Using Render Textures To Create a Cubemap

Unity Engine
1

I want to use a render texture that I have created in a script as a cube map. It follows the horizontal format where each side is lined up all on the same level. The sides go X+, X-, Y+, Y-, Z+, Z-. However I can’t assign this to my material that is using a cube map. I get the error that really doesn’t make sense to me:

RenderTexture.Create failed: cube maps must be power of two and width must match height

If I export my rendered cubemap and then re-import it as a normal texture and do the cube map setup it does work as intended. However I don’t want to do it this way because the conversion from render texture to Texture2D takes a very long time and I want this cubemap to be dynamic and capable of changing within a short amount of time.

What would be the best way of going about this?

2

bump

3

Sounds like you’re generating the faces manually. The simplest method to do this is to make a new rendertexture with power of 2 width and height, then add myrendertexture.isPowerOf2 = true;
myrendertexture.isCubemap = true;
mycamera.RenderToCubemap (myrendertexture);
myrendertexture.Create();
No need to even touch Texture2D and it’s fast enough to do in real time.

4

Just curious: couldn’t you just use a reflection probe for that and update it as often as you want?