Points are drawn as half octahedron (aligned to the camera).
Getting the appropriate matrix for facing the camera would fail in in
orthographic view, points were not facing the camera (revealing their
missing other half octahedron)
Maniphest Tasks: T87150
Differential Revision: https://developer.blender.org/D10923
Also includes outline overlays. Removes the temp overlay drawing
We make the geometry follow camera like billboards this uses less
geometry. Currently we use half octahedron for now. Goal would be
to use icospheres.
This patch also optimize the case when pointcloud has uniform radius.
However we should premultiply the radius prop by the default radius
beforehand to avoid a multiplication on CPU.
Using geometry instead of pseudo raytraced spheres is more scalable as
we can render as low as 1 or 2 triangle to a full half sphere and can
integrate easily in the render pipeline using a low amount of code.
Reviewed By: brecht
Differential Revision: https://developer.blender.org/D8301
