Run in streaming into game engines (Unity, Unreal)

[fpibbs]

The idea is to stream earth data into game engines. As a background for deeper analysis or whatever useful. I mind if anyone has tried to start the process.

[retroplasma]

Probably looking at the code from the client can help put something together. I assume those engines have features to deal with octrees, frustum culling, HTTP and so on. Here's an overview of the files from the client:

• main.cpp: Render loop, deals with the octree, requests new bulks/nodes, does culling, camera movement, decides which meshes are buffered. Calls functions from the other files
• rocktree_util.h: Requests data from the servers and calls decoding functions
• rocktree_http.h: HTTP. Caches some requests. The HTTP cache headers and the browser do the work in the Emscripten case. I think everything is cached for some time aside from the root meta Planetoid.
• rocktree.proto, rocktree_decoder.h, rocktree_ex.h: Decode raw data. First protobuf, then postprocessing, then putting it in a form so it fits our octree data type and can be rendered
• rocktree_types.h: Octree data structure with meshes, textures, matrices and download state. Grows/shrinks based on camera position. Instantiated in main
• rocktree_math.h: Math functions for frustum culling and camera
• rocktree_gl.h: Graphics binding. The interesting part here is the octant masking. The meshes can be sub-divided with these masks and help with level of detail. This mask binding can be improved by packing it into a smaller uniform value and unpacking it in the shader.

The crucial part is the decoding of the meshes. Everything else depends on how exhaustive and optimized it should be.