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How to extract all 6 faces out of cubemap .hdr?

My goal is to take a panorama snapshot out of my 3d scene, map this as a "skybox". The end result should be an application like this:


I placed a SceneCaptureCube into my 3d scene and attached a CubeRenderTarget as texture target to get a panoramic snapshot. Then I exported the render target as .hdr. Then in my panaroma scene I added a box with inverted face normals and assigned a material, which renders the cube map.

On Windows everything works perfect. But deploying this application to Android caused artifacts, because my android device doesnt support 32 bit hdr textures and clamps it to 16 bit. I tried HTML5 deployment and get even more troubles with memory and artifacts too.

My idea is to create a simple scene, again with a cube with inverted faces. But instead mapping a cube map on it, I want to map 6 simple 2d textures on each side of the cube to simulate a panorama such in the ikea example.

My question here is, how to extract or transform each face out of the cubemap .hdr? In the documenation only the other way round is explained, meaining how to create a cubemap out of 6 faces with the nvidia tool and photoshop.

Thx in advance!


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asked Mar 19 '15 at 05:42 PM in Using UE4

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try to open the hdr map previously saved to dds using photoshop. My plugin nvidia automatically picks up and divides the map into squares.

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answered Dec 05 '17 at 01:19 PM

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