Fix scene midpoint detection.
MaterialPreviewRenderer: always set depthmask=true, this fixes a visibility problem with some transparent materials.
Further simplify code to compute scene bounds.
Merge pull request #4 from diiigle/Leap

Leap
#Fix Scale in TimeSlider

switched to an adapting scale
Merge branch 'master' of https://github.com/acgessler/open3mod
+Add dirty flat to OrbitCamera

to save matrix multiplications
#Fix Splitter Bug causing overlapping viewports

Cleanup Splitter and Viewport Bounds Infrastructure
#Fix default position of separators
Add ICameraController.SetPivot() and implement it for OrbitCameraController s.t. the scene orbits around the geometric center of the scene.
Merge branch 'master' of github.com:acgessler/open3mod
OrbitCameraController: SetPivot() now uses dirty flag.
Comment test code.
Updated to latest assimp-net version.
Improve logging formatting.
Heuristically ignore all-black diffuse material color on textured surfaces.
First draft of pivoting feature.
OrbitCameraController: revert pitch for mouse input to fix weird pitching.
Further work on pivoting feature, it now takes the center of the selected node.
Fix pivot computation.