Allow configurable block sizes, merging children with different resolutions.
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels
Use back face culling on the heightfields.
Provide for custom expansion according to attribute, tweak spanner attribute.
Compute heightfield normals from adjacent values in vertex shader.
Merge branch 'master' of https://github.com/highfidelity/hifi into metavoxels
Merge pull request #3256 from ey6es/metavoxels

Allow configurable block sizes, use back face culling for heightfields, custom expansion for spanner attributes, compute normals in vertex shader.