     }
8.     texture.useMipMap = true;
9.     texture.filterMode = FilterMode.Trilinear;
10.     texture.anisoLevel = 9;
11. }
12. if (!texture.IsCreated())
13. {
14.     texture.Create();
15. }
16.  

 

Cool didn't know that was possible. I was looking for manipulating the builtin Gbuffer textures with a ComputeShader and this makes that possible