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Smoother and terrain-aware camera

robojumper requested to merge camera_improvements into master

Closes #40 (closed). Closes #29 (closed).

This doesn't fix looking into the terrain 100%, as it only casts a single ray -- you can still get a glimpse into the terrain by positioning the camera so that the near plane clips the obstruction away. Two options are

  • Enhance the ray casting code to allow rays with a "radius"
  • Cast four rays to the four corners of the frustrum where it intersects with the near plane, then take the min.

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