Some progress shots of work I’m doing for a client. Using low-resolution (8k * 4K > 1K) maps for now just to test the material Shader, which is where all the magic happens. All the Atmospheric stuff such as colour, density, etc. can be tweaked in real-time so you can completely change the look without having to swap out textures or using any texture lookups at all.
The final surface texture will have a 65,536 Pixel-Resolution around the equator, and be completely seamless. I’m doing by splitting the globe into identical chunks, re-baking textures based on projection in Maya and having 4 UV-layers on each chunk for different resolutions/global mapping and various other things. I’d also like to split up the BRDF-styles for each section too, using Minneart for the clouds, Oren-Nayar for the Topography and perhaps just default for the oceans. Very tempted to write a paper on when I’m done, as some of what I’m doing hasn’t been mentioned anywhere before that I know of and is a combination of loads of techniques (Can’t reveal the secrets yet!) Here’s the progress I’ve made so far (click images for High Res).
Massive shout-out to Everett Gunther for showing me a great way to generate cloud-shadows on the surface, and also a good starting point for the atmosphere . I’m likely going to switch to the method proposed by Sean O’Neil at a later date once I get some help translating the math, and also try to incorporate JBaldwins awesome eclipse shader. (If he’d be so kind as to help me figure out how to do all the offsets in the Material ;))
!!! That’s insane !!! Where can I get images with that level of detail?? (without having to purchase my own satellite?)
Is going to be an interactive globe, or just animated through matinee? Looks great so far! Sounds like quite the project, good luck man!
You can get the images directly from NASA, the ones they give you are a massive 86,400 * 46,200 in size, so even I’m down scaling them :p. Search “Blue Marble” on Google
Only downside, you need some serious RAM to work with textures that size in Photoshop!
I’ve added yet more parameters and proper night/day masking now. I’d like to re-create a Gradient mapping tool like Photoshops in the Material Editor to make the atmosphere colour bands more interesting. I’ve seen it done in HLSL, but the Custom node doesn’t work in UE4 at the moment
Thought I’d better post an update! Several months of trial and error and ridiculous amounts of texture re-projections later, I’m getting there! (Sorry about the JPEG quality :()
I doubt it now that he has a GTX 980, only 8ms for that scene, that’s very impressive. I want one!
Looking really good man! Looks pretty realistic, the clouds have a good depth to them, they look separate from the ground image (really ‘3D’ if you will), adds a lot to the scene. Nice work!
Thanks Once the cloud-shadowing and detailing is back in it should look ever better
As for performance, I WAS noticing spikes when streaming in the textures (lots of things being dumped in and out of GPU memory each frame). Since then I’ve turned off the Mip-Maps (no aliasing artefacts yet) and the performance remains a solid 120 FPS wherever I am in the scene! Still more to do:
Why thanks I’m using Gravity as my inspiration, still a fair old bit of work to do! There will most certainly be a video at some stage, but when it’s finished
That’s exactly the video I’m using as source My Seams have returned thanks to Mental Rays’ bleddy border that it adds to everything so I’m back to re-baking textures, but I am also working on the aurora:
What I’m struggling with now is mapping the detail textures to 3D space, but making sure there’s no stretching or re-orientation. The 3D World Coordinates functions in Unreal are okay for small objects, but for large objects they cause all manner of stretching. I may just have to create another set of UV’s and have each mesh in the actor have a chunk of those UV’s, and actually map the textures to UV space. There would still be some distortion at the poles (or I could use Polar Coordinates, not yet figured that one out but I see it in your sun shader).
Looking forward to getting me a copy of that and learning a few tricks
