todo.txt

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// Build
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- Move VS project files into a VS directory to keep root dir clean
- Update Makefile to work now that I moved everything around again

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// Editor
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- Render UI when 3D object is clicked

Objects
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- Place lights
- Render light boundaries (position spheres; direction rays/cones)
- Better translation / object placement
- Snap to grid
- Snap to object (per-object type, relative "snap points")
- Directly edit properties (textbox)
- Rotate around arbitrary point

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// Engine
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Animation
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- Global translate, rotate
- Change texture (instant, fade?)
- Change mesh
- Change type-specific "properties" (e.g. toggle light on/off)
- Global scale?

Collision
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- Ellipsoid
- Scene graph (kd-tree, BSP?)
- Frustum culling
- BVH
- Mesh

Foliage
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- Billboard ground foliage (e.g. 2-plane grass) normal should point straight
    up for proper lighting calculations. /watch?v=BJDQNjlEO0I

Input
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- Better mouse smoothing / accuracy?
    "The Witness needs Raw Input to get good low-level relative mouse movements"
    https://mollyrocket.com/casey/stream_0007.html

Lighting
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- Light objects (OBJ_LIGHT)
- Multiple lights (how to differentiate types in shader?)
- Shadows

Shaders
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- Refactor program_bind() / program_uniform_set() out of object_render()