Arrangement of cubemap faces from RenderToCubemap

Questions & Answers
1

Hi everyone,

I’m trying to render a cubemap with Camera.RenderToCubemap, but I’m running into an issue. The faces of the resulting cubemap don’t seem to be in the right place (see the screenshot below).

109089-weird-cubemap.png
109089-weird-cubemap.png690×508 76 KB

Everything seems to be upside down and the sky/ground are swapped.

I’m rendering the cubemap like this:

using UnityEngine;

public class RenderTest : MonoBehaviour {

    public Camera CameraToUse;
    public RenderTexture CubemapTarget;

    public void Update()
    {
        if (Input.GetKeyDown(KeyCode.R)) Test();
    }

    public void Test()
    {
        if (!CubemapTarget)
        {
            RenderTextureDescriptor desc = new RenderTextureDescriptor();
            desc.autoGenerateMips = false;
            desc.bindMS = false;
            desc.colorFormat = RenderTextureFormat.ARGB32;
            desc.depthBufferBits = 24;
            desc.dimension = UnityEngine.Rendering.TextureDimension.Cube;
            desc.enableRandomWrite = false;
            desc.volumeDepth = 1;
            desc.msaaSamples = 8;
            desc.sRGB = true;

            desc.dimension = UnityEngine.Rendering.TextureDimension.Cube;
            desc.width = 512;
            desc.height = 512;

            CubemapTarget = new RenderTexture(desc);
        }

        CameraToUse.RenderToCubemap(CubemapTarget);
    }
}
2

I’ve got the same issue when I created a cubemap with RenderTextureDescriptor.
But it works fine when you create it like that:

cubeMapRT = new RenderTexture(width, height, depth,  RenderTextureFormat.ARGB32);
cubeMapRT.dimension = TextureDimension.Cube;
3

@andrei_kushner You star, thank you for reporting that here.

I’ve reproduced this issue and reported it to Unity. I’ve made the repro available here https://github.com/Bouncyrock/potential-cubemap-descriptor-bug showing the working and failing case. I’ll link the unity bug here once it’s confirmed by them.